./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci01-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/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_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci01-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/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_f1ae1ce1-6d92-439d-8313-4a6e947003e4/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 6b0570f2e0d80d68bc280040cce27f654b3fe7a2c0bad30f9bb811af9ca3d994 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 13:39:56,721 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 13:39:56,725 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 13:39:56,787 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 13:39:56,788 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 13:39:56,793 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 13:39:56,795 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 13:39:56,800 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 13:39:56,803 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 13:39:56,813 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 13:39:56,814 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 13:39:56,817 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 13:39:56,817 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 13:39:56,821 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 13:39:56,823 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 13:39:56,830 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 13:39:56,837 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 13:39:56,839 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 13:39:56,842 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 13:39:56,850 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 13:39:56,853 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 13:39:56,855 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 13:39:56,859 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 13:39:56,861 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 13:39:56,874 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 13:39:56,876 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 13:39:56,877 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 13:39:56,880 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 13:39:56,881 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 13:39:56,882 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 13:39:56,883 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 13:39:56,883 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 13:39:56,884 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 13:39:56,885 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 13:39:56,887 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 13:39:56,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 13:39:56,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 13:39:56,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 13:39:56,888 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 13:39:56,889 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 13:39:56,890 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 13:39:56,891 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/config/svcomp-Overflow-32bit-Taipan_Default.epf [2021-11-19 13:39:56,925 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 13:39:56,925 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 13:39:56,926 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 13:39:56,927 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 13:39:56,927 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 13:39:56,927 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 13:39:56,927 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 13:39:56,928 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 13:39:56,928 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 13:39:56,928 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 13:39:56,929 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 13:39:56,929 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 13:39:56,929 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 13:39:56,929 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 13:39:56,930 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 13:39:56,930 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 13:39:56,931 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 13:39:56,931 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 13:39:56,931 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-19 13:39:56,932 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 13:39:56,932 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 13:39:56,932 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 13:39:56,933 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 13:39:56,933 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 13:39:56,933 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 13:39:56,933 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-19 13:39:56,934 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 13:39:56,934 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 13:39:56,934 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 13:39:56,935 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 13:39:56,935 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 13:39:56,935 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 13:39:56,935 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:39:56,936 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 13:39:56,936 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 13:39:56,936 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 13:39:56,937 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 13:39:56,937 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 13:39:56,937 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 13:39:56,937 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 13:39:56,938 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 13:39:56,938 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_f1ae1ce1-6d92-439d-8313-4a6e947003e4/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6b0570f2e0d80d68bc280040cce27f654b3fe7a2c0bad30f9bb811af9ca3d994 [2021-11-19 13:39:57,307 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 13:39:57,335 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 13:39:57,339 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 13:39:57,340 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 13:39:57,341 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 13:39:57,343 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/recursive/Fibonacci01-1.c [2021-11-19 13:39:57,447 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/data/c11b7de25/737cef38442746b499e6b242d77a627a/FLAG24b5c9cc1 [2021-11-19 13:39:57,977 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 13:39:57,978 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/sv-benchmarks/c/recursive/Fibonacci01-1.c [2021-11-19 13:39:57,992 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/data/c11b7de25/737cef38442746b499e6b242d77a627a/FLAG24b5c9cc1 [2021-11-19 13:39:58,345 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/data/c11b7de25/737cef38442746b499e6b242d77a627a [2021-11-19 13:39:58,350 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 13:39:58,352 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 13:39:58,354 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 13:39:58,354 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 13:39:58,369 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 13:39:58,370 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,371 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2383612d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58, skipping insertion in model container [2021-11-19 13:39:58,371 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,380 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 13:39:58,395 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 13:39:58,615 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_f1ae1ce1-6d92-439d-8313-4a6e947003e4/sv-benchmarks/c/recursive/Fibonacci01-1.c[804,817] [2021-11-19 13:39:58,617 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:39:58,637 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 13:39:58,662 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_f1ae1ce1-6d92-439d-8313-4a6e947003e4/sv-benchmarks/c/recursive/Fibonacci01-1.c[804,817] [2021-11-19 13:39:58,664 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:39:58,687 INFO L208 MainTranslator]: Completed translation [2021-11-19 13:39:58,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58 WrapperNode [2021-11-19 13:39:58,688 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 13:39:58,691 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 13:39:58,692 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 13:39:58,692 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 13:39:58,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,711 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,734 INFO L137 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 28 [2021-11-19 13:39:58,735 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 13:39:58,737 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 13:39:58,738 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 13:39:58,738 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 13:39:58,749 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,749 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,764 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,767 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,771 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,781 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,782 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,784 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 13:39:58,785 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 13:39:58,788 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 13:39:58,788 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 13:39:58,789 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (1/1) ... [2021-11-19 13:39:58,798 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:39:58,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:39:58,828 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 13:39:58,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 13:39:58,894 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-19 13:39:58,894 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-19 13:39:58,895 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 13:39:58,895 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 13:39:58,895 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 13:39:58,895 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 13:39:58,975 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 13:39:58,977 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 13:39:59,158 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 13:39:59,183 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 13:39:59,183 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-19 13:39:59,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:39:59 BoogieIcfgContainer [2021-11-19 13:39:59,187 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 13:39:59,189 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 13:39:59,189 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 13:39:59,193 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 13:39:59,193 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 01:39:58" (1/3) ... [2021-11-19 13:39:59,194 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41d97393 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:39:59, skipping insertion in model container [2021-11-19 13:39:59,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:39:58" (2/3) ... [2021-11-19 13:39:59,195 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41d97393 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:39:59, skipping insertion in model container [2021-11-19 13:39:59,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:39:59" (3/3) ... [2021-11-19 13:39:59,197 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2021-11-19 13:39:59,204 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 13:39:59,204 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2021-11-19 13:39:59,267 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 13:39:59,277 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 13:39:59,277 INFO L340 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2021-11-19 13:39:59,298 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-19 13:39:59,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-19 13:39:59,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:39:59,307 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:39:59,308 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:39:59,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:39:59,315 INFO L85 PathProgramCache]: Analyzing trace with hash 898045137, now seen corresponding path program 1 times [2021-11-19 13:39:59,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:39:59,328 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079453596] [2021-11-19 13:39:59,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:39:59,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:39:59,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:39:59,563 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 13:39:59,564 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:39:59,564 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079453596] [2021-11-19 13:39:59,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079453596] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:39:59,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:39:59,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 13:39:59,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123647489] [2021-11-19 13:39:59,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:39:59,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 13:39:59,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:39:59,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 13:39:59,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:39:59,648 INFO L87 Difference]: Start difference. First operand has 31 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:39:59,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:39:59,823 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2021-11-19 13:39:59,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 13:39:59,826 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-19 13:39:59,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:39:59,835 INFO L225 Difference]: With dead ends: 33 [2021-11-19 13:39:59,835 INFO L226 Difference]: Without dead ends: 26 [2021-11-19 13:39:59,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 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 13:39:59,844 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 38 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:39:59,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 28 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 13:39:59,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-19 13:39:59,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-19 13:39:59,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 21 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-19 13:39:59,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-11-19 13:39:59,908 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 7 [2021-11-19 13:39:59,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:39:59,909 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-11-19 13:39:59,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:39:59,909 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-11-19 13:39:59,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-19 13:39:59,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:39:59,911 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:39:59,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 13:39:59,912 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:39:59,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:39:59,914 INFO L85 PathProgramCache]: Analyzing trace with hash 2069595513, now seen corresponding path program 1 times [2021-11-19 13:39:59,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:39:59,914 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088122819] [2021-11-19 13:39:59,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:39:59,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:39:59,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:39:59,979 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 13:39:59,980 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:39:59,980 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088122819] [2021-11-19 13:39:59,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088122819] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:39:59,980 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:39:59,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 13:39:59,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139294289] [2021-11-19 13:39:59,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:39:59,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:39:59,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:39:59,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:39:59,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:39:59,984 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:40:00,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:00,012 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2021-11-19 13:40:00,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:40:00,013 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-19 13:40:00,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:00,016 INFO L225 Difference]: With dead ends: 28 [2021-11-19 13:40:00,016 INFO L226 Difference]: Without dead ends: 26 [2021-11-19 13:40:00,017 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 13:40:00,021 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 11 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 34 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 13:40:00,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 34 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 13:40:00,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-19 13:40:00,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2021-11-19 13:40:00,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-19 13:40:00,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-11-19 13:40:00,035 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 8 [2021-11-19 13:40:00,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:00,036 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-11-19 13:40:00,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 13:40:00,037 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-11-19 13:40:00,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-19 13:40:00,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:00,038 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:40:00,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 13:40:00,039 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:00,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:00,040 INFO L85 PathProgramCache]: Analyzing trace with hash 299865495, now seen corresponding path program 1 times [2021-11-19 13:40:00,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:00,041 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364850329] [2021-11-19 13:40:00,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:00,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:00,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:00,093 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 13:40:00,101 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:00,101 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364850329] [2021-11-19 13:40:00,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364850329] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:40:00,102 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:40:00,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:40:00,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442151052] [2021-11-19 13:40:00,103 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:40:00,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:40:00,104 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:00,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:40:00,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:40:00,105 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-19 13:40:00,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:00,128 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-11-19 