./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF --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 be0a584ba9648c80e7a0523ff51ba530f1926c55cecd3c62f2cee05fbbff42e3 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:33:55,204 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:33:55,206 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:33:55,248 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:33:55,249 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:33:55,250 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:33:55,252 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:33:55,255 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:33:55,258 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:33:55,259 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:33:55,261 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:33:55,262 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:33:55,263 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:33:55,264 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:33:55,266 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:33:55,268 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:33:55,269 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:33:55,271 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:33:55,273 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:33:55,276 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:33:55,278 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:33:55,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:33:55,281 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:33:55,282 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:33:55,286 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:33:55,287 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:33:55,287 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:33:55,291 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:33:55,292 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:33:55,296 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:33:55,296 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:33:55,297 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:33:55,298 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:33:55,299 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:33:55,300 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:33:55,300 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:33:55,301 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:33:55,302 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:33:55,302 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:33:55,303 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:33:55,304 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:33:55,308 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/config/svcomp-Overflow-32bit-Taipan_Default.epf [2021-11-12 22:33:55,357 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:33:55,357 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:33:55,359 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:33:55,359 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:33:55,359 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:33:55,360 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:33:55,360 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:33:55,360 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:33:55,360 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:33:55,360 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:33:55,362 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:33:55,362 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:33:55,362 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:33:55,362 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:33:55,362 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:33:55,363 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:33:55,363 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:33:55,364 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:33:55,364 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-12 22:33:55,364 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:33:55,364 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:33:55,364 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:33:55,365 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:33:55,365 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:33:55,365 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:33:55,365 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-12 22:33:55,365 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:33:55,365 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:33:55,366 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:33:55,366 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:33:55,366 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:33:55,366 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:33:55,367 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:33:55,367 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:33:55,367 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:33:55,367 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:33:55,367 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:33:55,368 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:33:55,368 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:33:55,368 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:33:55,368 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:33:55,368 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_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be0a584ba9648c80e7a0523ff51ba530f1926c55cecd3c62f2cee05fbbff42e3 [2021-11-12 22:33:55,667 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:33:55,691 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:33:55,693 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:33:55,694 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:33:55,704 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:33:55,705 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/recursive/Fibonacci03.c [2021-11-12 22:33:55,779 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/data/d25314d56/d0cf3924d8af4d9f8ed728c453becc04/FLAG58a7e35b0 [2021-11-12 22:33:56,222 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:33:56,223 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/sv-benchmarks/c/recursive/Fibonacci03.c [2021-11-12 22:33:56,236 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/data/d25314d56/d0cf3924d8af4d9f8ed728c453becc04/FLAG58a7e35b0 [2021-11-12 22:33:56,607 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/data/d25314d56/d0cf3924d8af4d9f8ed728c453becc04 [2021-11-12 22:33:56,610 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:33:56,611 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:33:56,613 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:33:56,613 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:33:56,616 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:33:56,617 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b90c67b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56, skipping insertion in model container [2021-11-12 22:33:56,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,626 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:33:56,639 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:33:56,810 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/sv-benchmarks/c/recursive/Fibonacci03.c[788,801] [2021-11-12 22:33:56,811 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:33:56,820 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:33:56,833 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/sv-benchmarks/c/recursive/Fibonacci03.c[788,801] [2021-11-12 22:33:56,834 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:33:56,847 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:33:56,848 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56 WrapperNode [2021-11-12 22:33:56,848 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:33:56,849 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:33:56,849 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:33:56,849 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:33:56,855 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,861 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,879 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:33:56,880 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:33:56,880 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:33:56,880 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:33:56,888 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,889 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,890 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,890 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,894 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,896 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,897 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,899 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:33:56,899 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:33:56,900 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:33:56,900 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:33:56,901 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (1/1) ... [2021-11-12 22:33:56,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:33:56,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:33:56,932 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:33:56,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:33:56,964 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-12 22:33:56,964 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-12 22:33:56,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:33:56,965 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:33:56,965 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 22:33:56,965 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:33:57,204 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:33:57,204 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 22:33:57,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:33:57 BoogieIcfgContainer [2021-11-12 22:33:57,207 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:33:57,208 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:33:57,209 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:33:57,212 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:33:57,212 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:33:56" (1/3) ... [2021-11-12 22:33:57,213 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60e29137 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:33:57, skipping insertion in model container [2021-11-12 22:33:57,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:33:56" (2/3) ... [2021-11-12 22:33:57,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60e29137 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:33:57, skipping insertion in model container [2021-11-12 22:33:57,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:33:57" (3/3) ... [2021-11-12 22:33:57,215 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci03.c [2021-11-12 22:33:57,220 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:33:57,221 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-12 22:33:57,271 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:33:57,279 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 [2021-11-12 22:33:57,280 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-12 22:33:57,324 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 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) [2021-11-12 22:33:57,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-12 22:33:57,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:33:57,330 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:33:57,330 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:33:57,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:33:57,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1639303625, now seen corresponding path program 1 times [2021-11-12 22:33:57,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:33:57,359 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419121937] [2021-11-12 22:33:57,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:33:57,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:33:57,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:33:57,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:33:57,671 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:33:57,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419121937] [2021-11-12 22:33:57,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419121937] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:33:57,672 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:33:57,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:33:57,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274042363] [2021-11-12 22:33:57,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:33:57,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:33:57,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:33:57,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:33:57,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:33:57,724 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 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) [2021-11-12 22:33:57,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:33:57,856 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2021-11-12 22:33:57,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:33:57,859 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 [2021-11-12 22:33:57,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:33:57,866 INFO L225 Difference]: With dead ends: 29 [2021-11-12 22:33:57,867 INFO L226 Difference]: Without dead ends: 22 [2021-11-12 22:33:57,871 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:33:57,887 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 62.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.91ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 78.13ms IncrementalHoareTripleChecker+Time [2021-11-12 22:33:57,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 25 Invalid, 55 Unknown, 0 Unchecked, 6.91ms Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 78.13ms Time] [2021-11-12 22:33:57,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-12 22:33:57,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-12 22:33:57,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 18 states have internal predecessors, (20), 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) [2021-11-12 22:33:57,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-12 22:33:57,944 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 7 [2021-11-12 22:33:57,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:33:57,944 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-12 22:33:57,944 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) [2021-11-12 22:33:57,945 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-12 22:33:57,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-12 22:33:57,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:33:57,956 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:33:57,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 22:33:57,958 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:33:57,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:33:57,962 INFO L85 PathProgramCache]: Analyzing trace with hash -721195135, now seen corresponding path program 1 times [2021-11-12 22:33:57,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:33:57,963 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840939033] [2021-11-12 22:33:57,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:33:57,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:33:57,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:33:58,017 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:33:58,017 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:33:58,018 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840939033] [2021-11-12 22:33:58,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840939033] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:33:58,020 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:33:58,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 22:33:58,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341373891] [2021-11-12 22:33:58,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:33:58,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:33:58,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:33:58,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:33:58,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:33:58,030 INFO L87 Difference]: Start difference. First operand 22 states and 25 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) [2021-11-12 22:33:58,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:33:58,062 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-11-12 22:33:58,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:33:58,063 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 [2021-11-12 22:33:58,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:33:58,066 INFO L225 Difference]: With dead ends: 24 [2021-11-12 22:33:58,066 INFO L226 Difference]: Without dead ends: 22 [2021-11-12 22:33:58,071 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 [2021-11-12 22:33:58,073 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.95ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.58ms IncrementalHoareTripleChecker+Time [2021-11-12 22:33:58,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 24 Invalid, 11 Unknown, 0 Unchecked, 0.95ms Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 19.58ms Time] [2021-11-12 22:33:58,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-12 22:33:58,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2021-11-12 22:33:58,099 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) [2021-11-12 22:33:58,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-12 22:33:58,102 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 8 [2021-11-12 22:33:58,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:33:58,105 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-12 22:33:58,107 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) [2021-11-12 22:33:58,108 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-12 22:33:58,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-12 22:33:58,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:33:58,110 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:33:58,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-12 22:33:58,112 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:33:58,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:33:58,113 INFO L85 PathProgramCache]: Analyzing trace with hash -5479895, now seen corresponding path program 1 times [2021-11-12 22:33:58,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:33:58,118 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276326273] [2021-11-12 22:33:58,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:33:58,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:33:58,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:33:58,275 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:33:58,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:33:58,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276326273] [2021-11-12 22:33:58,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276326273] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:33:58,276 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:33:58,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:33:58,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038372048] [2021-11-12 22:33:58,277 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:33:58,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:33:58,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:33:58,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:33:58,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:33:58,279 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) [2021-11-12 22:33:58,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:33:58,328 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-12 22:33:58,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:33:58,329 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 29 [2021-11-12 22:33:58,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:33:58,332 INFO L225 Difference]: With dead ends: 36 [2021-11-12 22:33:58,332 INFO L226 Difference]: Without dead ends: 34 [2021-11-12 22:33:58,334 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 [2021-11-12 22:33:58,343 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 7 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.21ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.99ms IncrementalHoareTripleChecker+Time [2021-11-12 22:33:58,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 51 Invalid, 30 Unknown, 0 Unchecked, 1.21ms Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 34.99ms Time] [2021-11-12 22:33:58,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-12 22:33:58,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2021-11-12 22:33:58,357 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) [2021-11-12 22:33:58,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-12 22:33:58,363 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 29 [2021-11-12 22:33:58,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:33:58,364 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-12 22:33:58,365 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) [2021-11-12 22:33:58,365 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-12 22:33:58,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-12 22:33:58,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:33:58,369 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] [2021-11-12 22:33:58,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-12 22:33:58,370 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:33:58,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:33:58,382 INFO L85 PathProgramCache]: Analyzing trace with hash -158558097, now seen corresponding path program 1 times [2021-11-12 22:33:58,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:33:58,382 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841413924] [2021-11-12 22:33:58,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:33:58,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:33:58,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:33:58,500 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:33:58,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:33:58,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841413924] [2021-11-12 22:33:58,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841413924] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:33:58,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159286437] [2021-11-12 22:33:58,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:33:58,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:33:58,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:33:58,505 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:33:58,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 22:33:58,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:33:58,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:33:58,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:33:58,784 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:33:58,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:33:59,045 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:33:59,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [159286437] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:33:59,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1406294240] [2021-11-12 22:33:59,068 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-12 22:33:59,069 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:33:59,074 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) [2021-11-12 22:33:59,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:33:59,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2021-11-12 22:33:59,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466506253] [2021-11-12 22:33:59,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:33:59,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-12 22:33:59,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:33:59,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-12 22:33:59,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:33:59,082 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) [2021-11-12 22:33:59,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:33:59,396 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2021-11-12 22:33:59,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:33:59,397 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 [2021-11-12 22:33:59,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:33:59,401 INFO L225 Difference]: With dead ends: 90 [2021-11-12 22:33:59,401 INFO L226 Difference]: Without dead ends: 64 [2021-11-12 22:33:59,406 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-11-12 22:33:59,414 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 133 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 111.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.02ms SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 138.22ms IncrementalHoareTripleChecker+Time [2021-11-12 22:33:59,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 66 Invalid, 229 Unknown, 0 Unchecked, 11.02ms Time], IncrementalHoareTripleChecker [60 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 138.22ms Time] [2021-11-12 22:33:59,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-12 22:33:59,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2021-11-12 22:33:59,435 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) [2021-11-12 22:33:59,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-12 22:33:59,442 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 30 [2021-11-12 22:33:59,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:33:59,442 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-12 22:33:59,443 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) [2021-11-12 22:33:59,444 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-12 22:33:59,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-12 22:33:59,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:33:59,446 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] [2021-11-12 22:33:59,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:33:59,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:33:59,672 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:33:59,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:33:59,673 INFO L85 PathProgramCache]: Analyzing trace with hash -1851648215, now seen corresponding path program 2 times [2021-11-12 22:33:59,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:33:59,673 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122996332] [2021-11-12 22:33:59,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:33:59,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:33:59,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:33:59,736 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:33:59,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:33:59,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122996332] [2021-11-12 22:33:59,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122996332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:33:59,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15473463] [2021-11-12 22:33:59,737 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:33:59,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:33:59,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:33:59,738 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:33:59,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 22:33:59,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-12 22:33:59,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:33:59,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:33:59,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:33:59,889 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:33:59,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:33:59,967 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:33:59,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15473463] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:33:59,969 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:33:59,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 9 [2021-11-12 22:33:59,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367859617] [2021-11-12 22:33:59,970 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:33:59,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:33:59,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:33:59,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:33:59,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-12 22:33:59,972 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) [2021-11-12 22:34:00,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:00,025 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-11-12 22:34:00,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:34:00,026 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 [2021-11-12 22:34:00,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:00,029 INFO L225 Difference]: With dead ends: 60 [2021-11-12 22:34:00,029 INFO L226 Difference]: Without dead ends: 59 [2021-11-12 22:34:00,030 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 [2021-11-12 22:34:00,031 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 10 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.13ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.53ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:00,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 59 Invalid, 33 Unknown, 0 Unchecked, 1.13ms Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 24.53ms Time] [2021-11-12 22:34:00,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-12 22:34:00,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-11-12 22:34:00,047 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) [2021-11-12 22:34:00,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-11-12 22:34:00,048 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 24 [2021-11-12 22:34:00,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:00,049 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-11-12 22:34:00,049 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) [2021-11-12 22:34:00,049 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-11-12 22:34:00,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-12 22:34:00,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:00,050 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, 1] [2021-11-12 22:34:00,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:00,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:00,260 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:00,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:00,261 INFO L85 PathProgramCache]: Analyzing trace with hash -1566519763, now seen corresponding path program 1 times [2021-11-12 22:34:00,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:00,262 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709550651] [2021-11-12 22:34:00,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:00,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:00,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:00,318 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:34:00,319 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:00,319 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709550651] [2021-11-12 22:34:00,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709550651] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:00,319 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938824633] [2021-11-12 22:34:00,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:00,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:00,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:00,321 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:00,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 22:34:00,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:00,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:34:00,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:00,470 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:34:00,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:00,557 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:34:00,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938824633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:00,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708707774] [2021-11-12 22:34:00,560 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:00,560 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:00,561 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) [2021-11-12 22:34:00,561 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:00,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2021-11-12 22:34:00,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708294163] [2021-11-12 22:34:00,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:00,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:34:00,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:00,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:34:00,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:34:00,563 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) [2021-11-12 22:34:00,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:00,646 INFO L93 Difference]: Finished difference Result 69 states and 93 transitions. [2021-11-12 22:34:00,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 22:34:00,647 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 25 [2021-11-12 22:34:00,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:00,648 INFO L225 Difference]: With dead ends: 69 [2021-11-12 22:34:00,648 INFO L226 Difference]: Without dead ends: 68 [2021-11-12 22:34:00,649 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-12 22:34:00,650 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 15 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.89ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.63ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 52.02ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:00,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 134 Invalid, 79 Unknown, 0 Unchecked, 1.63ms Time], IncrementalHoareTripleChecker [7 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 52.02ms Time] [2021-11-12 22:34:00,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-12 22:34:00,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-11-12 22:34:00,660 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) [2021-11-12 22:34:00,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2021-11-12 22:34:00,662 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 25 [2021-11-12 22:34:00,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:00,662 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2021-11-12 22:34:00,662 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) [2021-11-12 22:34:00,663 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2021-11-12 22:34:00,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-12 22:34:00,665 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:00,665 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] [2021-11-12 22:34:00,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:00,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-12 22:34:00,886 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:00,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:00,887 INFO L85 PathProgramCache]: Analyzing trace with hash 824601704, now seen corresponding path program 1 times [2021-11-12 22:34:00,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:00,887 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19324025] [2021-11-12 22:34:00,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:00,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:00,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:00,991 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-12 22:34:00,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:00,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19324025] [2021-11-12 22:34:00,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19324025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:00,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251959937] [2021-11-12 22:34:00,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:00,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:00,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:00,993 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:01,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 22:34:01,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:01,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 22:34:01,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:01,204 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-12 22:34:01,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:01,458 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-12 22:34:01,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251959937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:01,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [626838004] [2021-11-12 22:34:01,463 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:01,463 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:01,464 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) [2021-11-12 22:34:01,465 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:01,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2021-11-12 22:34:01,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433940589] [2021-11-12 22:34:01,466 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:01,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-12 22:34:01,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:01,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-12 22:34:01,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:34:01,469 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) [2021-11-12 22:34:01,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:01,677 INFO L93 Difference]: Finished difference Result 134 states and 199 transitions. [2021-11-12 22:34:01,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-12 22:34:01,678 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 [2021-11-12 22:34:01,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:01,686 INFO L225 Difference]: With dead ends: 134 [2021-11-12 22:34:01,686 INFO L226 Difference]: Without dead ends: 133 [2021-11-12 22:34:01,688 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 [2021-11-12 22:34:01,689 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 43 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 83.