13:40:00,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 13:40:00,130 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-19 13:40:00,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:00,131 INFO L225 Difference]: With dead ends: 24 [2021-11-19 13:40:00,131 INFO L226 Difference]: Without dead ends: 20 [2021-11-19 13:40:00,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:40:00,134 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 3 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:00,135 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 44 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 13:40:00,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-19 13:40:00,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-19 13:40:00,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-19 13:40:00,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-19 13:40:00,143 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 10 [2021-11-19 13:40:00,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:00,144 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-19 13:40:00,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-19 13:40:00,145 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-19 13:40:00,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-19 13:40:00,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:00,146 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 13:40:00,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 13:40:00,147 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:00,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:00,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1166742503, now seen corresponding path program 1 times [2021-11-19 13:40:00,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:00,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655335729] [2021-11-19 13:40:00,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:00,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:00,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:00,292 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 13:40:00,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:00,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655335729] [2021-11-19 13:40:00,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655335729] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:40:00,295 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:40:00,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 13:40:00,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140971033] [2021-11-19 13:40:00,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:40:00,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 13:40:00,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:00,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 13:40:00,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:40:00,300 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-19 13:40:00,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:00,401 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-19 13:40:00,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 13:40:00,402 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-19 13:40:00,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:00,404 INFO L225 Difference]: With dead ends: 36 [2021-11-19 13:40:00,404 INFO L226 Difference]: Without dead ends: 34 [2021-11-19 13:40:00,405 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 13:40:00,407 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:00,407 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 63 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 13:40:00,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-19 13:40:00,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2021-11-19 13:40:00,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-19 13:40:00,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-19 13:40:00,428 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 23 [2021-11-19 13:40:00,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:00,429 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-19 13:40:00,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-19 13:40:00,429 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-19 13:40:00,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-19 13:40:00,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:00,431 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 13:40:00,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-19 13:40:00,432 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:00,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:00,433 INFO L85 PathProgramCache]: Analyzing trace with hash 455941723, now seen corresponding path program 1 times [2021-11-19 13:40:00,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:00,434 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080735826] [2021-11-19 13:40:00,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:00,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:00,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:00,566 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 13:40:00,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:00,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080735826] [2021-11-19 13:40:00,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080735826] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:00,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903378334] [2021-11-19 13:40:00,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:00,572 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:00,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:00,580 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:00,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 13:40:00,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:00,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 13:40:00,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:00,964 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 13:40:00,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:01,239 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 13:40:01,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903378334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:01,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1903227350] [2021-11-19 13:40:01,262 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 13:40:01,263 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:01,269 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 13:40:01,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:01,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2021-11-19 13:40:01,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569124631] [2021-11-19 13:40:01,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:01,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 13:40:01,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:01,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 13:40:01,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-19 13:40:01,276 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-19 13:40:01,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:01,704 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2021-11-19 13:40:01,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 13:40:01,712 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 30 [2021-11-19 13:40:01,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:01,714 INFO L225 Difference]: With dead ends: 90 [2021-11-19 13:40:01,714 INFO L226 Difference]: Without dead ends: 64 [2021-11-19 13:40:01,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-11-19 13:40:01,719 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 113 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:01,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 67 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:40:01,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-19 13:40:01,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2021-11-19 13:40:01,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.105263157894737) internal successors, (42), 41 states have internal predecessors, (42), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-19 13:40:01,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-19 13:40:01,757 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 30 [2021-11-19 13:40:01,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:01,757 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-19 13:40:01,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-19 13:40:01,759 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-19 13:40:01,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-19 13:40:01,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:01,761 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:40:01,796 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-19 13:40:01,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:01,977 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:01,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:01,977 INFO L85 PathProgramCache]: Analyzing trace with hash 1228045225, now seen corresponding path program 2 times [2021-11-19 13:40:01,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:01,978 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853706658] [2021-11-19 13:40:01,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:01,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:01,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:02,071 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 13:40:02,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:02,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853706658] [2021-11-19 13:40:02,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853706658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:02,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380082008] [2021-11-19 13:40:02,073 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:40:02,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:02,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:02,074 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:02,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 13:40:02,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-19 13:40:02,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:02,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:40:02,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:02,241 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 13:40:02,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:02,325 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 13:40:02,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380082008] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:40:02,326 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 13:40:02,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 9 [2021-11-19 13:40:02,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356652436] [2021-11-19 13:40:02,327 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:40:02,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 13:40:02,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:02,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 13:40:02,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-19 13:40:02,328 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 13:40:02,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:02,377 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-11-19 13:40:02,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 13:40:02,378 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-11-19 13:40:02,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:02,380 INFO L225 Difference]: With dead ends: 60 [2021-11-19 13:40:02,381 INFO L226 Difference]: Without dead ends: 59 [2021-11-19 13:40:02,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 43 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 13:40:02,383 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 12 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:02,383 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 57 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 13:40:02,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-19 13:40:02,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-11-19 13:40:02,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 9 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-19 13:40:02,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-11-19 13:40:02,399 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 24 [2021-11-19 13:40:02,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:02,399 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-11-19 13:40:02,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 13:40:02,400 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-11-19 13:40:02,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-19 13:40:02,402 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:02,402 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, 1] [2021-11-19 13:40:02,432 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-19 13:40:02,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:02,613 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:02,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:02,613 INFO L85 PathProgramCache]: Analyzing trace with hash 569765849, now seen corresponding path program 1 times [2021-11-19 13:40:02,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:02,616 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851105356] [2021-11-19 13:40:02,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:02,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:02,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:02,720 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 13:40:02,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:02,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851105356] [2021-11-19 13:40:02,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851105356] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:02,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032960646] [2021-11-19 13:40:02,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:02,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:02,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:02,723 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:02,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 13:40:02,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:02,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:40:02,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:02,884 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 13:40:02,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:02,994 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 13:40:02,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032960646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:02,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [201335075] [2021-11-19 13:40:02,999 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:03,000 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:03,001 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 13:40:03,001 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:03,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2021-11-19 13:40:03,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989042379] [2021-11-19 13:40:03,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:03,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-19 13:40:03,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:03,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-19 13:40:03,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-19 13:40:03,007 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-19 13:40:03,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:03,123 INFO L93 Difference]: Finished difference Result 69 states and 93 transitions. [2021-11-19 13:40:03,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 13:40:03,124 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 31 [2021-11-19 13:40:03,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:03,131 INFO L225 Difference]: With dead ends: 69 [2021-11-19 13:40:03,132 INFO L226 Difference]: Without dead ends: 68 [2021-11-19 13:40:03,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-19 13:40:03,137 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 16 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:03,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 129 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 13:40:03,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-19 13:40:03,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-11-19 13:40:03,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 50 states have (on average 1.1) internal successors, (55), 51 states have internal predecessors, (55), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 12 states have call predecessors, (27), 7 states have call successors, (27) [2021-11-19 13:40:03,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2021-11-19 13:40:03,150 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 31 [2021-11-19 13:40:03,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:03,151 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2021-11-19 13:40:03,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-19 13:40:03,151 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2021-11-19 13:40:03,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-19 13:40:03,154 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:03,154 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:40:03,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:03,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-19 13:40:03,381 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:03,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:03,381 INFO L85 PathProgramCache]: Analyzing trace with hash 341035740, now seen corresponding path program 1 times [2021-11-19 13:40:03,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:03,382 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138902960] [2021-11-19 13:40:03,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:03,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:03,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:03,499 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-19 13:40:03,500 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:03,500 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138902960] [2021-11-19 13:40:03,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138902960] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:03,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595329624] [2021-11-19 13:40:03,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:03,501 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:03,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:03,502 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:03,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 13:40:03,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:03,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 13:40:03,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:03,761 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-19 13:40:03,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:04,069 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-19 13:40:04,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595329624] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:04,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1518530330] [2021-11-19 13:40:04,076 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:04,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:04,081 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 13:40:04,083 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:04,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2021-11-19 13:40:04,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120909398] [2021-11-19 13:40:04,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:04,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-19 13:40:04,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:04,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-19 13:40:04,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-19 13:40:04,088 INFO L87 Difference]: Start difference. First operand 66 states and 90 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-19 13:40:04,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:04,345 INFO L93 Difference]: Finished difference Result 134 states and 199 transitions. [2021-11-19 13:40:04,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-19 13:40:04,346 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) Word has length 50 [2021-11-19 13:40:04,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:04,350 INFO L225 Difference]: With dead ends: 134 [2021-11-19 13:40:04,351 INFO L226 Difference]: Without dead ends: 133 [2021-11-19 