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.03ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 101.01ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:01,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 191 Invalid, 168 Unknown, 0 Unchecked, 4.03ms Time], IncrementalHoareTripleChecker [16 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 101.01ms Time] [2021-11-12 22:34:01,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-12 22:34:01,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 98. [2021-11-12 22:34:01,732 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) [2021-11-12 22:34:01,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-12 22:34:01,734 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 50 [2021-11-12 22:34:01,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:01,735 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-12 22:34:01,735 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) [2021-11-12 22:34:01,735 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-12 22:34:01,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-12 22:34:01,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:01,740 INFO L514 BasicCegarLoop]: trace histogram [11, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1] [2021-11-12 22:34:01,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:01,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:01,963 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:01,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:01,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1744845591, now seen corresponding path program 1 times [2021-11-12 22:34:01,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:01,963 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464321543] [2021-11-12 22:34:01,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:01,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:02,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:02,082 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2021-11-12 22:34:02,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:02,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464321543] [2021-11-12 22:34:02,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [464321543] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:34:02,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:34:02,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:34:02,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741266465] [2021-11-12 22:34:02,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:34:02,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:34:02,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:02,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:34:02,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:34:02,085 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) [2021-11-12 22:34:02,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:02,117 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-12 22:34:02,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:34:02,118 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 97 [2021-11-12 22:34:02,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:02,120 INFO L225 Difference]: With dead ends: 111 [2021-11-12 22:34:02,122 INFO L226 Difference]: Without dead ends: 110 [2021-11-12 22:34:02,123 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 [2021-11-12 22:34:02,124 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.70ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.79ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:02,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 55 Invalid, 33 Unknown, 0 Unchecked, 0.70ms Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 21.79ms Time] [2021-11-12 22:34:02,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-12 22:34:02,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-12 22:34:02,144 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) [2021-11-12 22:34:02,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-12 22:34:02,149 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 97 [2021-11-12 22:34:02,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:02,150 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-12 22:34:02,150 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) [2021-11-12 22:34:02,150 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-12 22:34:02,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-12 22:34:02,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:02,156 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-12 22:34:02,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 22:34:02,157 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:02,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:02,157 INFO L85 PathProgramCache]: Analyzing trace with hash -1250907059, now seen corresponding path program 2 times [2021-11-12 22:34:02,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:02,157 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197062243] [2021-11-12 22:34:02,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:02,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:02,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:02,232 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-11-12 22:34:02,232 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:02,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197062243] [2021-11-12 22:34:02,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197062243] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:34:02,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:34:02,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:34:02,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902704786] [2021-11-12 22:34:02,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:34:02,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:34:02,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:02,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:34:02,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:34:02,234 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) [2021-11-12 22:34:02,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:02,260 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-12 22:34:02,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:34:02,260 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 70 [2021-11-12 22:34:02,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:02,262 INFO L225 Difference]: With dead ends: 111 [2021-11-12 22:34:02,262 INFO L226 Difference]: Without dead ends: 110 [2021-11-12 22:34:02,263 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 [2021-11-12 22:34:02,264 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.48ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.75ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:02,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 57 Invalid, 27 Unknown, 0 Unchecked, 0.48ms Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 17.75ms Time] [2021-11-12 22:34:02,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-12 22:34:02,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-12 22:34:02,275 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) [2021-11-12 22:34:02,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-12 22:34:02,277 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 70 [2021-11-12 22:34:02,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:02,278 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-12 22:34:02,278 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) [2021-11-12 22:34:02,278 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-12 22:34:02,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-12 22:34:02,280 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:02,280 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2021-11-12 22:34:02,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 22:34:02,281 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:02,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:02,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1001630528, now seen corresponding path program 2 times [2021-11-12 22:34:02,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:02,282 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598259881] [2021-11-12 22:34:02,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:02,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:02,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:02,496 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 56 proven. 165 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2021-11-12 22:34:02,497 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:02,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598259881] [2021-11-12 22:34:02,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598259881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:02,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227044083] [2021-11-12 22:34:02,497 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:34:02,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:02,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:02,498 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:02,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 22:34:02,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 22:34:02,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:34:02,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:34:02,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:02,856 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 184 proven. 85 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-11-12 22:34:02,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:03,483 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 184 proven. 88 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2021-11-12 22:34:03,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227044083] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:03,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [474354324] [2021-11-12 22:34:03,489 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:03,489 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:03,490 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) [2021-11-12 22:34:03,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:03,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 19 [2021-11-12 22:34:03,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411122450] [2021-11-12 22:34:03,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:03,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-12 22:34:03,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:03,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-12 22:34:03,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:34:03,495 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) [2021-11-12 22:34:03,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:03,905 INFO L93 Difference]: Finished difference Result 175 states and 303 transitions. [2021-11-12 22:34:03,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-12 22:34:03,906 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) Word has length 122 [2021-11-12 22:34:03,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:03,908 INFO L225 Difference]: With dead ends: 175 [2021-11-12 22:34:03,908 INFO L226 Difference]: Without dead ends: 80 [2021-11-12 22:34:03,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=254, Invalid=676, Unknown=0, NotChecked=0, Total=930 [2021-11-12 22:34:03,911 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 299 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 145.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.61ms SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 203.49ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:03,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [299 Valid, 75 Invalid, 324 Unknown, 0 Unchecked, 4.61ms Time], IncrementalHoareTripleChecker [135 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 203.49ms Time] [2021-11-12 22:34:03,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-12 22:34:03,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2021-11-12 22:34:03,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 55 states have internal predecessors, (62), 8 states have call successors, (8), 5 states have call predecessors, (8), 6 states have return successors, (17), 11 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-12 22:34:03,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2021-11-12 22:34:03,922 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 122 [2021-11-12 22:34:03,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:03,923 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2021-11-12 22:34:03,923 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) [2021-11-12 22:34:03,923 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2021-11-12 22:34:03,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-12 22:34:03,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:03,926 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-12 22:34:03,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:04,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-12 22:34:04,140 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:04,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:04,140 INFO L85 PathProgramCache]: Analyzing trace with hash 648182430, now seen corresponding path program 3 times [2021-11-12 22:34:04,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:04,141 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114288518] [2021-11-12 22:34:04,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:04,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:04,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:04,295 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 81 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-12 22:34:04,296 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:04,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114288518] [2021-11-12 22:34:04,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114288518] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:04,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638382455] [2021-11-12 22:34:04,296 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:34:04,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:04,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:04,297 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:04,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 22:34:04,342 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:34:04,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:34:04,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:34:04,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:04,532 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 123 proven. 37 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-12 22:34:04,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:05,109 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 88 proven. 