13:40:04,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-19 13:40:04,353 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 32 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:04,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 148 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 13:40:04,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-19 13:40:04,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 98. [2021-11-19 13:40:04,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-19 13:40:04,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-19 13:40:04,382 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 50 [2021-11-19 13:40:04,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:04,383 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-19 13:40:04,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-19 13:40:04,384 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-19 13:40:04,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-19 13:40:04,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:04,389 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2021-11-19 13:40:04,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:04,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-19 13:40:04,613 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:04,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:04,613 INFO L85 PathProgramCache]: Analyzing trace with hash -1720588685, now seen corresponding path program 1 times [2021-11-19 13:40:04,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:04,613 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222724265] [2021-11-19 13:40:04,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:04,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:04,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:04,751 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-11-19 13:40:04,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:04,752 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222724265] [2021-11-19 13:40:04,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222724265] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:40:04,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:40:04,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 13:40:04,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770830998] [2021-11-19 13:40:04,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:40:04,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 13:40:04,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:04,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 13:40:04,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:40:04,756 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 13:40:04,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:04,800 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-19 13:40:04,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 13:40:04,801 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 13:40:04,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:04,813 INFO L225 Difference]: With dead ends: 111 [2021-11-19 13:40:04,813 INFO L226 Difference]: Without dead ends: 110 [2021-11-19 13:40:04,814 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 13:40:04,817 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 69 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 13:40:04,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 69 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 13:40:04,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-19 13:40:04,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-19 13:40:04,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-19 13:40:04,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-19 13:40:04,860 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 69 [2021-11-19 13:40:04,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:04,861 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-19 13:40:04,862 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 13:40:04,862 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-19 13:40:04,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-19 13:40:04,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:04,872 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-19 13:40:04,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-19 13:40:04,872 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:04,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:04,873 INFO L85 PathProgramCache]: Analyzing trace with hash 831290973, now seen corresponding path program 2 times [2021-11-19 13:40:04,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:04,873 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564973750] [2021-11-19 13:40:04,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:04,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:04,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:04,966 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-19 13:40:04,967 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:04,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564973750] [2021-11-19 13:40:04,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564973750] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:40:04,967 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:40:04,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 13:40:04,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768589018] [2021-11-19 13:40:04,968 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:40:04,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 13:40:04,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:04,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 13:40:04,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-19 13:40:04,970 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 13:40:05,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:05,005 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-19 13:40:05,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 13:40:05,006 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 64 [2021-11-19 13:40:05,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:05,009 INFO L225 Difference]: With dead ends: 111 [2021-11-19 13:40:05,009 INFO L226 Difference]: Without dead ends: 110 [2021-11-19 13:40:05,010 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 13:40:05,011 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 45 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 13:40:05,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 45 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 13:40:05,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-19 13:40:05,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-19 13:40:05,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-19 13:40:05,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-19 13:40:05,040 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 64 [2021-11-19 13:40:05,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:05,041 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-19 13:40:05,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-19 13:40:05,041 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-19 13:40:05,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-19 13:40:05,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:05,055 INFO L514 BasicCegarLoop]: trace histogram [17, 15, 13, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 4, 1, 1, 1, 1] [2021-11-19 13:40:05,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-19 13:40:05,057 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:05,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:05,057 INFO L85 PathProgramCache]: Analyzing trace with hash -1671170236, now seen corresponding path program 2 times [2021-11-19 13:40:05,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:05,058 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401477737] [2021-11-19 13:40:05,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:05,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:05,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:05,246 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 46 proven. 238 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2021-11-19 13:40:05,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:05,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401477737] [2021-11-19 13:40:05,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401477737] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:05,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525223506] [2021-11-19 13:40:05,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:40:05,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:05,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:05,248 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:05,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 13:40:05,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-19 13:40:05,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:05,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:40:05,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:05,682 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 289 proven. 85 refuted. 0 times theorem prover too weak. 439 trivial. 0 not checked. [2021-11-19 13:40:05,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:06,534 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 289 proven. 88 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2021-11-19 13:40:06,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525223506] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:06,535 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [897318388] [2021-11-19 13:40:06,543 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:06,543 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:06,543 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 13:40:06,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:06,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2021-11-19 13:40:06,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557830169] [2021-11-19 13:40:06,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:06,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-19 13:40:06,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:06,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-19 13:40:06,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-11-19 13:40:06,555 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 17 states, 17 states have (on average 5.235294117647059) internal successors, (89), 17 states have internal predecessors, (89), 10 states have call successors, (16), 2 states have call predecessors, (16), 7 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-11-19 13:40:07,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:07,009 INFO L93 Difference]: Finished difference Result 245 states and 452 transitions. [2021-11-19 13:40:07,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-19 13:40:07,010 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.235294117647059) internal successors, (89), 17 states have internal predecessors, (89), 10 states have call successors, (16), 2 states have call predecessors, (16), 7 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) Word has length 156 [2021-11-19 13:40:07,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:07,013 INFO L225 Difference]: With dead ends: 245 [2021-11-19 13:40:07,013 INFO L226 Difference]: Without dead ends: 150 [2021-11-19 13:40:07,016 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=224, Invalid=588, Unknown=0, NotChecked=0, Total=812 [2021-11-19 13:40:07,017 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 185 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:07,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 101 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:40:07,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-19 13:40:07,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 135. [2021-11-19 13:40:07,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 106 states have (on average 1.0849056603773586) internal successors, (115), 103 states have internal predecessors, (115), 15 states have call successors, (15), 6 states have call predecessors, (15), 12 states have return successors, (77), 25 states have call predecessors, (77), 14 states have call successors, (77) [2021-11-19 13:40:07,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 207 transitions. [2021-11-19 13:40:07,047 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 207 transitions. Word has length 156 [2021-11-19 13:40:07,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:07,048 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 207 transitions. [2021-11-19 13:40:07,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.235294117647059) internal successors, (89), 17 states have internal predecessors, (89), 10 states have call successors, (16), 2 states have call predecessors, (16), 7 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-11-19 13:40:07,049 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 207 transitions. [2021-11-19 13:40:07,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-19 13:40:07,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:07,051 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 7, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2021-11-19 13:40:07,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:07,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:07,272 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:07,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:07,273 INFO L85 PathProgramCache]: Analyzing trace with hash -1800629964, now seen corresponding path program 3 times [2021-11-19 13:40:07,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:07,273 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871905366] [2021-11-19 13:40:07,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:07,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:07,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:07,331 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 74 proven. 3 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-19 13:40:07,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:07,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871905366] [2021-11-19 13:40:07,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871905366] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:07,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559602981] [2021-11-19 13:40:07,332 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:40:07,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:07,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:07,334 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:07,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 13:40:07,390 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:40:07,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:07,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:40:07,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:07,718 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 79 proven. 85 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-19 13:40:07,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:08,437 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 79 proven. 93 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-19 13:40:08,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559602981] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:08,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [212469528] [2021-11-19 13:40:08,442 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:08,443 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:08,443 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 13:40:08,444 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:08,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 13] total 17 [2021-11-19 13:40:08,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969891694] [2021-11-19 13:40:08,447 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:08,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-19 13:40:08,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:08,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-19 13:40:08,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-11-19 13:40:08,451 INFO L87 Difference]: Start difference. First operand 135 states and 207 transitions. Second operand has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 17 states have internal predecessors, (86), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (16), 6 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-19 13:40:08,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:08,692 INFO L93 Difference]: Finished difference Result 196 states and 304 transitions. [2021-11-19 13:40:08,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 13:40:08,693 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 17 states have internal predecessors, (86), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (16), 6 states have call predecessors, (16), 12 states have call successors, (16) Word has length 89 [2021-11-19 13:40:08,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:08,695 INFO L225 Difference]: With dead ends: 196 [2021-11-19 13:40:08,695 INFO L226 Difference]: Without dead ends: 64 [2021-11-19 13:40:08,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 166 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2021-11-19 13:40:08,698 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 67 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:08,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 95 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 13:40:08,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-19 13:40:08,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-19 13:40:08,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.08) internal successors, (54), 49 states have internal predecessors, (54), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-19 13:40:08,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-19 13:40:08,706 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 89 [2021-11-19 13:40:08,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:08,707 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-19 13:40:08,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 17 states have internal predecessors, (86), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (16), 6 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-19 13:40:08,707 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-19 13:40:08,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-19 13:40:08,708 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:08,709 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 8, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2021-11-19 13:40:08,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:08,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-19 13:40:08,925 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:08,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:08,925 INFO L85 PathProgramCache]: Analyzing trace with hash 1709508274, now seen corresponding path program 4 times [2021-11-19 13:40:08,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:08,926 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781128357] [2021-11-19 13:40:08,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:08,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:08,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:09,099 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-19 13:40:09,100 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:09,100 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781128357] [2021-11-19 13:40:09,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781128357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:09,100 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810508522] [2021-11-19 13:40:09,101 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:40:09,101 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:09,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:09,102 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:09,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 13:40:09,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:09,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 13:40:09,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:09,501 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 30 proven. 44 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2021-11-19 13:40:09,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:10,110 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 45 proven. 45 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-19 13:40:10,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810508522] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:10,111 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1139608726] [2021-11-19 13:40:10,115 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:10,115 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:10,116 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 13:40:10,117 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:10,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 13] total 25 [2021-11-19 13:40:10,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850847349] [2021-11-19 13:40:10,118 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:10,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-19 13:40:10,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:10,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-19 13:40:10,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2021-11-19 13:40:10,121 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 26 states, 25 states have (on average 2.8) internal successors, (70), 26 states have internal predecessors, (70), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) [2021-11-19 13:40:10,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:10,258 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-11-19 13:40:10,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 13:40:10,259 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.8) internal successors, (70), 26 states have internal predecessors, (70), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) Word has length 90 [2021-11-19 13:40:10,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:10,261 INFO L225 Difference]: With dead ends: 68 [2021-11-19 13:40:10,261 INFO L226 Difference]: Without dead ends: 67 [2021-11-19 13:40:10,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=187, Invalid=625, Unknown=0, NotChecked=0, Total=812 [2021-11-19 13:40:10,262 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 24 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:10,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 158 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 13:40:10,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-19 13:40:10,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2021-11-19 13:40:10,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 50 states have (on average 1.06) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-19 13:40:10,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-11-19 13:40:10,269 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 90 [2021-11-19 13:40:10,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:10,270 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-11-19 13:40:10,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.8) internal successors, (70), 26 states have internal predecessors, (70), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) [2021-11-19 13:40:10,270 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-11-19 13:40:10,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-19 13:40:10,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:10,272 INFO L514 BasicCegarLoop]: trace histogram [16, 14, 13, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 3, 1, 1, 1, 1] [2021-11-19 13:40:10,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:10,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-19 13:40:10,501 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:10,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:10,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1089648635, now seen corresponding path program 3 times [2021-11-19 13:40:10,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:10,502 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290129877] [2021-11-19 13:40:10,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:10,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:10,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:10,737 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 78 proven. 183 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-19 13:40:10,737 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:10,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290129877] [2021-11-19 13:40:10,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290129877] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:10,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421826723] [2021-11-19 13:40:10,737 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:40:10,738 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:10,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:10,739 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:10,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 13:40:10,821 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:40:10,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:10,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-19 13:40:10,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:11,394 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 78 proven. 129 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2021-11-19 13:40:11,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:12,868 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 144 proven. 122 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2021-11-19 13:40:12,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421826723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:12,869 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1374955107] [2021-11-19 13:40:12,873 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:12,874 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:12,874 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 13:40:12,875 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:12,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2021-11-19 13:40:12,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630818620] [2021-11-19 13:40:12,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:12,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-19 13:40:12,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:12,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-19 13:40:12,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2021-11-19 13:40:12,879 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2021-11-19 13:40:13,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:13,228 INFO L93 Difference]: Finished difference Result 128 states and 176 transitions. [2021-11-19 13:40:13,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-19 13:40:13,229 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) Word has length 148 [2021-11-19 13:40:13,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:13,231 INFO L225 Difference]: With dead ends: 128 [2021-11-19 13:40:13,231 INFO L226 Difference]: Without dead ends: 127 [2021-11-19 13:40:13,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 557 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=385, Invalid=1255, Unknown=0, NotChecked=0, Total=1640 [2021-11-19 13:40:13,234 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 61 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:13,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 222 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:40:13,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-19 13:40:13,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 99. [2021-11-19 13:40:13,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 76 states have internal predecessors, (81), 11 states have call successors, (11), 6 states have call predecessors, (11), 9 states have return successors, (47), 16 states have call predecessors, (47), 10 states have call successors, (47) [2021-11-19 13:40:13,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 139 transitions. [2021-11-19 13:40:13,257 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 139 transitions. Word has length 148 [2021-11-19 13:40:13,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:13,258 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 139 transitions. [2021-11-19 13:40:13,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2021-11-19 13:40:13,259 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 139 transitions. [2021-11-19 13:40:13,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-11-19 13:40:13,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:13,266 INFO L514 BasicCegarLoop]: trace histogram [34, 32, 27, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 15, 15, 10, 7, 1, 1, 1, 1] [2021-11-19 13:40:13,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:13,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:13,489 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:13,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:13,490 INFO L85 PathProgramCache]: Analyzing trace with hash 1211325540, now seen corresponding path program 4 times [2021-11-19 13:40:13,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:13,490 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10181949] [2021-11-19 13:40:13,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:13,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:13,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:13,731 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 389 proven. 976 refuted. 0 times theorem prover too weak. 2333 trivial. 0 not checked. [2021-11-19 13:40:13,731 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:13,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10181949] [2021-11-19 13:40:13,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10181949] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:13,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078346192] [2021-11-19 13:40:13,732 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:40:13,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:13,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:13,737 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:13,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-19 13:40:13,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:13,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 625 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 13:40:13,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:14,553 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 381 proven. 1338 refuted. 0 times theorem prover too weak. 1979 trivial. 0 not checked. [2021-11-19 13:40:14,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:16,494 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 381 proven. 1377 refuted. 0 times theorem prover too weak. 1940 trivial. 0 not checked. [2021-11-19 13:40:16,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078346192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:16,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [672813344] [2021-11-19 13:40:16,497 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:16,498 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:16,499 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 13:40:16,500 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:16,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 19] total 24 [2021-11-19 13:40:16,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944411826] [2021-11-19 13:40:16,503 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:16,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-19 13:40:16,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:16,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-19 13:40:16,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-19 13:40:16,507 INFO L87 Difference]: Start difference. First operand 99 states and 139 transitions. Second operand has 24 states, 24 states have (on average 5.5) internal successors, (132), 24 states have internal predecessors, (132), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (28), 12 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-19 13:40:17,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:17,062 INFO L93 Difference]: Finished difference Result 246 states and 392 transitions. [2021-11-19 13:40:17,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-19 13:40:17,069 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.5) internal successors, (132), 24 states have internal predecessors, (132), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (28), 12 states have call predecessors, (28), 18 states have call successors, (28) Word has length 324 [2021-11-19 13:40:17,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:17,071 INFO L225 Difference]: With dead ends: 246 [2021-11-19 13:40:17,072 INFO L226 Difference]: Without dead ends: 152 [2021-11-19 13:40:17,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 642 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=416, Invalid=1144, Unknown=0, NotChecked=0, Total=1560 [2021-11-19 13:40:17,078 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 310 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:17,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [310 Valid, 100 Invalid, 396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:40:17,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-19 13:40:17,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 137. [2021-11-19 13:40:17,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 109 states have (on average 1.0458715596330275) internal successors, (114), 105 states have internal predecessors, (114), 15 states have call successors, (15), 8 states have call predecessors, (15), 12 states have return successors, (57), 23 states have call predecessors, (57), 14 states have call successors, (57) [2021-11-19 13:40:17,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 186 transitions. [2021-11-19 13:40:17,093 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 186 transitions. Word has length 324 [2021-11-19 13:40:17,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:17,094 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 186 transitions. [2021-11-19 13:40:17,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.5) internal successors, (132), 24 states have internal predecessors, (132), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (28), 12 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-19 13:40:17,095 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 186 transitions. [2021-11-19 13:40:17,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2021-11-19 13:40:17,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:17,103 INFO L514 BasicCegarLoop]: trace histogram [36, 34, 29, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 16, 16, 11, 7, 1, 1, 1, 1] [2021-11-19 13:40:17,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:17,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-19 13:40:17,317 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:17,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:17,317 INFO L85 PathProgramCache]: Analyzing trace with hash -1024993837, now seen corresponding path program 5 times [2021-11-19 13:40:17,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:17,317 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971651096] [2021-11-19 13:40:17,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:17,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:17,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:17,612 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 590 proven. 1265 refuted. 0 times theorem prover too weak. 2328 trivial. 0 not checked. [2021-11-19 13:40:17,612 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:17,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971651096] [2021-11-19 13:40:17,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971651096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:17,613 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547940180] [2021-11-19 13:40:17,613 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:40:17,613 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:17,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:17,614 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:17,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-19 13:40:17,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-19 13:40:17,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:17,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:40:17,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:18,416 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 2004 proven. 95 refuted. 0 times theorem prover too weak. 2084 trivial. 0 not checked. [2021-11-19 13:40:18,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:19,981 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 1064 proven. 293 refuted. 0 times theorem prover too weak. 2826 trivial. 0 not checked. [2021-11-19 13:40:19,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547940180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:19,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1702074322] [2021-11-19 13:40:19,987 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:19,987 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:19,988 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 13:40:19,989 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:19,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10, 13] total 23 [2021-11-19 13:40:19,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441239414] [2021-11-19 13:40:19,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:19,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-19 13:40:19,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:19,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-19 13:40:19,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-11-19 13:40:19,994 INFO L87 Difference]: Start difference. First operand 137 states and 186 transitions. Second operand has 23 states, 23 states have (on average 5.739130434782608) internal successors, (132), 23 states have internal predecessors, (132), 16 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 14 states have call predecessors, (31), 16 states have call successors, (31) [2021-11-19 13:40:20,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:20,624 INFO L93 Difference]: Finished difference Result 272 states and 416 transitions. [2021-11-19 13:40:20,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-19 13:40:20,625 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 5.739130434782608) internal successors, (132), 23 states have internal predecessors, (132), 16 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 14 states have call predecessors, (31), 16 states have call successors, (31) Word has length 344 [2021-11-19 13:40:20,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:20,632 INFO L225 Difference]: With dead ends: 272 [2021-11-19 13:40:20,632 INFO L226 Difference]: Without dead ends: 140 [2021-11-19 13:40:20,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 687 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=451, Invalid=1355, Unknown=0, NotChecked=0, Total=1806 [2021-11-19 13:40:20,637 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 319 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:20,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [319 Valid, 118 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 13:40:20,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-19 13:40:20,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 122. [2021-11-19 13:40:20,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 98 states have (on average 1.0612244897959184) internal successors, (104), 94 states have internal predecessors, (104), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (30), 17 states have call predecessors, (30), 13 states have call successors, (30) [2021-11-19 13:40:20,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 148 transitions. [2021-11-19 13:40:20,651 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 148 transitions. Word has length 344 [2021-11-19 13:40:20,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:20,652 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 148 transitions. [2021-11-19 13:40:20,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 5.739130434782608) internal successors, (132), 23 states have internal predecessors, (132), 16 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 14 states have call predecessors, (31), 16 states have call successors, (31) [2021-11-19 13:40:20,653 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 148 transitions. [2021-11-19 13:40:20,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2021-11-19 13:40:20,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:20,659 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, 1] [2021-11-19 13:40:20,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:20,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-19 13:40:20,873 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:20,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:20,873 INFO L85 PathProgramCache]: Analyzing trace with hash -116726609, now seen corresponding path program 6 times [2021-11-19 13:40:20,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:20,873 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106084461] [2021-11-19 