62 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-12 22:34:05,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638382455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:05,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [450379534] [2021-11-12 22:34:05,114 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:05,114 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:05,114 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) [2021-11-12 22:34:05,115 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:05,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2021-11-12 22:34:05,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046200984] [2021-11-12 22:34:05,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:05,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-12 22:34:05,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:05,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-12 22:34:05,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:34:05,121 INFO L87 Difference]: Start difference. First operand 72 states and 87 transitions. Second operand has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-12 22:34:05,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:05,326 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2021-11-12 22:34:05,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:34:05,327 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) Word has length 84 [2021-11-12 22:34:05,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:05,328 INFO L225 Difference]: With dead ends: 131 [2021-11-12 22:34:05,328 INFO L226 Difference]: Without dead ends: 64 [2021-11-12 22:34:05,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 162 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2021-11-12 22:34:05,329 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 99 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 74.11ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.98ms SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 104.19ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:05,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 74 Invalid, 179 Unknown, 0 Unchecked, 1.98ms Time], IncrementalHoareTripleChecker [43 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 104.19ms Time] [2021-11-12 22:34:05,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-12 22:34:05,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-12 22:34:05,334 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) [2021-11-12 22:34:05,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-12 22:34:05,335 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 84 [2021-11-12 22:34:05,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:05,335 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-12 22:34:05,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-12 22:34:05,336 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-12 22:34:05,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-12 22:34:05,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:05,337 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2021-11-12 22:34:05,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:05,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-12 22:34:05,560 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:05,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:05,560 INFO L85 PathProgramCache]: Analyzing trace with hash -1892098066, now seen corresponding path program 3 times [2021-11-12 22:34:05,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:05,560 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323327969] [2021-11-12 22:34:05,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:05,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:05,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:05,701 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-12 22:34:05,701 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:05,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323327969] [2021-11-12 22:34:05,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323327969] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:05,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576313748] [2021-11-12 22:34:05,702 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:34:05,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:05,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:05,703 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:05,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 22:34:05,766 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:34:05,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:34:05,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:34:05,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:06,009 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-12 22:34:06,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:06,278 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-12 22:34:06,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576313748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:06,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1284520745] [2021-11-12 22:34:06,281 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:06,281 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:06,281 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) [2021-11-12 22:34:06,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:06,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 18 [2021-11-12 22:34:06,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299739488] [2021-11-12 22:34:06,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:06,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-12 22:34:06,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:06,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-12 22:34:06,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:34:06,285 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-12 22:34:06,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:06,400 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-11-12 22:34:06,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:34:06,400 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) Word has length 84 [2021-11-12 22:34:06,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:06,401 INFO L225 Difference]: With dead ends: 68 [2021-11-12 22:34:06,401 INFO L226 Difference]: Without dead ends: 67 [2021-11-12 22:34:06,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2021-11-12 22:34:06,403 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 58.46ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.07ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.44ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:06,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 185 Invalid, 141 Unknown, 0 Unchecked, 2.07ms Time], IncrementalHoareTripleChecker [14 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 70.44ms Time] [2021-11-12 22:34:06,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-12 22:34:06,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2021-11-12 22:34:06,407 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) [2021-11-12 22:34:06,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-11-12 22:34:06,408 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 84 [2021-11-12 22:34:06,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:06,409 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-11-12 22:34:06,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-12 22:34:06,409 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-11-12 22:34:06,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-12 22:34:06,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:06,411 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2021-11-12 22:34:06,451 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-12 22:34:06,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-12 22:34:06,628 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:06,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:06,628 INFO L85 PathProgramCache]: Analyzing trace with hash -30271424, now seen corresponding path program 4 times [2021-11-12 22:34:06,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:06,628 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927702470] [2021-11-12 22:34:06,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:06,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:06,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:06,763 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 142 proven. 168 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2021-11-12 22:34:06,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:06,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927702470] [2021-11-12 22:34:06,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927702470] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:06,764 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712015498] [2021-11-12 22:34:06,764 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:34:06,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:06,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:06,780 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:06,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 22:34:06,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:06,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:34:06,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:07,123 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 138 proven. 182 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-12 22:34:07,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:07,953 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 138 proven. 202 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2021-11-12 22:34:07,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712015498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:07,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [949911012] [2021-11-12 22:34:07,956 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:07,957 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:07,957 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) [2021-11-12 22:34:07,958 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:07,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 15] total 20 [2021-11-12 22:34:07,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372578311] [2021-11-12 22:34:07,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:07,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-12 22:34:07,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:07,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-12 22:34:07,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2021-11-12 22:34:07,961 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) [2021-11-12 22:34:08,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:08,259 INFO L93 Difference]: Finished difference Result 130 states and 155 transitions. [2021-11-12 22:34:08,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-12 22:34:08,260 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) Word has length 122 [2021-11-12 22:34:08,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:08,261 INFO L225 Difference]: With dead ends: 130 [2021-11-12 22:34:08,261 INFO L226 Difference]: Without dead ends: 72 [2021-11-12 22:34:08,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 238 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2021-11-12 22:34:08,262 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 135 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 139.24ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.34ms SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 165.46ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:08,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 98 Invalid, 303 Unknown, 0 Unchecked, 2.34ms Time], IncrementalHoareTripleChecker [87 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 165.46ms Time] [2021-11-12 22:34:08,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-12 22:34:08,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2021-11-12 22:34:08,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 53 states have internal predecessors, (58), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2021-11-12 22:34:08,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 79 transitions. [2021-11-12 22:34:08,269 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 79 transitions. Word has length 122 [2021-11-12 22:34:08,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:08,270 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 79 transitions. [2021-11-12 22:34:08,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) [2021-11-12 22:34:08,270 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 79 transitions. [2021-11-12 22:34:08,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2021-11-12 22:34:08,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:08,276 INFO L514 BasicCegarLoop]: trace histogram [30, 27, 24, 15, 15, 15, 15, 14, 14, 14, 14, 14, 13, 13, 12, 12, 9, 6, 1, 1, 1, 1] [2021-11-12 22:34:08,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:08,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-12 22:34:08,499 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:08,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:08,499 INFO L85 PathProgramCache]: Analyzing trace with hash 140047856, now seen corresponding path program 5 times [2021-11-12 22:34:08,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:08,499 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799146385] [2021-11-12 22:34:08,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:08,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:08,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:08,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2749 backedges. 224 proven. 971 refuted. 0 times theorem prover too weak. 1554 trivial. 0 not checked. [2021-11-12 22:34:08,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:08,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799146385] [2021-11-12 22:34:08,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799146385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:08,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243679392] [2021-11-12 22:34:08,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:34:08,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:08,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:08,707 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:08,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 22:34:08,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-12 22:34:08,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:34:08,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-12 22:34:08,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:09,627 INFO L134 CoverageAnalysis]: Checked inductivity of 2749 backedges. 747 proven. 217 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2021-11-12 22:34:09,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:11,587 INFO L134 CoverageAnalysis]: Checked inductivity of 2749 backedges. 861 proven. 190 refuted. 0 times theorem prover too weak. 1698 trivial. 0 not checked. [2021-11-12 22:34:11,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243679392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:11,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [250664514] [2021-11-12 22:34:11,590 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:11,590 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:11,590 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) [2021-11-12 22:34:11,591 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:11,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 20] total 38 [2021-11-12 22:34:11,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920732224] [2021-11-12 22:34:11,592 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:11,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-12 22:34:11,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:11,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-12 22:34:11,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1214, Unknown=0, NotChecked=0, Total=1406 [2021-11-12 22:34:11,595 INFO L87 Difference]: Start difference. First operand 69 states and 79 transitions. Second operand has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 16 states have call successors, (19), 3 states have call predecessors, (19), 13 states have return successors, (30), 25 states have call predecessors, (30), 14 states have call successors, (30) [2021-11-12 22:34:12,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:12,702 INFO L93 Difference]: Finished difference Result 194 states and 253 transitions. [2021-11-12 22:34:12,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-12 22:34:12,703 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 16 states have call successors, (19), 3 states have call predecessors, (19), 13 states have return successors, (30), 25 states have call predecessors, (30), 14 states have call successors, (30) Word has length 280 [2021-11-12 22:34:12,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:12,704 INFO L225 Difference]: With dead ends: 194 [2021-11-12 22:34:12,704 INFO L226 Difference]: Without dead ends: 130 [2021-11-12 22:34:12,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 545 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1474 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=890, Invalid=4366, Unknown=0, NotChecked=0, Total=5256 [2021-11-12 22:34:12,709 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 238 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 314.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.96ms SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 378.19ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:12,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 90 Invalid, 709 Unknown, 0 Unchecked, 4.96ms Time], IncrementalHoareTripleChecker [135 Valid, 574 Invalid, 0 Unknown, 0 Unchecked, 378.19ms Time] [2021-11-12 22:34:12,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-12 22:34:12,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 102. [2021-11-12 22:34:12,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 81 states have (on average 1.037037037037037) internal successors, (84), 79 states have internal predecessors, (84), 12 states have call successors, (12), 8 states have call predecessors, (12), 8 states have return successors, (34), 14 states have call predecessors, (34), 11 states have call successors, (34) [2021-11-12 22:34:12,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 130 transitions. [2021-11-12 22:34:12,719 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 130 transitions. Word has length 280 [2021-11-12 22:34:12,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:12,719 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 130 transitions. [2021-11-12 22:34:12,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 16 states have call successors, (19), 3 states have call predecessors, (19), 13 states have return successors, (30), 25 states have call predecessors, (30), 14 states have call successors, (30) [2021-11-12 22:34:12,720 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 130 transitions. [2021-11-12 22:34:12,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-12 22:34:12,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:12,725 INFO L514 BasicCegarLoop]: trace histogram [32, 30, 26, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 14, 14, 10, 6, 1, 1, 1, 1] [2021-11-12 22:34:12,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:12,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-12 22:34:12,948 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:12,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:12,948 INFO L85 PathProgramCache]: Analyzing trace with hash 1950560215, now seen corresponding path program 6 times [2021-11-12 22:34:12,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:12,948 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748720302] [2021-11-12 22:34:12,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:12,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:12,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:13,151 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 507 proven. 