13:40:20,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:20,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:20,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:21,132 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 13:40:21,132 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:21,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106084461] [2021-11-19 13:40:21,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106084461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:21,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377474908] [2021-11-19 13:40:21,133 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:40:21,134 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:21,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:21,135 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:21,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-19 13:40:21,263 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:40:21,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:21,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 13:40:21,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:21,985 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 13:40:21,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:23,976 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 13:40:23,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377474908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:23,976 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [546160847] [2021-11-19 13:40:23,978 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:23,978 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:23,979 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 13:40:23,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:23,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 19] total 24 [2021-11-19 13:40:23,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575032097] [2021-11-19 13:40:23,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:23,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-19 13:40:23,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:23,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-19 13:40:23,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-19 13:40:23,983 INFO L87 Difference]: Start difference. First operand 122 states and 148 transitions. Second operand has 24 states, 24 states have (on average 5.583333333333333) internal successors, (134), 24 states have internal predecessors, (134), 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 13:40:24,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:24,415 INFO L93 Difference]: Finished difference Result 234 states and 304 transitions. [2021-11-19 13:40:24,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-19 13:40:24,416 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.583333333333333) internal successors, (134), 24 states have internal predecessors, (134), 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 299 [2021-11-19 13:40:24,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:24,418 INFO L225 Difference]: With dead ends: 234 [2021-11-19 13:40:24,418 INFO L226 Difference]: Without dead ends: 117 [2021-11-19 13:40:24,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 592 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=349, Invalid=911, Unknown=0, NotChecked=0, Total=1260 [2021-11-19 13:40:24,421 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 245 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:24,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 147 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:40:24,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-19 13:40:24,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 105. [2021-11-19 13:40:24,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 82 states have internal predecessors, (87), 13 states have call successors, (13), 10 states have call predecessors, (13), 7 states have return successors, (26), 12 states have call predecessors, (26), 12 states have call successors, (26) [2021-11-19 13:40:24,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 126 transitions. [2021-11-19 13:40:24,432 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 126 transitions. Word has length 299 [2021-11-19 13:40:24,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:24,433 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 126 transitions. [2021-11-19 13:40:24,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.583333333333333) internal successors, (134), 24 states have internal predecessors, (134), 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 13:40:24,434 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 126 transitions. [2021-11-19 13:40:24,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 764 [2021-11-19 13:40:24,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:24,465 INFO L514 BasicCegarLoop]: trace histogram [80, 75, 65, 41, 41, 41, 41, 38, 38, 38, 38, 38, 37, 37, 36, 36, 24, 15, 1, 1, 1, 1] [2021-11-19 13:40:24,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:24,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-19 13:40:24,681 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:24,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:24,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1190972166, now seen corresponding path program 7 times [2021-11-19 13:40:24,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:24,681 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682906968] [2021-11-19 13:40:24,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:24,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:24,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:25,211 INFO L134 CoverageAnalysis]: Checked inductivity of 21184 backedges. 1123 proven. 4086 refuted. 0 times theorem prover too weak. 15975 trivial. 0 not checked. [2021-11-19 13:40:25,211 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:25,211 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682906968] [2021-11-19 13:40:25,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682906968] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:25,212 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297955069] [2021-11-19 13:40:25,212 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:40:25,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:25,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:25,213 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:25,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-19 13:40:25,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:25,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-19 13:40:25,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:26,849 INFO L134 CoverageAnalysis]: Checked inductivity of 21184 backedges. 10559 proven. 2740 refuted. 0 times theorem prover too weak. 7885 trivial. 0 not checked. [2021-11-19 13:40:26,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:29,662 INFO L134 CoverageAnalysis]: Checked inductivity of 21184 backedges. 1325 proven. 5036 refuted. 0 times theorem prover too weak. 14823 trivial. 0 not checked. [2021-11-19 13:40:29,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297955069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:29,663 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1371634167] [2021-11-19 13:40:29,666 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:29,666 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:29,667 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java: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 13:40:29,668 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:29,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 24] total 29 [2021-11-19 13:40:29,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698279852] [2021-11-19 13:40:29,669 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:29,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-19 13:40:29,674 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:29,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-19 13:40:29,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2021-11-19 13:40:29,675 INFO L87 Difference]: Start difference. First operand 105 states and 126 transitions. Second operand has 29 states, 29 states have (on average 5.931034482758621) internal successors, (172), 29 states have internal predecessors, (172), 24 states have call successors, (31), 5 states have call predecessors, (31), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2021-11-19 13:40:30,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:30,369 INFO L93 Difference]: Finished difference Result 248 states and 325 transitions. [2021-11-19 13:40:30,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-19 13:40:30,370 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 5.931034482758621) internal successors, (172), 29 states have internal predecessors, (172), 24 states have call successors, (31), 5 states have call predecessors, (31), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) Word has length 763 [2021-11-19 13:40:30,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:30,373 INFO L225 Difference]: With dead ends: 248 [2021-11-19 13:40:30,373 INFO L226 Difference]: Without dead ends: 148 [2021-11-19 13:40:30,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1576 GetRequests, 1523 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=752, Invalid=2004, Unknown=0, NotChecked=0, Total=2756 [2021-11-19 13:40:30,376 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 378 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:30,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [378 Valid, 113 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 328 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 13:40:30,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-19 13:40:30,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 135. [2021-11-19 13:40:30,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 109 states have (on average 1.0458715596330275) internal successors, (114), 106 states have internal predecessors, (114), 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 13:40:30,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 169 transitions. [2021-11-19 13:40:30,387 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 169 transitions. Word has length 763 [2021-11-19 13:40:30,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:30,388 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 169 transitions. [2021-11-19 13:40:30,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 5.931034482758621) internal successors, (172), 29 states have internal predecessors, (172), 24 states have call successors, (31), 5 states have call predecessors, (31), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2021-11-19 13:40:30,389 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 169 transitions. [2021-11-19 13:40:30,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2021-11-19 13:40:30,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:30,391 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, 1] [2021-11-19 13:40:30,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:30,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-19 13:40:30,613 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:30,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:30,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1691492159, now seen corresponding path program 8 times [2021-11-19 13:40:30,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:30,613 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058247969] [2021-11-19 13:40:30,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:30,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:30,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:30,847 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 13:40:30,847 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:30,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058247969] [2021-11-19 13:40:30,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058247969] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:30,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345673177] [2021-11-19 13:40:30,848 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:40:30,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:30,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:30,849 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:30,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-19 13:40:31,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-19 13:40:31,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:31,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 13:40:31,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:31,684 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 1097 proven. 412 refuted. 0 times theorem prover too weak. 2525 trivial. 0 not checked. [2021-11-19 13:40:31,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:33,242 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 1097 proven. 448 refuted. 0 times theorem prover too weak. 2489 trivial. 0 not checked. [2021-11-19 13:40:33,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345673177] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:33,243 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [280934628] [2021-11-19 13:40:33,245 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:33,245 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:33,246 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 13:40:33,248 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:33,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12, 17] total 26 [2021-11-19 13:40:33,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473234995] [2021-11-19 13:40:33,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:33,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-19 13:40:33,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:33,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-19 13:40:33,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2021-11-19 13:40:33,255 INFO L87 Difference]: Start difference. First operand 135 states and 169 transitions. Second operand has 26 states, 26 states have (on average 5.5) internal successors, (143), 26 states have internal predecessors, (143), 16 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2021-11-19 13:40:33,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:33,833 INFO L93 Difference]: Finished difference Result 278 states and 363 transitions. [2021-11-19 13:40:33,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-19 13:40:33,834 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.5) internal successors, (143), 26 states have internal predecessors, (143), 16 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) Word has length 338 [2021-11-19 13:40:33,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:33,839 INFO L225 Difference]: With dead ends: 278 [2021-11-19 13:40:33,839 INFO L226 Difference]: Without dead ends: 148 [2021-11-19 13:40:33,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 670 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2021-11-19 13:40:33,842 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 197 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:33,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 186 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 511 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:40:33,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-19 13:40:33,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 124. [2021-11-19 13:40:33,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 98 states have internal predecessors, (102), 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 13:40:33,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 153 transitions. [2021-11-19 13:40:33,854 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 153 transitions. Word has length 338 [2021-11-19 13:40:33,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:33,857 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 153 transitions. [2021-11-19 13:40:33,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.5) internal successors, (143), 26 states have internal predecessors, (143), 16 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2021-11-19 13:40:33,858 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 153 transitions. [2021-11-19 13:40:33,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2021-11-19 13:40:33,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:33,861 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, 1] [2021-11-19 13:40:33,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:34,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:34,077 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:34,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:34,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1082859020, now seen corresponding path program 9 times [2021-11-19 13:40:34,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:34,077 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497776815] [2021-11-19 13:40:34,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:34,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:34,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:34,544 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 13:40:34,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:34,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497776815] [2021-11-19 13:40:34,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497776815] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:34,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170795095] [2021-11-19 13:40:34,545 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:40:34,545 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:34,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:34,546 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:34,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-19 13:40:34,772 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:40:34,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:34,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 771 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-19 13:40:34,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:35,833 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 13:40:35,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:41,483 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 13:40:41,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170795095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:41,483 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [296324178] [2021-11-19 13:40:41,486 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:41,486 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:41,487 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 13:40:41,488 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:41,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2021-11-19 13:40:41,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409823744] [2021-11-19 13:40:41,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:41,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-19 13:40:41,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:41,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-19 13:40:41,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2021-11-19 13:40:41,493 INFO L87 Difference]: Start difference. First operand 124 states and 153 transitions. Second operand has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 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 13:40:41,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:41,749 INFO L93 Difference]: Finished difference Result 155 states and 205 transitions. [2021-11-19 13:40:41,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-19 13:40:41,750 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 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 403 [2021-11-19 13:40:41,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:41,753 INFO L225 Difference]: With dead ends: 155 [2021-11-19 13:40:41,753 INFO L226 Difference]: Without dead ends: 154 [2021-11-19 13:40:41,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 889 GetRequests, 841 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 13:40:41,755 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 62 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:41,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 251 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:40:41,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-19 13:40:41,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 144. [2021-11-19 13:40:41,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 115 states have (on average 1.0260869565217392) internal successors, (118), 113 states have internal predecessors, (118), 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 13:40:41,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 191 transitions. [2021-11-19 13:40:41,767 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 191 transitions. Word has length 403 [2021-11-19 13:40:41,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:41,769 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 191 transitions. [2021-11-19 13:40:41,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 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 13:40:41,769 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 191 transitions. [2021-11-19 13:40:41,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1241 [2021-11-19 13:40:41,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:41,785 INFO L514 BasicCegarLoop]: trace histogram [129, 123, 105, 66, 66, 66, 66, 62, 62, 62, 62, 62, 61, 61, 60, 60, 39, 24, 1, 1, 1, 1] [2021-11-19 13:40:41,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:42,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-19 13:40:42,007 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:42,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:42,008 INFO L85 PathProgramCache]: Analyzing trace with hash 282595276, now seen corresponding path program 10 times [2021-11-19 13:40:42,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:42,008 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846479980] [2021-11-19 13:40:42,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:42,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:42,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:42,711 INFO L134 CoverageAnalysis]: Checked inductivity of 56407 backedges. 2116 proven. 8179 refuted. 0 times theorem prover too weak. 46112 trivial. 0 not checked. [2021-11-19 13:40:42,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:42,712 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846479980] [2021-11-19 13:40:42,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846479980] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:42,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113117336] [2021-11-19 13:40:42,713 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:40:42,713 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:42,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:42,714 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:42,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-19 13:40:43,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:43,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 2314 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-19 13:40:43,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:45,115 INFO L134 CoverageAnalysis]: Checked inductivity of 56407 backedges. 27227 proven. 5467 refuted. 0 times theorem prover too weak. 23713 trivial. 0 not checked. [2021-11-19 13:40:45,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:49,228 INFO L134 CoverageAnalysis]: Checked inductivity of 56407 backedges. 2511 proven. 9781 refuted. 0 times theorem prover too weak. 44115 trivial. 0 not checked. [2021-11-19 13:40:49,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113117336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:49,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [910532927] [2021-11-19 13:40:49,231 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:49,231 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:49,231 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 13:40:49,232 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:49,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 27] total 32 [2021-11-19 13:40:49,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136512275] [2021-11-19 13:40:49,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:49,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-19 13:40:49,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:49,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-19 13:40:49,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=838, Unknown=0, NotChecked=0, Total=992 [2021-11-19 13:40:49,237 INFO L87 Difference]: Start difference. First operand 144 states and 191 transitions. Second operand has 32 states, 32 states have (on average 5.90625) internal successors, (189), 32 states have internal predecessors, (189), 27 states have call successors, (34), 6 states have call predecessors, (34), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) [2021-11-19 13:40:50,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:50,251 INFO L93 Difference]: Finished difference Result 334 states and 486 transitions. [2021-11-19 13:40:50,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-19 13:40:50,252 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.90625) internal successors, (189), 32 states have internal predecessors, (189), 27 states have call successors, (34), 6 states have call predecessors, (34), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) Word has length 1240 [2021-11-19 13:40:50,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:50,256 INFO L225 Difference]: With dead ends: 334 [2021-11-19 13:40:50,257 INFO L226 Difference]: Without dead ends: 195 [2021-11-19 13:40:50,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2538 GetRequests, 2478 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=963, Invalid=2577, Unknown=0, NotChecked=0, Total=3540 [2021-11-19 13:40:50,262 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 784 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 426 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 784 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 426 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:50,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [784 Valid, 120 Invalid, 758 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [426 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:40:50,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-19 13:40:50,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 182. [2021-11-19 13:40:50,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 147 states have (on average 1.034013605442177) internal successors, (152), 143 states have internal predecessors, (152), 23 states have call successors, (23), 17 states have call predecessors, (23), 11 states have return successors, (64), 21 states have call predecessors, (64), 22 states have call successors, (64) [2021-11-19 13:40:50,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 239 transitions. [2021-11-19 13:40:50,278 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 239 transitions. Word has length 1240 [2021-11-19 13:40:50,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:50,281 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 239 transitions. [2021-11-19 13:40:50,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.90625) internal successors, (189), 32 states have internal predecessors, (189), 27 states have call successors, (34), 6 states have call predecessors, (34), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) [2021-11-19 13:40:50,282 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 239 transitions. [2021-11-19 13:40:50,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 810 [2021-11-19 13:40:50,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:50,332 INFO L514 BasicCegarLoop]: trace histogram [83, 82, 67, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 40, 40, 26, 16, 1, 1, 1, 1] [2021-11-19 13:40:50,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:50,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:50,545 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:50,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:50,546 INFO L85 PathProgramCache]: Analyzing trace with hash 98836433, now seen corresponding path program 11 times [2021-11-19 13:40:50,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:50,546 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956245134] [2021-11-19 13:40:50,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:50,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:50,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:51,059 INFO L134 CoverageAnalysis]: Checked inductivity of 23819 backedges. 2218 proven. 4945 refuted. 0 times theorem prover too weak. 16656 trivial. 0 not checked. [2021-11-19 13:40:51,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:51,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956245134] [2021-11-19 13:40:51,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956245134] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:51,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245083293] [2021-11-19 13:40:51,060 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:40:51,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:51,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:51,067 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:51,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-19 13:40:51,491 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2021-11-19 13:40:51,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:51,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 1128 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-19 13:40:51,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:52,809 INFO L134 CoverageAnalysis]: Checked inductivity of 23819 backedges. 3329 proven. 1960 refuted. 0 times theorem prover too weak. 18530 trivial. 0 not checked. [2021-11-19 13:40:52,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:40:55,456 INFO L134 CoverageAnalysis]: Checked inductivity of 23819 backedges. 3341 proven. 2028 refuted. 0 times theorem prover too weak. 18450 trivial. 0 not checked. [2021-11-19 13:40:55,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245083293] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:40:55,457 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1214027330] [2021-11-19 13:40:55,459 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:40:55,459 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:40:55,459 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 13:40:55,461 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:40:55,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14, 21] total 33 [2021-11-19 13:40:55,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481850094] [2021-11-19 13:40:55,462 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:40:55,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-19 13:40:55,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:40:55,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-19 13:40:55,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=867, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 13:40:55,466 INFO L87 Difference]: Start difference. First operand 182 states and 239 transitions. Second operand has 33 states, 33 states have (on average 5.9393939393939394) internal successors, (196), 33 states have internal predecessors, (196), 24 states have call successors, (35), 1 states have call predecessors, (35), 17 states have return successors, (51), 25 states have call predecessors, (51), 24 states have call successors, (51) [2021-11-19 13:40:56,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:40:56,433 INFO L93 Difference]: Finished difference Result 375 states and 523 transitions. [2021-11-19 13:40:56,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-19 13:40:56,434 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 5.9393939393939394) internal successors, (196), 33 states have internal predecessors, (196), 24 states have call successors, (35), 1 states have call predecessors, (35), 17 states have return successors, (51), 25 states have call predecessors, (51), 24 states have call successors, (51) Word has length 809 [2021-11-19 13:40:56,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:40:56,438 INFO L225 Difference]: With dead ends: 375 [2021-11-19 13:40:56,439 INFO L226 Difference]: Without dead ends: 198 [2021-11-19 13:40:56,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1665 GetRequests, 1609 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=680, Invalid=2182, Unknown=0, NotChecked=0, Total=2862 [2021-11-19 13:40:56,443 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 453 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 877 mSolverCounterSat, 293 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 453 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 1170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 877 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:40:56,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [453 Valid, 305 Invalid, 1170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [293 Valid, 877 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 13:40:56,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-19 13:40:56,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 153. [2021-11-19 13:40:56,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 123 states have (on average 1.024390243902439) internal successors, (126), 121 states have internal predecessors, (126), 20 states have call successors, (20), 15 states have call predecessors, (20), 9 states have return successors, (47), 16 states have call predecessors, (47), 19 states have call successors, (47) [2021-11-19 13:40:56,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 193 transitions. [2021-11-19 13:40:56,458 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 193 transitions. Word has length 809 [2021-11-19 13:40:56,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:40:56,459 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 193 transitions. [2021-11-19 13:40:56,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 5.9393939393939394) internal successors, (196), 33 states have internal predecessors, (196), 24 states have call successors, (35), 1 states have call predecessors, (35), 17 states have return successors, (51), 25 states have call predecessors, (51), 24 states have call successors, (51) [2021-11-19 13:40:56,460 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 193 transitions. [2021-11-19 13:40:56,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1320 [2021-11-19 13:40:56,478 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:40:56,479 INFO L514 BasicCegarLoop]: trace histogram [135, 134, 109, 67, 67, 67, 67, 67, 67, 67, 67, 67, 67, 67, 66, 66, 42, 26, 1, 1, 1, 1] [2021-11-19 13:40:56,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-19 13:40:56,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:56,702 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:40:56,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:40:56,703 INFO L85 PathProgramCache]: Analyzing trace with hash 15947063, now seen corresponding path program 12 times [2021-11-19 13:40:56,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:40:56,703 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102579340] [2021-11-19 13:40:56,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:40:56,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:40:56,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:40:57,517 INFO L134 CoverageAnalysis]: Checked inductivity of 63842 backedges. 4441 proven. 10243 refuted. 0 times theorem prover too weak. 49158 trivial. 0 not checked. [2021-11-19 13:40:57,517 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:40:57,518 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102579340] [2021-11-19 13:40:57,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1102579340] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:40:57,518 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574420722] [2021-11-19 13:40:57,518 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:40:57,519 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:40:57,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:40:57,521 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:40:57,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-19 13:40:57,914 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:40:57,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:40:57,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 1636 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-19 13:40:57,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:40:59,964 INFO L134 CoverageAnalysis]: Checked inductivity of 63842 backedges. 5143 proven. 10902 refuted. 0 times theorem prover too weak. 47797 trivial. 0 not checked. [2021-11-19 13:40:59,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:41:06,093 INFO L134 CoverageAnalysis]: Checked inductivity of 63842 backedges. 5143 proven. 11133 refuted. 0 times theorem prover too weak. 47566 trivial. 0 not checked. [2021-11-19 13:41:06,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574420722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:41:06,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1377668643] [2021-11-19 13:41:06,097 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:41:06,098 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:41:06,098 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 13:41:06,099 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:41:06,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 35] total 40 [2021-11-19 13:41:06,100 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15271293] [2021-11-19 13:41:06,101 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:41:06,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-19 13:41:06,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:41:06,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-19 13:41:06,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1309, Unknown=0, NotChecked=0, Total=1560 [2021-11-19 13:41:06,107 INFO L87 Difference]: Start difference. First operand 153 states and 193 transitions. Second operand has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) [2021-11-19 13:41:07,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:41:07,249 INFO L93 Difference]: Finished difference Result 353 states and 487 transitions. [2021-11-19 13:41:07,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-19 13:41:07,250 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) Word has length 1319 [2021-11-19 13:41:07,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:41:07,254 INFO L225 Difference]: With dead ends: 353 [2021-11-19 13:41:07,254 INFO L226 Difference]: Without dead ends: 205 [2021-11-19 13:41:07,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2707 GetRequests, 2631 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1251 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1360, Invalid=4340, Unknown=0, NotChecked=0, Total=5700 [2021-11-19 13:41:07,258 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 911 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 665 mSolverCounterSat, 588 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 911 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 1253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 588 IncrementalHoareTripleChecker+Valid, 665 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:41:07,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [911 Valid, 209 Invalid, 1253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [588 Valid, 665 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 13:41:07,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-19 13:41:07,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 166. [2021-11-19 13:41:07,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 133 states have (on average 1.0225563909774436) internal successors, (136), 132 states have internal predecessors, (136), 22 states have call successors, (22), 16 states have call predecessors, (22), 10 states have return successors, (56), 17 states have call predecessors, (56), 21 states have call successors, (56) [2021-11-19 13:41:07,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 214 transitions. [2021-11-19 13:41:07,275 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 214 transitions. Word has length 1319 [2021-11-19 13:41:07,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:41:07,276 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 214 transitions. [2021-11-19 13:41:07,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) [2021-11-19 13:41:07,277 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 214 transitions. [2021-11-19 13:41:07,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1065 [2021-11-19 13:41:07,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:41:07,290 INFO L514 BasicCegarLoop]: trace histogram [109, 108, 88, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 53, 53, 34, 21, 1, 1, 1, 1] [2021-11-19 13:41:07,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-19 13:41:07,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:41:07,513 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:41:07,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:41:07,513 INFO L85 PathProgramCache]: Analyzing trace with hash -1503244552, now seen corresponding path program 13 times [2021-11-19 13:41:07,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:41:07,513 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716861567] [2021-11-19 13:41:07,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:41:07,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:41:07,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:41:08,717 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 6794 proven. 