1076 refuted. 0 times theorem prover too weak. 1685 trivial. 0 not checked. [2021-11-12 22:34:13,151 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:13,151 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748720302] [2021-11-12 22:34:13,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748720302] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:13,152 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499539787] [2021-11-12 22:34:13,152 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:34:13,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:13,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:13,153 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:13,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-12 22:34:13,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:34:13,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:34:13,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-12 22:34:13,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:13,819 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 599 proven. 1181 refuted. 0 times theorem prover too weak. 1488 trivial. 0 not checked. [2021-11-12 22:34:13,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:15,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 599 proven. 1253 refuted. 0 times theorem prover too weak. 1416 trivial. 0 not checked. [2021-11-12 22:34:15,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499539787] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:15,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1879375891] [2021-11-12 22:34:15,746 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:15,746 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:15,747 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) [2021-11-12 22:34:15,748 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:15,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2021-11-12 22:34:15,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103398727] [2021-11-12 22:34:15,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:15,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-12 22:34:15,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:15,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-12 22:34:15,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2021-11-12 22:34:15,751 INFO L87 Difference]: Start difference. First operand 102 states and 130 transitions. Second operand has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-12 22:34:16,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:16,361 INFO L93 Difference]: Finished difference Result 238 states and 327 transitions. [2021-11-12 22:34:16,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-12 22:34:16,362 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) Word has length 305 [2021-11-12 22:34:16,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:16,364 INFO L225 Difference]: With dead ends: 238 [2021-11-12 22:34:16,364 INFO L226 Difference]: Without dead ends: 141 [2021-11-12 22:34:16,374 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 604 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=604, Invalid=1748, Unknown=0, NotChecked=0, Total=2352 [2021-11-12 22:34:16,375 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 422 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 264 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 243.64ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.63ms SdHoareTripleChecker+Time, 264 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 309.12ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:16,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 125 Invalid, 620 Unknown, 0 Unchecked, 3.63ms Time], IncrementalHoareTripleChecker [264 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 309.12ms Time] [2021-11-12 22:34:16,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-12 22:34:16,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 128. [2021-11-12 22:34:16,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 99 states have internal predecessors, (108), 15 states have call successors, (15), 11 states have call predecessors, (15), 9 states have return successors, (37), 17 states have call predecessors, (37), 14 states have call successors, (37) [2021-11-12 22:34:16,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 160 transitions. [2021-11-12 22:34:16,387 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 160 transitions. Word has length 305 [2021-11-12 22:34:16,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:16,387 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 160 transitions. [2021-11-12 22:34:16,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-12 22:34:16,388 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 160 transitions. [2021-11-12 22:34:16,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 576 [2021-11-12 22:34:16,406 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:16,406 INFO L514 BasicCegarLoop]: trace histogram [60, 57, 49, 30, 30, 30, 30, 29, 29, 29, 29, 29, 28, 28, 27, 27, 19, 11, 1, 1, 1, 1] [2021-11-12 22:34:16,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:16,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-12 22:34:16,620 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:16,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:16,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1571931249, now seen corresponding path program 7 times [2021-11-12 22:34:16,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:16,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933550830] [2021-11-12 22:34:16,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:16,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:16,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:16,948 INFO L134 CoverageAnalysis]: Checked inductivity of 11944 backedges. 1134 proven. 2819 refuted. 0 times theorem prover too weak. 7991 trivial. 0 not checked. [2021-11-12 22:34:16,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:16,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933550830] [2021-11-12 22:34:16,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933550830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:16,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397046920] [2021-11-12 22:34:16,948 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:34:16,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:16,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:16,949 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:16,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 22:34:17,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:17,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 1094 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-12 22:34:17,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:18,109 INFO L134 CoverageAnalysis]: Checked inductivity of 11944 backedges. 3186 proven. 2833 refuted. 0 times theorem prover too weak. 5925 trivial. 0 not checked. [2021-11-12 22:34:18,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:20,619 INFO L134 CoverageAnalysis]: Checked inductivity of 11944 backedges. 1414 proven. 3337 refuted. 0 times theorem prover too weak. 7193 trivial. 0 not checked. [2021-11-12 22:34:20,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397046920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:20,619 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [897746298] [2021-11-12 22:34:20,621 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:20,622 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:20,622 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) [2021-11-12 22:34:20,622 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:20,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 25] total 30 [2021-11-12 22:34:20,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639873194] [2021-11-12 22:34:20,623 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:20,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-12 22:34:20,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:20,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-12 22:34:20,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=730, Unknown=0, NotChecked=0, Total=870 [2021-11-12 22:34:20,626 INFO L87 Difference]: Start difference. First operand 128 states and 160 transitions. Second operand has 30 states, 30 states have (on average 5.966666666666667) internal successors, (179), 30 states have internal predecessors, (179), 25 states have call successors, (32), 4 states have call predecessors, (32), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) [2021-11-12 22:34:21,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:21,411 INFO L93 Difference]: Finished difference Result 298 states and 410 transitions. [2021-11-12 22:34:21,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-12 22:34:21,412 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.966666666666667) internal successors, (179), 30 states have internal predecessors, (179), 25 states have call successors, (32), 4 states have call predecessors, (32), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) Word has length 575 [2021-11-12 22:34:21,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:21,417 INFO L225 Difference]: With dead ends: 298 [2021-11-12 22:34:21,418 INFO L226 Difference]: Without dead ends: 175 [2021-11-12 22:34:21,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1203 GetRequests, 1147 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=796, Invalid=2284, Unknown=0, NotChecked=0, Total=3080 [2021-11-12 22:34:21,426 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 633 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 384 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 275.44ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 633 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.45ms SdHoareTripleChecker+Time, 384 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 382.18ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:21,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [633 Valid, 116 Invalid, 716 Unknown, 0 Unchecked, 5.45ms Time], IncrementalHoareTripleChecker [384 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 382.18ms Time] [2021-11-12 22:34:21,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-12 22:34:21,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 152. [2021-11-12 22:34:21,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 123 states have (on average 1.056910569105691) internal successors, (130), 118 states have internal predecessors, (130), 18 states have call successors, (18), 14 states have call predecessors, (18), 10 states have return successors, (49), 19 states have call predecessors, (49), 17 states have call successors, (49) [2021-11-12 22:34:21,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 197 transitions. [2021-11-12 22:34:21,450 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 197 transitions. Word has length 575 [2021-11-12 22:34:21,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:21,452 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 197 transitions. [2021-11-12 22:34:21,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.966666666666667) internal successors, (179), 30 states have internal predecessors, (179), 25 states have call successors, (32), 4 states have call predecessors, (32), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) [2021-11-12 22:34:21,452 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 197 transitions. [2021-11-12 22:34:21,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2021-11-12 22:34:21,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:21,457 INFO L514 BasicCegarLoop]: trace histogram [34, 32, 28, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 15, 15, 11, 6, 1, 1, 1, 1] [2021-11-12 22:34:21,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:21,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:21,660 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:21,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:21,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1234401712, now seen corresponding path program 8 times [2021-11-12 22:34:21,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:21,660 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754386755] [2021-11-12 22:34:21,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:21,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:21,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:21,831 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 787 proven. 390 refuted. 0 times theorem prover too weak. 2548 trivial. 0 not checked. [2021-11-12 22:34:21,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:21,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754386755] [2021-11-12 22:34:21,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754386755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:21,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948442773] [2021-11-12 22:34:21,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:34:21,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:21,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:21,840 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:21,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-12 22:34:21,993 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-12 22:34:21,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:34:21,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:34:22,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:22,521 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 842 proven. 213 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2021-11-12 22:34:22,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:23,660 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 842 proven. 226 refuted. 0 times theorem prover too weak. 2657 trivial. 0 not checked. [2021-11-12 22:34:23,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948442773] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:23,661 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1829973362] [2021-11-12 22:34:23,663 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:23,663 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:23,663 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) [2021-11-12 22:34:23,664 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:23,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 13] total 20 [2021-11-12 22:34:23,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446301763] [2021-11-12 22:34:23,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:23,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-12 22:34:23,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:23,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-12 22:34:23,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2021-11-12 22:34:23,668 INFO L87 Difference]: Start difference. First operand 152 states and 197 transitions. Second operand has 20 states, 20 states have (on average 5.1) internal successors, (102), 20 states have internal predecessors, (102), 9 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (20), 14 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-12 22:34:24,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:24,032 INFO L93 Difference]: Finished difference Result 291 states and 398 transitions. [2021-11-12 22:34:24,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-12 22:34:24,032 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.1) internal successors, (102), 20 states have internal predecessors, (102), 9 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (20), 14 states have call predecessors, (20), 9 states have call successors, (20) Word has length 325 [2021-11-12 22:34:24,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:24,035 INFO L225 Difference]: With dead ends: 291 [2021-11-12 22:34:24,035 INFO L226 Difference]: Without dead ends: 144 [2021-11-12 22:34:24,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 644 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=274, Invalid=656, Unknown=0, NotChecked=0, Total=930 [2021-11-12 22:34:24,038 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 152 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 177.80ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.70ms SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 213.20ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:24,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 142 Invalid, 432 Unknown, 0 Unchecked, 2.70ms Time], IncrementalHoareTripleChecker [98 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 213.20ms Time] [2021-11-12 22:34:24,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-12 22:34:24,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 135. [2021-11-12 22:34:24,050 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) [2021-11-12 22:34:24,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 169 transitions. [2021-11-12 22:34:24,052 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 169 transitions. Word has length 325 [2021-11-12 22:34:24,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:24,053 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 169 transitions. [2021-11-12 22:34:24,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.1) internal successors, (102), 20 states have internal predecessors, (102), 9 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (20), 14 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-12 22:34:24,053 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 169 transitions. [2021-11-12 22:34:24,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2021-11-12 22:34:24,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:24,056 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] [2021-11-12 22:34:24,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:24,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-12 22:34:24,272 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:24,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:24,272 INFO L85 PathProgramCache]: Analyzing trace with hash 1012331071, now seen corresponding path program 9 times [2021-11-12 22:34:24,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:24,272 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919166507] [2021-11-12 22:34:24,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:24,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:24,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:24,494 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 764 proven. 1095 refuted. 0 times theorem prover too weak. 2324 trivial. 0 not checked. [2021-11-12 22:34:24,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:24,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919166507] [2021-11-12 22:34:24,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919166507] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:24,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618623358] [2021-11-12 22:34:24,495 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:34:24,495 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:24,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:24,496 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:24,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-12 22:34:24,627 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:34:24,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:34:24,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-12 22:34:24,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:25,170 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 884 proven. 1214 refuted. 0 times theorem prover too weak. 2085 trivial. 0 not checked. [2021-11-12 22:34:25,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:27,048 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 884 proven. 1290 refuted. 0 times theorem prover too weak. 2009 trivial. 0 not checked. [2021-11-12 22:34:27,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618623358] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:27,051 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [62004029] [2021-11-12 22:34:27,060 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:27,060 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:27,062 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) [2021-11-12 22:34:27,063 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:27,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2021-11-12 22:34:27,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034805153] [2021-11-12 22:34:27,063 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:27,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-12 22:34:27,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:27,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-12 22:34:27,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-11-12 22:34:27,066 INFO L87 Difference]: Start difference. First operand 135 states and 169 transitions. Second operand has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-12 22:34:27,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:27,608 INFO L93 Difference]: Finished difference Result 278 states and 363 transitions. [2021-11-12 22:34:27,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-12 22:34:27,609 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) Word has length 344 [2021-11-12 22:34:27,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:27,611 INFO L225 Difference]: With dead ends: 278 [2021-11-12 22:34:27,611 INFO L226 Difference]: Without dead ends: 148 [2021-11-12 22:34:27,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 723 GetRequests, 680 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2021-11-12 22:34:27,614 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 230 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 262.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.53ms SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 339.50ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:27,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [230 Valid, 179 Invalid, 743 Unknown, 0 Unchecked, 5.53ms Time], IncrementalHoareTripleChecker [231 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 339.50ms Time] [2021-11-12 22:34:27,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-12 22:34:27,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 124. [2021-11-12 22:34:27,622 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) [2021-11-12 22:34:27,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 153 transitions. [2021-11-12 22:34:27,624 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 153 transitions. Word has length 344 [2021-11-12 22:34:27,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:27,625 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 153 transitions. [2021-11-12 22:34:27,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-12 22:34:27,625 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 153 transitions. [2021-11-12 22:34:27,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2021-11-12 22:34:27,628 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:27,628 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 33, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 19, 13, 8, 1, 1, 1, 1] [2021-11-12 22:34:27,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:27,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-12 22:34:27,848 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:27,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:27,849 INFO L85 PathProgramCache]: Analyzing trace with hash 815442872, now seen corresponding path program 10 times [2021-11-12 22:34:27,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:27,849 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879085641] [2021-11-12 22:34:27,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:27,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:27,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:28,257 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 830 proven. 1451 refuted. 0 times theorem prover too weak. 3328 trivial. 0 not checked. [2021-11-12 22:34:28,257 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:28,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879085641] [2021-11-12 22:34:28,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879085641] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:28,258 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471257453] [2021-11-12 22:34:28,258 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:34:28,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:28,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:28,259 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:28,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-12 22:34:28,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:28,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 766 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-12 22:34:28,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:29,417 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 820 proven. 1093 refuted. 0 times theorem prover too weak. 3696 trivial. 0 not checked. [2021-11-12 22:34:29,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:35,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 1149 proven. 996 refuted. 0 times theorem prover too weak. 3464 trivial. 0 not checked. [2021-11-12 22:34:35,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471257453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:35,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211038334] [2021-11-12 22:34:35,120 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:35,120 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:35,120 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) [2021-11-12 22:34:35,120 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:35,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2021-11-12 22:34:35,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117878099] [2021-11-12 22:34:35,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:35,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-12 22:34:35,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:35,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-12 22:34:35,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2021-11-12 22:34:35,124 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) [2021-11-12 22:34:35,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:35,336 INFO L93 Difference]: Finished difference Result 155 states and 205 transitions. [2021-11-12 22:34:35,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-12 22:34:35,337 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 397 [2021-11-12 22:34:35,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:35,339 INFO L225 Difference]: With dead ends: 155 [2021-11-12 22:34:35,339 INFO L226 Difference]: Without dead ends: 154 [2021-11-12 22:34:35,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 877 GetRequests, 829 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1002 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2021-11-12 22:34:35,341 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 82 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 105.89ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.01ms SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 128.36ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:35,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 246 Invalid, 207 Unknown, 0 Unchecked, 3.01ms Time], IncrementalHoareTripleChecker [39 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 128.36ms Time] [2021-11-12 22:34:35,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-12 22:34:35,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 144. [2021-11-12 22:34:35,351 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) [2021-11-12 22:34:35,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 191 transitions. [2021-11-12 22:34:35,354 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 191 transitions. Word has length 397 [2021-11-12 22:34:35,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:35,355 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 191 transitions. [2021-11-12 22:34:35,355 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) [2021-11-12 22:34:35,355 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 191 transitions. [2021-11-12 22:34:35,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1241 [2021-11-12 22:34:35,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:35,394 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] [2021-11-12 22:34:35,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:35,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:35,620 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:35,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:35,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1958598376, now seen corresponding path program 11 times [2021-11-12 22:34:35,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:35,621 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456658258] [2021-11-12 22:34:35,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:35,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:35,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:36,206 INFO L134 CoverageAnalysis]: Checked inductivity of 56407 backedges. 2116 proven. 8179 refuted. 0 times theorem prover too weak. 46112 trivial. 0 not checked. [2021-11-12 22:34:36,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:36,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456658258] [2021-11-12 22:34:36,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456658258] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:36,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186257265] [2021-11-12 22:34:36,207 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:34:36,207 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:36,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:36,208 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:36,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-12 22:34:36,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2021-11-12 22:34:36,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:34:36,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 1571 conjuncts, 165 conjunts are in the unsatisfiable core [2021-11-12 22:34:36,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:34:39,286 INFO L134 CoverageAnalysis]: Checked inductivity of 56407 backedges. 16340 proven. 4556 refuted. 0 times theorem prover too weak. 35511 trivial. 0 not checked. [2021-11-12 22:34:39,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:34:56,492 INFO L134 CoverageAnalysis]: Checked inductivity of 56407 backedges. 17207 proven. 4221 refuted. 0 times theorem prover too weak. 34979 trivial. 0 not checked. [2021-11-12 22:34:56,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186257265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:34:56,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1724672919] [2021-11-12 22:34:56,496 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:34:56,496 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:34:56,496 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) [2021-11-12 22:34:56,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:34:56,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 38] total 64 [2021-11-12 22:34:56,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726577191] [2021-11-12 22:34:56,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:34:56,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-12 22:34:56,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:34:56,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-12 22:34:56,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=3490, Unknown=0, NotChecked=0, Total=4032 [2021-11-12 22:34:56,505 INFO L87 Difference]: Start difference. First operand 144 states and 191 transitions. Second operand has 64 states, 64 states have (on average 3.359375) internal successors, (215), 64 states have internal predecessors, (215), 26 states have call successors, (30), 5 states have call predecessors, (30), 22 states have return successors, (51), 44 states have call predecessors, (51), 22 states have call successors, (51) [2021-11-12 22:34:59,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:34:59,043 INFO L93 Difference]: Finished difference Result 389 states and 599 transitions. [2021-11-12 22:34:59,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-12 22:34:59,044 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.359375) internal successors, (215), 64 states have internal predecessors, (215), 26 states have call successors, (30), 5 states have call predecessors, (30), 22 states have return successors, (51), 44 states have call predecessors, (51), 22 states have call successors, (51) Word has length 1240 [2021-11-12 22:34:59,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:34:59,048 INFO L225 Difference]: With dead ends: 389 [2021-11-12 22:34:59,048 INFO L226 Difference]: Without dead ends: 250 [2021-11-12 22:34:59,057 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2578 GetRequests, 2450 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5594 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2538, Invalid=14232, Unknown=0, NotChecked=0, Total=16770 [2021-11-12 22:34:59,061 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 584 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 1130 mSolverCounterSat, 391 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 595.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 584 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 1521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.62ms SdHoareTripleChecker+Time, 391 IncrementalHoareTripleChecker+Valid, 1130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 728.33ms IncrementalHoareTripleChecker+Time [2021-11-12 22:34:59,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [584 Valid, 125 Invalid, 1521 Unknown, 0 Unchecked, 7.62ms Time], IncrementalHoareTripleChecker [391 Valid, 1130 Invalid, 0 Unknown, 0 Unchecked, 728.33ms Time] [2021-11-12 22:34:59,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-11-12 22:34:59,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 218. [2021-11-12 22:34:59,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 175 states have (on average 1.0285714285714285) internal successors, (180), 171 states have internal predecessors, (180), 27 states have call successors, (27), 17 states have call predecessors, (27), 15 states have return successors, (108), 29 states have call predecessors, (108), 26 states have call successors, (108) [2021-11-12 22:34:59,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 315 transitions. [2021-11-12 22:34:59,093 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 315 transitions. Word has length 1240 [2021-11-12 22:34:59,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:34:59,094 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 315 transitions. [2021-11-12 22:34:59,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 3.359375) internal successors, (215), 64 states have internal predecessors, (215), 26 states have call successors, (30), 5 states have call predecessors, (30), 22 states have return successors, (51), 44 states have call predecessors, (51), 22 states have call successors, (51) [2021-11-12 22:34:59,095 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 315 transitions. [2021-11-12 22:34:59,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1130 [2021-11-12 22:34:59,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:34:59,111 INFO L514 BasicCegarLoop]: trace histogram [116, 114, 94, 58, 58, 58, 58, 57, 57, 57, 57, 57, 57, 57, 56, 56, 36, 22, 1, 1, 1, 1] [2021-11-12 22:34:59,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-12 22:34:59,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:59,340 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:34:59,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:34:59,340 INFO L85 PathProgramCache]: Analyzing trace with hash -343092137, now seen corresponding path program 12 times [2021-11-12 22:34:59,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:34:59,341 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023398238] [2021-11-12 22:34:59,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:34:59,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:34:59,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:34:59,870 INFO L134 CoverageAnalysis]: Checked inductivity of 46668 backedges. 5654 proven. 2561 refuted. 0 times theorem prover too weak. 38453 trivial. 