10214 refuted. 0 times theorem prover too weak. 24405 trivial. 0 not checked. [2021-11-19 13:41:08,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:41:08,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716861567] [2021-11-19 13:41:08,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716861567] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:41:08,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52184985] [2021-11-19 13:41:08,717 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:41:08,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:41:08,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:41:08,721 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:41:08,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-19 13:41:09,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:41:09,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 1993 conjuncts, 217 conjunts are in the unsatisfiable core [2021-11-19 13:41:09,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:41:11,668 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 6686 proven. 7802 refuted. 0 times theorem prover too weak. 26925 trivial. 0 not checked. [2021-11-19 13:41:11,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:41:40,474 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 7863 proven. 7339 refuted. 0 times theorem prover too weak. 26211 trivial. 0 not checked. [2021-11-19 13:41:40,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52184985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:41:40,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206301023] [2021-11-19 13:41:40,477 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:41:40,477 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:41:40,477 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 13:41:40,477 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:41:40,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 41] total 59 [2021-11-19 13:41:40,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140773963] [2021-11-19 13:41:40,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:41:40,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-19 13:41:40,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:41:40,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-19 13:41:40,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=2770, Unknown=0, NotChecked=0, Total=3540 [2021-11-19 13:41:40,483 INFO L87 Difference]: Start difference. First operand 166 states and 214 transitions. Second operand has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) [2021-11-19 13:41:40,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:41:40,750 INFO L93 Difference]: Finished difference Result 197 states and 270 transitions. [2021-11-19 13:41:40,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-19 13:41:40,751 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) Word has length 1064 [2021-11-19 13:41:40,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:41:40,754 INFO L225 Difference]: With dead ends: 197 [2021-11-19 13:41:40,755 INFO L226 Difference]: Without dead ends: 196 [2021-11-19 13:41:40,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2347 GetRequests, 2285 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1749 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=871, Invalid=3161, Unknown=0, NotChecked=0, Total=4032 [2021-11-19 13:41:40,757 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 77 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:41:40,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 174 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 181 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:41:40,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-19 13:41:40,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 186. [2021-11-19 13:41:40,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 149 states have (on average 1.0201342281879195) internal successors, (152), 147 states have internal predecessors, (152), 24 states have call successors, (24), 16 states have call predecessors, (24), 12 states have return successors, (80), 22 states have call predecessors, (80), 23 states have call successors, (80) [2021-11-19 13:41:40,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 256 transitions. [2021-11-19 13:41:40,772 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 256 transitions. Word has length 1064 [2021-11-19 13:41:40,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:41:40,773 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 256 transitions. [2021-11-19 13:41:40,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) [2021-11-19 13:41:40,774 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 256 transitions. [2021-11-19 13:41:40,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3242 [2021-11-19 13:41:40,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:41:40,866 INFO L514 BasicCegarLoop]: trace histogram [333, 327, 270, 168, 168, 168, 168, 164, 164, 164, 164, 164, 163, 163, 162, 162, 102, 63, 1, 1, 1, 1] [2021-11-19 13:41:40,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-19 13:41:41,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:41:41,067 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:41:41,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:41:41,068 INFO L85 PathProgramCache]: Analyzing trace with hash -983275546, now seen corresponding path program 14 times [2021-11-19 13:41:41,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:41:41,068 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944098618] [2021-11-19 13:41:41,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:41:41,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:41:41,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:41:43,250 INFO L134 CoverageAnalysis]: Checked inductivity of 388468 backedges. 7133 proven. 30578 refuted. 0 times theorem prover too weak. 350757 trivial. 0 not checked. [2021-11-19 13:41:43,251 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:41:43,251 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944098618] [2021-11-19 13:41:43,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944098618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:41:43,251 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560030933] [2021-11-19 13:41:43,252 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:41:43,252 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:41:43,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:41:43,253 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:41:43,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-19 13:41:45,614 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 172 check-sat command(s) [2021-11-19 13:41:45,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:41:45,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 4235 conjuncts, 437 conjunts are in the unsatisfiable core [2021-11-19 13:41:45,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:41:52,134 INFO L134 CoverageAnalysis]: Checked inductivity of 388468 backedges. 117453 proven. 31331 refuted. 0 times theorem prover too weak. 239684 trivial. 0 not checked. [2021-11-19 13:41:52,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:25,855 INFO L134 CoverageAnalysis]: Checked inductivity of 388468 backedges. 120155 proven. 30143 refuted. 0 times theorem prover too weak. 238170 trivial. 0 not checked. [2021-11-19 13:43:25,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560030933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:25,856 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2095094466] [2021-11-19 13:43:25,859 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:43:25,859 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:43:25,862 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 13:43:25,863 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:43:25,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 27, 50] total 83 [2021-11-19 13:43:25,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188831160] [2021-11-19 13:43:25,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:25,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-19 13:43:25,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:43:25,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-19 13:43:25,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=882, Invalid=5924, Unknown=0, NotChecked=0, Total=6806 [2021-11-19 13:43:25,873 INFO L87 Difference]: Start difference. First operand 186 states and 256 transitions. Second operand has 83 states, 83 states have (on average 3.3734939759036147) internal successors, (280), 83 states have internal predecessors, (280), 35 states have call successors, (39), 6 states have call predecessors, (39), 29 states have return successors, (67), 57 states have call predecessors, (67), 30 states have call successors, (67) [2021-11-19 13:43:29,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:29,280 INFO L93 Difference]: Finished difference Result 497 states and 790 transitions. [2021-11-19 13:43:29,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-11-19 13:43:29,281 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.3734939759036147) internal successors, (280), 83 states have internal predecessors, (280), 35 states have call successors, (39), 6 states have call predecessors, (39), 29 states have return successors, (67), 57 states have call predecessors, (67), 30 states have call successors, (67) Word has length 3241 [2021-11-19 13:43:29,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:29,286 INFO L225 Difference]: With dead ends: 497 [2021-11-19 13:43:29,286 INFO L226 Difference]: Without dead ends: 316 [2021-11-19 13:43:29,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6605 GetRequests, 6441 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9520 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3818, Invalid=23572, Unknown=0, NotChecked=0, Total=27390 [2021-11-19 13:43:29,299 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 766 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 1502 mSolverCounterSat, 508 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 766 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 2010 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 508 IncrementalHoareTripleChecker+Valid, 1502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 13:43:29,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [766 Valid, 161 Invalid, 2010 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [508 Valid, 1502 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 13:43:29,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2021-11-19 13:43:29,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 272. [2021-11-19 13:43:29,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 219 states have (on average 1.0228310502283104) internal successors, (224), 215 states have internal predecessors, (224), 35 states have call successors, (35), 23 states have call predecessors, (35), 17 states have return successors, (147), 33 states have call predecessors, (147), 34 states have call successors, (147) [2021-11-19 13:43:29,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 406 transitions. [2021-11-19 13:43:29,321 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 406 transitions. Word has length 3241 [2021-11-19 13:43:29,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:29,323 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 406 transitions. [2021-11-19 13:43:29,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.3734939759036147) internal successors, (280), 83 states have internal predecessors, (280), 35 states have call successors, (39), 6 states have call predecessors, (39), 29 states have return successors, (67), 57 states have call predecessors, (67), 30 states have call successors, (67) [2021-11-19 13:43:29,324 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 406 transitions. [2021-11-19 13:43:29,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3125 [2021-11-19 13:43:29,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:29,398 INFO L514 BasicCegarLoop]: trace histogram [319, 318, 258, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 158, 158, 99, 61, 1, 1, 1, 1] [2021-11-19 13:43:29,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:29,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-19 13:43:29,598 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:43:29,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:29,599 INFO L85 PathProgramCache]: Analyzing trace with hash -549890765, now seen corresponding path program 15 times [2021-11-19 13:43:29,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:43:29,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407036120] [2021-11-19 13:43:29,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:29,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:43:30,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:31,816 INFO L134 CoverageAnalysis]: Checked inductivity of 360853 backedges. 24356 proven. 7475 refuted. 0 times theorem prover too weak. 329022 trivial. 0 not checked. [2021-11-19 13:43:31,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:43:31,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407036120] [2021-11-19 13:43:31,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407036120] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:43:31,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72043031] [2021-11-19 13:43:31,818 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:43:31,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:31,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:31,819 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:31,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-19 13:43:33,730 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:43:33,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:43:33,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 3866 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-19 13:43:33,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:38,215 INFO L134 CoverageAnalysis]: Checked inductivity of 360853 backedges. 188279 proven. 10882 refuted. 0 times theorem prover too weak. 161692 trivial. 0 not checked. [2021-11-19 13:43:38,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:52,749 INFO L134 CoverageAnalysis]: Checked inductivity of 360853 backedges. 12379 proven. 34841 refuted. 0 times theorem prover too weak. 313633 trivial. 0 not checked. [2021-11-19 13:43:52,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72043031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:52,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [279801821] [2021-11-19 13:43:52,752 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:43:52,752 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:43:52,752 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 13:43:52,753 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:43:52,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 35] total 40 [2021-11-19 13:43:52,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933406756] [2021-11-19 13:43:52,756 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:52,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-19 13:43:52,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:43:52,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-19 13:43:52,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2021-11-19 13:43:52,763 INFO L87 Difference]: Start difference. First operand 272 states and 406 transitions. Second operand has 40 states, 40 states have (on average 5.9) internal successors, (236), 40 states have internal predecessors, (236), 34 states have call successors, (41), 2 states have call predecessors, (41), 18 states have return successors, (57), 20 states have call predecessors, (57), 34 states have call successors, (57) [2021-11-19 13:43:53,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:53,747 INFO L93 Difference]: Finished difference Result 534 states and 837 transitions. [2021-11-19 13:43:53,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-19 13:43:53,748 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.9) internal successors, (236), 40 states have internal predecessors, (236), 34 states have call successors, (41), 2 states have call predecessors, (41), 18 states have return successors, (57), 20 states have call predecessors, (57), 34 states have call successors, (57) Word has length 3124 [2021-11-19 13:43:53,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:53,752 INFO L225 Difference]: With dead ends: 534 [2021-11-19 13:43:53,752 INFO L226 Difference]: Without dead ends: 267 [2021-11-19 13:43:53,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6300 GetRequests, 6236 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 961 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=999, Invalid=3033, Unknown=0, NotChecked=0, Total=4032 [2021-11-19 13:43:53,757 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 662 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 901 mSolverCounterSat, 703 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 662 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 1604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 703 IncrementalHoareTripleChecker+Valid, 901 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:43:53,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [662 Valid, 281 Invalid, 1604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [703 Valid, 901 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 13:43:53,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-19 13:43:53,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 207. [2021-11-19 13:43:53,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 164 states have internal predecessors, (169), 27 states have call successors, (27), 18 states have call predecessors, (27), 13 states have return successors, (94), 24 states have call predecessors, (94), 26 states have call successors, (94) [2021-11-19 13:43:53,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 290 transitions. [2021-11-19 13:43:53,776 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 290 transitions. Word has length 3124 [2021-11-19 13:43:53,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:53,778 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 290 transitions. [2021-11-19 13:43:53,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.9) internal successors, (236), 40 states have internal predecessors, (236), 34 states have call successors, (41), 2 states have call predecessors, (41), 18 states have return successors, (57), 20 states have call predecessors, (57), 34 states have call successors, (57) [2021-11-19 13:43:53,779 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 290 transitions. [2021-11-19 13:43:53,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5225 [2021-11-19 13:43:53,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:53,947 INFO L514 BasicCegarLoop]: trace histogram [534, 531, 432, 267, 267, 267, 267, 266, 266, 266, 266, 266, 265, 265, 264, 264, 165, 102, 1, 1, 1, 1] [2021-11-19 13:43:53,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:54,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-19 13:43:54,147 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:43:54,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:54,148 INFO L85 PathProgramCache]: Analyzing trace with hash 279591208, now seen corresponding path program 16 times [2021-11-19 13:43:54,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:43:54,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586567254] [2021-11-19 13:43:54,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:54,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:43:55,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:58,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1011337 backedges. 15414 proven. 61851 refuted. 0 times theorem prover too weak. 934072 trivial. 0 not checked. [2021-11-19 13:43:58,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:43:58,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586567254] [2021-11-19 13:43:58,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [586567254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:43:58,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284667140] [2021-11-19 13:43:58,476 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:43:58,476 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:58,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:58,477 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:58,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-19 13:44:01,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:44:01,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 9676 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-19 13:44:01,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:08,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1011337 backedges. 