0 not checked. [2021-11-12 22:34:59,870 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:34:59,870 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023398238] [2021-11-12 22:34:59,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023398238] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:34:59,870 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348196351] [2021-11-12 22:34:59,871 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:34:59,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:34:59,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:34:59,872 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:34:59,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-12 22:35:00,443 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:35:00,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:35:00,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 1402 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-12 22:35:00,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:02,063 INFO L134 CoverageAnalysis]: Checked inductivity of 46668 backedges. 25539 proven. 2667 refuted. 0 times theorem prover too weak. 18462 trivial. 0 not checked. [2021-11-12 22:35:02,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:07,534 INFO L134 CoverageAnalysis]: Checked inductivity of 46668 backedges. 3299 proven. 8582 refuted. 0 times theorem prover too weak. 34787 trivial. 0 not checked. [2021-11-12 22:35:07,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348196351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:07,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202591976] [2021-11-12 22:35:07,537 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:35:07,537 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:35:07,538 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) [2021-11-12 22:35:07,539 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:35:07,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 27] total 32 [2021-11-12 22:35:07,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579645235] [2021-11-12 22:35:07,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:35:07,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-12 22:35:07,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:35:07,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-12 22:35:07,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2021-11-12 22:35:07,544 INFO L87 Difference]: Start difference. First operand 218 states and 315 transitions. Second operand has 32 states, 32 states have (on average 5.875) internal successors, (188), 32 states have internal predecessors, (188), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) [2021-11-12 22:35:08,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:08,219 INFO L93 Difference]: Finished difference Result 414 states and 635 transitions. [2021-11-12 22:35:08,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-12 22:35:08,220 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.875) internal successors, (188), 32 states have internal predecessors, (188), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) Word has length 1129 [2021-11-12 22:35:08,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:08,223 INFO L225 Difference]: With dead ends: 414 [2021-11-12 22:35:08,223 INFO L226 Difference]: Without dead ends: 201 [2021-11-12 22:35:08,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2298 GetRequests, 2248 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=632, Invalid=1818, Unknown=0, NotChecked=0, Total=2450 [2021-11-12 22:35:08,228 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 353 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 296 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 326.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 353 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.41ms SdHoareTripleChecker+Time, 296 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 400.78ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:08,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [353 Valid, 209 Invalid, 891 Unknown, 0 Unchecked, 4.41ms Time], IncrementalHoareTripleChecker [296 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 400.78ms Time] [2021-11-12 22:35:08,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-12 22:35:08,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 165. [2021-11-12 22:35:08,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 130 states have internal predecessors, (135), 21 states have call successors, (21), 14 states have call predecessors, (21), 11 states have return successors, (67), 20 states have call predecessors, (67), 20 states have call successors, (67) [2021-11-12 22:35:08,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 223 transitions. [2021-11-12 22:35:08,242 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 223 transitions. Word has length 1129 [2021-11-12 22:35:08,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:08,243 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 223 transitions. [2021-11-12 22:35:08,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.875) internal successors, (188), 32 states have internal predecessors, (188), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) [2021-11-12 22:35:08,244 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 223 transitions. [2021-11-12 22:35:08,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1994 [2021-11-12 22:35:08,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:08,276 INFO L514 BasicCegarLoop]: trace histogram [205, 201, 166, 103, 103, 103, 103, 101, 101, 101, 101, 101, 100, 100, 99, 99, 63, 39, 1, 1, 1, 1] [2021-11-12 22:35:08,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:08,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-12 22:35:08,484 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:35:08,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:08,485 INFO L85 PathProgramCache]: Analyzing trace with hash -1713364761, now seen corresponding path program 13 times [2021-11-12 22:35:08,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:35:08,485 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159710501] [2021-11-12 22:35:08,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:08,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:35:08,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:09,528 INFO L134 CoverageAnalysis]: Checked inductivity of 146425 backedges. 4142 proven. 16900 refuted. 0 times theorem prover too weak. 125383 trivial. 0 not checked. [2021-11-12 22:35:09,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:35:09,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159710501] [2021-11-12 22:35:09,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159710501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:35:09,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805180475] [2021-11-12 22:35:09,529 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:35:09,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:09,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:35:09,532 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:35:09,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-12 22:35:10,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:10,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 3712 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-12 22:35:10,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:13,353 INFO L134 CoverageAnalysis]: Checked inductivity of 146425 backedges. 69781 proven. 10760 refuted. 0 times theorem prover too weak. 65884 trivial. 0 not checked. [2021-11-12 22:35:13,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:19,735 INFO L134 CoverageAnalysis]: Checked inductivity of 146425 backedges. 5043 proven. 19313 refuted. 0 times theorem prover too weak. 122069 trivial. 0 not checked. [2021-11-12 22:35:19,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1805180475] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:19,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [67299942] [2021-11-12 22:35:19,739 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:35:19,739 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:35:19,739 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) [2021-11-12 22:35:19,740 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:35:19,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 32] total 37 [2021-11-12 22:35:19,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934484191] [2021-11-12 22:35:19,742 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:35:19,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-12 22:35:19,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:35:19,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-12 22:35:19,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1132, Unknown=0, NotChecked=0, Total=1332 [2021-11-12 22:35:19,748 INFO L87 Difference]: Start difference. First operand 165 states and 223 transitions. Second operand has 37 states, 37 states have (on average 5.945945945945946) internal successors, (220), 37 states have internal predecessors, (220), 32 states have call successors, (39), 5 states have call predecessors, (39), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2021-11-12 22:35:20,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:20,928 INFO L93 Difference]: Finished difference Result 409 states and 600 transitions. [2021-11-12 22:35:20,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-12 22:35:20,931 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 5.945945945945946) internal successors, (220), 37 states have internal predecessors, (220), 32 states have call successors, (39), 5 states have call predecessors, (39), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) Word has length 1993 [2021-11-12 22:35:20,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:20,935 INFO L225 Difference]: With dead ends: 409 [2021-11-12 22:35:20,936 INFO L226 Difference]: Without dead ends: 249 [2021-11-12 22:35:20,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4062 GetRequests, 3983 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1428 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1530, Invalid=4632, Unknown=0, NotChecked=0, Total=6162 [2021-11-12 22:35:20,941 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 866 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 518 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 384.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 866 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 1056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.95ms SdHoareTripleChecker+Time, 518 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 471.21ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:20,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [866 Valid, 179 Invalid, 1056 Unknown, 0 Unchecked, 4.95ms Time], IncrementalHoareTripleChecker [518 Valid, 538 Invalid, 0 Unknown, 0 Unchecked, 471.21ms Time] [2021-11-12 22:35:20,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-11-12 22:35:20,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 209. [2021-11-12 22:35:20,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 169 states have (on average 1.029585798816568) internal successors, (174), 165 states have internal predecessors, (174), 27 states have call successors, (27), 20 states have call predecessors, (27), 12 states have return successors, (79), 23 states have call predecessors, (79), 26 states have call successors, (79) [2021-11-12 22:35:20,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 280 transitions. [2021-11-12 22:35:20,959 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 280 transitions. Word has length 1993 [2021-11-12 22:35:20,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:20,960 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 280 transitions. [2021-11-12 22:35:20,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 5.945945945945946) internal successors, (220), 37 states have internal predecessors, (220), 32 states have call successors, (39), 5 states have call predecessors, (39), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2021-11-12 22:35:20,961 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 280 transitions. [2021-11-12 22:35:20,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1575 [2021-11-12 22:35:20,982 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:20,983 INFO L514 BasicCegarLoop]: trace histogram [161, 160, 130, 80, 80, 80, 80, 80, 80, 80, 80, 80, 80, 80, 79, 79, 50, 31, 1, 1, 1, 1] [2021-11-12 22:35:21,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:21,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-12 22:35:21,198 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:35:21,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:21,198 INFO L85 PathProgramCache]: Analyzing trace with hash 703622336, now seen corresponding path program 14 times [2021-11-12 22:35:21,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:35:21,199 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460093627] [2021-11-12 22:35:21,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:21,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:35:21,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:22,043 INFO L134 CoverageAnalysis]: Checked inductivity of 91106 backedges. 6210 proven. 12368 refuted. 0 times theorem prover too weak. 72528 trivial. 0 not checked. [2021-11-12 22:35:22,043 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:35:22,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460093627] [2021-11-12 22:35:22,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [460093627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:35:22,044 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202251425] [2021-11-12 22:35:22,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:35:22,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:22,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:35:22,045 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:35:22,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-12 22:35:22,813 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-11-12 22:35:22,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:35:22,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 1326 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-12 22:35:22,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:25,301 INFO L134 CoverageAnalysis]: Checked inductivity of 91106 backedges. 6282 proven. 9130 refuted. 0 times theorem prover too weak. 75694 trivial. 0 not checked. [2021-11-12 22:35:25,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:31,429 INFO L134 CoverageAnalysis]: Checked inductivity of 91106 backedges. 6275 proven. 9282 refuted. 0 times theorem prover too weak. 75549 trivial. 0 not checked. [2021-11-12 22:35:31,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202251425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:31,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [460564871] [2021-11-12 22:35:31,434 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:35:31,435 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:35:31,435 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) [2021-11-12 22:35:31,436 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:35:31,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 28] total 36 [2021-11-12 22:35:31,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063657096] [2021-11-12 22:35:31,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:35:31,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-12 22:35:31,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:35:31,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-12 22:35:31,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=1041, Unknown=0, NotChecked=0, Total=1260 [2021-11-12 22:35:31,446 INFO L87 Difference]: Start difference. First operand 209 states and 280 transitions. Second operand has 36 states, 36 states have (on average 6.111111111111111) internal successors, (220), 36 states have internal predecessors, (220), 30 states have call successors, (38), 1 states have call predecessors, (38), 18 states have return successors, (54), 23 states have call predecessors, (54), 30 states have call successors, (54) [2021-11-12 22:35:32,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:32,434 INFO L93 Difference]: Finished difference Result 435 states and 616 transitions. [2021-11-12 22:35:32,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-12 22:35:32,435 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 6.111111111111111) internal successors, (220), 36 states have internal predecessors, (220), 30 states have call successors, (38), 1 states have call predecessors, (38), 18 states have return successors, (54), 23 states have call predecessors, (54), 30 states have call successors, (54) Word has length 1574 [2021-11-12 22:35:32,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:32,439 INFO L225 Difference]: With dead ends: 435 [2021-11-12 22:35:32,439 INFO L226 Difference]: Without dead ends: 231 [2021-11-12 22:35:32,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3202 GetRequests, 3134 SyntacticMatches, 10 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 831 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=852, Invalid=2688, Unknown=0, NotChecked=0, Total=3540 [2021-11-12 22:35:32,445 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 457 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 928 mSolverCounterSat, 405 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 496.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 1333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.04ms SdHoareTripleChecker+Time, 405 IncrementalHoareTripleChecker+Valid, 928 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 595.89ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:32,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [457 Valid, 301 Invalid, 1333 Unknown, 0 Unchecked, 6.04ms Time], IncrementalHoareTripleChecker [405 Valid, 928 Invalid, 0 Unknown, 0 Unchecked, 595.89ms Time] [2021-11-12 22:35:32,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-12 22:35:32,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 174. [2021-11-12 22:35:32,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 138 states have internal predecessors, (143), 23 states have call successors, (23), 17 states have call predecessors, (23), 10 states have return successors, (58), 18 states have call predecessors, (58), 22 states have call successors, (58) [2021-11-12 22:35:32,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 224 transitions. [2021-11-12 22:35:32,459 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 224 transitions. Word has length 1574 [2021-11-12 22:35:32,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:32,464 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 224 transitions. [2021-11-12 22:35:32,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 6.111111111111111) internal successors, (220), 36 states have internal predecessors, (220), 30 states have call successors, (38), 1 states have call predecessors, (38), 18 states have return successors, (54), 23 states have call predecessors, (54), 30 states have call successors, (54) [2021-11-12 22:35:32,465 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 224 transitions. [2021-11-12 22:35:32,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3224 [2021-11-12 22:35:32,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:32,542 INFO L514 BasicCegarLoop]: trace histogram [330, 327, 267, 165, 165, 165, 165, 164, 164, 164, 164, 164, 163, 163, 162, 162, 102, 63, 1, 1, 1, 1] [2021-11-12 22:35:32,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:32,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:32,756 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:35:32,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:32,757 INFO L85 PathProgramCache]: Analyzing trace with hash 2062364074, now seen corresponding path program 15 times [2021-11-12 22:35:32,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:35:32,757 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668013892] [2021-11-12 22:35:32,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:32,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:35:33,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:34,870 INFO L134 CoverageAnalysis]: Checked inductivity of 384184 backedges. 