467104 proven. 38514 refuted. 0 times theorem prover too weak. 505719 trivial. 0 not checked. [2021-11-19 13:44:08,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:25,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1011337 backedges. 18235 proven. 68142 refuted. 0 times theorem prover too weak. 924960 trivial. 0 not checked. [2021-11-19 13:44:25,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284667140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:25,243 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2143850949] [2021-11-19 13:44:25,246 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:44:25,246 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:44:25,247 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 13:44:25,255 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:44:25,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 41] total 46 [2021-11-19 13:44:25,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925516876] [2021-11-19 13:44:25,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:44:25,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-19 13:44:25,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:44:25,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-19 13:44:25,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1766, Unknown=0, NotChecked=0, Total=2070 [2021-11-19 13:44:25,269 INFO L87 Difference]: Start difference. First operand 207 states and 290 transitions. Second operand has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 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 13:44:26,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:44:26,951 INFO L93 Difference]: Finished difference Result 532 states and 809 transitions. [2021-11-19 13:44:26,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-19 13:44:26,951 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 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 5224 [2021-11-19 13:44:26,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:44:26,959 INFO L225 Difference]: With dead ends: 532 [2021-11-19 13:44:26,959 INFO L226 Difference]: Without dead ends: 330 [2021-11-19 13:44:26,964 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10552 GetRequests, 10444 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 13:44:26,965 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 1161 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 820 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1161 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 1643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 820 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 13:44:26,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1161 Valid, 232 Invalid, 1643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [820 Valid, 823 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 13:44:26,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-11-19 13:44:26,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 263. [2021-11-19 13:44:26,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 213 states have (on average 1.0234741784037558) internal successors, (218), 209 states have internal predecessors, (218), 35 states have call successors, (35), 26 states have call predecessors, (35), 14 states have return successors, (112), 27 states have call predecessors, (112), 34 states have call successors, (112) [2021-11-19 13:44:26,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 365 transitions. [2021-11-19 13:44:26,991 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 365 transitions. Word has length 5224 [2021-11-19 13:44:26,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:44:26,994 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 365 transitions. [2021-11-19 13:44:26,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 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 13:44:26,994 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 365 transitions. [2021-11-19 13:44:27,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4145 [2021-11-19 13:44:27,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:44:27,118 INFO L514 BasicCegarLoop]: trace histogram [423, 422, 342, 211, 211, 211, 211, 211, 211, 211, 211, 211, 211, 211, 210, 210, 131, 81, 1, 1, 1, 1] [2021-11-19 13:44:27,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:27,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-19 13:44:27,318 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:44:27,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:44:27,319 INFO L85 PathProgramCache]: Analyzing trace with hash -2063068631, now seen corresponding path program 17 times [2021-11-19 13:44:27,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:44:27,320 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148691685] [2021-11-19 13:44:27,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:44:27,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:44:28,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:44:30,099 INFO L134 CoverageAnalysis]: Checked inductivity of 635819 backedges. 21505 proven. 44094 refuted. 0 times theorem prover too weak. 570220 trivial. 0 not checked. [2021-11-19 13:44:30,100 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:44:30,100 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148691685] [2021-11-19 13:44:30,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148691685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:44:30,100 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611934187] [2021-11-19 13:44:30,100 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:44:30,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:44:30,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:44:30,101 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:44:30,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-19 13:44:32,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 77 check-sat command(s) [2021-11-19 13:44:32,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:32,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 2079 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-19 13:44:32,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:37,719 INFO L134 CoverageAnalysis]: Checked inductivity of 635819 backedges. 20816 proven. 37182 refuted. 0 times theorem prover too weak. 577821 trivial. 0 not checked. [2021-11-19 13:44:37,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:52,975 INFO L134 CoverageAnalysis]: Checked inductivity of 635819 backedges. 20812 proven. 37525 refuted. 0 times theorem prover too weak. 577482 trivial. 0 not checked. [2021-11-19 13:44:52,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611934187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:52,976 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [452107284] [2021-11-19 13:44:52,978 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:44:52,979 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:44:52,979 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 13:44:52,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:44:52,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 36] total 45 [2021-11-19 13:44:52,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557208272] [2021-11-19 13:44:52,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:44:52,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-19 13:44:52,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:44:52,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-19 13:44:52,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=1651, Unknown=0, NotChecked=0, Total=1980 [2021-11-19 13:44:52,992 INFO L87 Difference]: Start difference. First operand 263 states and 365 transitions. Second operand has 45 states, 45 states have (on average 6.266666666666667) internal successors, (282), 45 states have internal predecessors, (282), 41 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (72), 30 states have call predecessors, (72), 41 states have call successors, (72) [2021-11-19 13:44:54,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:44:54,428 INFO L93 Difference]: Finished difference Result 610 states and 973 transitions. [2021-11-19 13:44:54,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-19 13:44:54,429 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 6.266666666666667) internal successors, (282), 45 states have internal predecessors, (282), 41 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (72), 30 states have call predecessors, (72), 41 states have call successors, (72) Word has length 4144 [2021-11-19 13:44:54,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:44:54,436 INFO L225 Difference]: With dead ends: 610 [2021-11-19 13:44:54,437 INFO L226 Difference]: Without dead ends: 352 [2021-11-19 13:44:54,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8358 GetRequests, 8283 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1309 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1317, Invalid=4383, Unknown=0, NotChecked=0, Total=5700 [2021-11-19 13:44:54,442 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 1052 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 1496 mSolverCounterSat, 1038 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1052 SdHoareTripleChecker+Valid, 445 SdHoareTripleChecker+Invalid, 2534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1038 IncrementalHoareTripleChecker+Valid, 1496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 13:44:54,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1052 Valid, 445 Invalid, 2534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1038 Valid, 1496 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 13:44:54,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-11-19 13:44:54,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 229. [2021-11-19 13:44:54,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 184 states have (on average 1.016304347826087) internal successors, (187), 183 states have internal predecessors, (187), 31 states have call successors, (31), 22 states have call predecessors, (31), 13 states have return successors, (98), 23 states have call predecessors, (98), 30 states have call successors, (98) [2021-11-19 13:44:54,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 316 transitions. [2021-11-19 13:44:54,473 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 316 transitions. Word has length 4144 [2021-11-19 13:44:54,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:44:54,475 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 316 transitions. [2021-11-19 13:44:54,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 6.266666666666667) internal successors, (282), 45 states have internal predecessors, (282), 41 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (72), 30 states have call predecessors, (72), 41 states have call successors, (72) [2021-11-19 13:44:54,476 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 316 transitions. [2021-11-19 13:44:54,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8480 [2021-11-19 13:44:54,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:44:54,927 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, 1] [2021-11-19 13:44:54,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:55,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-19 13:44:55,128 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:44:55,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:44:55,131 INFO L85 PathProgramCache]: Analyzing trace with hash 1270958571, now seen corresponding path program 18 times [2021-11-19 13:44:55,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:44:55,131 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328955673] [2021-11-19 13:44:55,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:44:55,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:44:57,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:45:02,772 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 13:45:02,773 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:45:02,773 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328955673] [2021-11-19 13:45:02,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328955673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:45:02,773 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770883798] [2021-11-19 13:45:02,773 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:45:02,773 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:45:02,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:45:02,774 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:45:02,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-19 13:45:05,604 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:45:05,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:45:05,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 10487 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-19 13:45:05,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:45:16,974 INFO L134 CoverageAnalysis]: Checked inductivity of 2667454 backedges. 1213784 proven. 68208 refuted. 0 times theorem prover too weak. 1385462 trivial. 0 not checked. [2021-11-19 13:45:16,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:45:42,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2667454 backedges. 30508 proven. 118602 refuted. 0 times theorem prover too weak. 2518344 trivial. 0 not checked. [2021-11-19 13:45:42,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [770883798] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:45:42,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2131097673] [2021-11-19 13:45:42,646 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-19 13:45:42,646 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:45:42,646 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 13:45:42,647 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:45:42,654 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 43] total 48 [2021-11-19 13:45:42,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997611418] [2021-11-19 13:45:42,655 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:45:42,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-19 13:45:42,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:45:42,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-19 13:45:42,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1938, Unknown=0, NotChecked=0, Total=2256 [2021-11-19 13:45:42,663 INFO L87 Difference]: Start difference. First operand 229 states and 316 transitions. Second operand has 48 states, 48 states have (on average 5.9375) internal successors, (285), 48 states have internal predecessors, (285), 43 states have call successors, (50), 6 states have call predecessors, (50), 20 states have return successors, (61), 22 states have call predecessors, (61), 39 states have call successors, (61) [2021-11-19 13:45:44,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:45:44,638 INFO L93 Difference]: Finished difference Result 600 states and 879 transitions. [2021-11-19 13:45:44,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-19 13:45:44,641 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.9375) internal successors, (285), 48 states have internal predecessors, (285), 43 states have call successors, (50), 6 states have call predecessors, (50), 20 states have return successors, (61), 22 states have call predecessors, (61), 39 states have call successors, (61) Word has length 8479 [2021-11-19 13:45:44,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:45:44,647 INFO L225 Difference]: With dead ends: 600 [2021-11-19 13:45:44,647 INFO L226 Difference]: Without dead ends: 376 [2021-11-19 13:45:44,652 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17078 GetRequests, 16955 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3973 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3461, Invalid=11545, Unknown=0, NotChecked=0, Total=15006 [2021-11-19 13:45:44,653 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 1783 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 795 mSolverCounterSat, 1103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1783 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 1898 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1103 IncrementalHoareTripleChecker+Valid, 795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 13:45:44,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1783 Valid, 261 Invalid, 1898 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1103 Valid, 795 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 13:45:44,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-19 13:45:44,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 235. [2021-11-19 13:45:44,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 189 states have (on average 1.0158730158730158) internal successors, (192), 188 states have internal predecessors, (192), 32 states have call successors, (32), 23 states have call predecessors, (32), 13 states have return successors, (97), 23 states have call predecessors, (97), 31 states have call successors, (97) [2021-11-19 13:45:44,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 321 transitions. [2021-11-19 13:45:44,675 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 321 transitions. Word has length 8479 [2021-11-19 13:45:44,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:45:44,678 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 321 transitions. [2021-11-19 13:45:44,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.9375) internal successors, (285), 48 states have internal predecessors, (285), 43 states have call successors, (50), 6 states have call predecessors, (50), 20 states have return successors, (61), 22 states have call predecessors, (61), 39 states have call successors, (61) [2021-11-19 13:45:44,679 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 321 transitions. [2021-11-19 13:45:44,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4557 [2021-11-19 13:45:44,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:45:44,831 INFO L514 BasicCegarLoop]: trace histogram [465, 464, 376, 232, 232, 232, 232, 232, 232, 232, 232, 232, 232, 232, 231, 231, 144, 89, 1, 1, 1, 1] [2021-11-19 13:45:44,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-19 13:45:45,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-19 13:45:45,057 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-19 13:45:45,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:45:45,058 INFO L85 PathProgramCache]: Analyzing trace with hash -2122773944, now seen corresponding path program 19 times [2021-11-19 13:45:45,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:45:45,058 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769037185] [2021-11-19 13:45:45,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:45:45,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:45:46,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:45:50,244 INFO L134 CoverageAnalysis]: Checked inductivity of 768821 backedges. 134587 proven. 182534 refuted. 0 times theorem prover too weak. 451700 trivial. 0 not checked. [2021-11-19 13:45:50,244 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:45:50,245 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769037185] [2021-11-19 13:45:50,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769037185] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:45:50,245 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413531778] [2021-11-19 13:45:50,245 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:45:50,245 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:45:50,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:45:50,246 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:45:50,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f1ae1ce1-6d92-439d-8313-4a6e947003e4/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-19 13:45:52,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:45:52,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 8443 conjuncts, 929 conjunts are in the unsatisfiable core [2021-11-19 13:45:52,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:46:02,505 INFO L134 CoverageAnalysis]: Checked inductivity of 768821 backedges. 132268 proven. 139641 refuted. 0 times theorem prover too weak. 496912 trivial. 0 not checked. [2021-11-19 13:46:02,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:04,225 WARN L227 SmtUtils]: Spent 12.05s 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 13:49:16,332 WARN L227 SmtUtils]: Spent 12.04s 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 13:49:28,522 WARN L227 SmtUtils]: Spent 12.16s 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 13:49:40,798 WARN L227 SmtUtils]: Spent 12.20s 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)