8762 proven. 34041 refuted. 0 times theorem prover too weak. 341381 trivial. 0 not checked. [2021-11-12 22:35:34,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:35:34,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668013892] [2021-11-12 22:35:34,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668013892] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:35:34,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [787789079] [2021-11-12 22:35:34,871 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:35:34,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:34,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:35:34,872 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:35:34,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-12 22:35:35,773 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:35:35,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:35:35,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 3992 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-12 22:35:35,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:40,261 INFO L134 CoverageAnalysis]: Checked inductivity of 384184 backedges. 180804 proven. 21018 refuted. 0 times theorem prover too weak. 182362 trivial. 0 not checked. [2021-11-12 22:35:40,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:51,010 INFO L134 CoverageAnalysis]: Checked inductivity of 384184 backedges. 10436 proven. 37881 refuted. 0 times theorem prover too weak. 335867 trivial. 0 not checked. [2021-11-12 22:35:51,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [787789079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:51,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52862298] [2021-11-12 22:35:51,015 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:35:51,015 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:35:51,015 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) [2021-11-12 22:35:51,016 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:35:51,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 38] total 43 [2021-11-12 22:35:51,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360254923] [2021-11-12 22:35:51,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:35:51,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-12 22:35:51,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:35:51,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-12 22:35:51,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=1530, Unknown=0, NotChecked=0, Total=1806 [2021-11-12 22:35:51,024 INFO L87 Difference]: Start difference. First operand 174 states and 224 transitions. Second operand has 43 states, 43 states have (on average 6.0) internal successors, (258), 43 states have internal predecessors, (258), 38 states have call successors, (45), 3 states have call predecessors, (45), 19 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) [2021-11-12 22:35:52,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:52,439 INFO L93 Difference]: Finished difference Result 428 states and 598 transitions. [2021-11-12 22:35:52,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-12 22:35:52,440 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 6.0) internal successors, (258), 43 states have internal predecessors, (258), 38 states have call successors, (45), 3 states have call predecessors, (45), 19 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) Word has length 3223 [2021-11-12 22:35:52,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:52,448 INFO L225 Difference]: With dead ends: 428 [2021-11-12 22:35:52,449 INFO L226 Difference]: Without dead ends: 259 [2021-11-12 22:35:52,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6532 GetRequests, 6440 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1956 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1935, Invalid=6437, Unknown=0, NotChecked=0, Total=8372 [2021-11-12 22:35:52,453 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 1230 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 847 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 512.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1230 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 1606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.79ms SdHoareTripleChecker+Time, 847 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 629.49ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:52,454 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1230 Valid, 244 Invalid, 1606 Unknown, 0 Unchecked, 5.79ms Time], IncrementalHoareTripleChecker [847 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 629.49ms Time] [2021-11-12 22:35:52,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-12 22:35:52,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 187. [2021-11-12 22:35:52,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 150 states have (on average 1.02) internal successors, (153), 149 states have internal predecessors, (153), 25 states have call successors, (25), 18 states have call predecessors, (25), 11 states have return successors, (68), 19 states have call predecessors, (68), 24 states have call successors, (68) [2021-11-12 22:35:52,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 246 transitions. [2021-11-12 22:35:52,468 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 246 transitions. Word has length 3223 [2021-11-12 22:35:52,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:52,470 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 246 transitions. [2021-11-12 22:35:52,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 6.0) internal successors, (258), 43 states have internal predecessors, (258), 38 states have call successors, (45), 3 states have call predecessors, (45), 19 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) [2021-11-12 22:35:52,470 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 246 transitions. [2021-11-12 22:35:52,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1738 [2021-11-12 22:35:52,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:52,496 INFO L514 BasicCegarLoop]: trace histogram [178, 176, 144, 89, 89, 89, 89, 88, 88, 88, 88, 88, 88, 88, 87, 87, 55, 34, 1, 1, 1, 1] [2021-11-12 22:35:52,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:52,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:52,720 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:35:52,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:52,720 INFO L85 PathProgramCache]: Analyzing trace with hash -956644368, now seen corresponding path program 16 times [2021-11-12 22:35:52,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:35:52,720 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379102348] [2021-11-12 22:35:52,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:52,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:35:53,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:54,638 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18642 proven. 26756 refuted. 0 times theorem prover too weak. 65661 trivial. 0 not checked. [2021-11-12 22:35:54,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:35:54,638 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379102348] [2021-11-12 22:35:54,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379102348] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:35:54,639 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706986922] [2021-11-12 22:35:54,639 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:35:54,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:54,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:35:54,640 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:35:54,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-12 22:35:55,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:55,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 3240 conjuncts, 353 conjunts are in the unsatisfiable core [2021-11-12 22:35:55,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:59,256 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18335 proven. 20467 refuted. 0 times theorem prover too weak. 72257 trivial. 0 not checked. [2021-11-12 22:35:59,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:02,859 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 20425 proven. 19582 refuted. 0 times theorem prover too weak. 71052 trivial. 0 not checked. [2021-11-12 22:37:02,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706986922] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:02,859 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1003930915] [2021-11-12 22:37:02,862 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:37:02,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:37:02,862 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) [2021-11-12 22:37:02,863 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:37:02,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27, 47] total 66 [2021-11-12 22:37:02,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071738646] [2021-11-12 22:37:02,865 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:37:02,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-12 22:37:02,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:37:02,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-12 22:37:02,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=3470, Unknown=0, NotChecked=0, Total=4422 [2021-11-12 22:37:02,871 INFO L87 Difference]: Start difference. First operand 187 states and 246 transitions. Second operand has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) [2021-11-12 22:37:03,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:37:03,196 INFO L93 Difference]: Finished difference Result 218 states and 304 transitions. [2021-11-12 22:37:03,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-12 22:37:03,196 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) Word has length 1737 [2021-11-12 22:37:03,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:37:03,212 INFO L225 Difference]: With dead ends: 218 [2021-11-12 22:37:03,212 INFO L226 Difference]: Without dead ends: 217 [2021-11-12 22:37:03,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3829 GetRequests, 3760 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2205 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1063, Invalid=3907, Unknown=0, NotChecked=0, Total=4970 [2021-11-12 22:37:03,214 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 118 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 178.56ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.00ms SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 215.60ms IncrementalHoareTripleChecker+Time [2021-11-12 22:37:03,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 343 Invalid, 352 Unknown, 0 Unchecked, 5.00ms Time], IncrementalHoareTripleChecker [60 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 215.60ms Time] [2021-11-12 22:37:03,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-12 22:37:03,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 207. [2021-11-12 22:37:03,237 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) [2021-11-12 22:37:03,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 290 transitions. [2021-11-12 22:37:03,240 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 290 transitions. Word has length 1737 [2021-11-12 22:37:03,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:37:03,241 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 290 transitions. [2021-11-12 22:37:03,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) [2021-11-12 22:37:03,242 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 290 transitions. [2021-11-12 22:37:03,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5255 [2021-11-12 22:37:03,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:37:03,391 INFO L514 BasicCegarLoop]: trace histogram [539, 531, 437, 272, 272, 272, 272, 266, 266, 266, 266, 266, 265, 265, 264, 264, 165, 102, 1, 1, 1, 1] [2021-11-12 22:37:03,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:03,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-12 22:37:03,592 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:37:03,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:37:03,594 INFO L85 PathProgramCache]: Analyzing trace with hash 68269032, now seen corresponding path program 17 times [2021-11-12 22:37:03,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:37:03,594 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799764067] [2021-11-12 22:37:03,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:03,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:37:04,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:07,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1022902 backedges. 12769 proven. 55983 refuted. 0 times theorem prover too weak. 954150 trivial. 0 not checked. [2021-11-12 22:37:07,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:37:07,712 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799764067] [2021-11-12 22:37:07,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799764067] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:37:07,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480829814] [2021-11-12 22:37:07,714 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:37:07,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:37:07,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:37:07,723 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:37:07,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-12 22:37:12,815 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 280 check-sat command(s) [2021-11-12 22:37:12,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:12,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 6867 conjuncts, 709 conjunts are in the unsatisfiable core [2021-11-12 22:37:12,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:22,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1022902 backedges. 311231 proven. 81757 refuted. 0 times theorem prover too weak. 629914 trivial. 0 not checked. [2021-11-12 22:37:22,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:40:58,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1022902 backedges. 315842 proven. 79651 refuted. 0 times theorem prover too weak. 627409 trivial. 0 not checked. [2021-11-12 22:40:58,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [480829814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:40:58,894 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [528342601] [2021-11-12 22:40:58,897 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:40:58,897 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:40:58,897 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) [2021-11-12 22:40:58,909 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:40:58,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 30, 56] total 92 [2021-11-12 22:40:58,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469412420] [2021-11-12 22:40:58,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:40:58,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-12 22:40:58,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:40:58,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-12 22:40:58,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=7289, Unknown=0, NotChecked=0, Total=8372 [2021-11-12 22:40:58,925 INFO L87 Difference]: Start difference. First operand 207 states and 290 transitions. Second operand has 92 states, 92 states have (on average 3.358695652173913) internal successors, (309), 92 states have internal predecessors, (309), 39 states have call successors, (43), 7 states have call predecessors, (43), 32 states have return successors, (74), 63 states have call predecessors, (74), 33 states have call successors, (74) [2021-11-12 22:41:02,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:41:02,317 INFO L93 Difference]: Finished difference Result 548 states and 887 transitions. [2021-11-12 22:41:02,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-12 22:41:02,317 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 3.358695652173913) internal successors, (309), 92 states have internal predecessors, (309), 39 states have call successors, (43), 7 states have call predecessors, (43), 32 states have return successors, (74), 63 states have call predecessors, (74), 33 states have call successors, (74) Word has length 5254 [2021-11-12 22:41:02,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:41:02,324 INFO L225 Difference]: With dead ends: 548 [2021-11-12 22:41:02,324 INFO L226 Difference]: Without dead ends: 346 [2021-11-12 22:41:02,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10642 GetRequests, 10462 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11636 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4553, Invalid=28389, Unknown=0, NotChecked=0, Total=32942 [2021-11-12 22:41:02,333 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 770 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 1335 mSolverCounterSat, 478 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 603.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 770 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 1813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.49ms SdHoareTripleChecker+Time, 478 IncrementalHoareTripleChecker+Valid, 1335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 773.46ms IncrementalHoareTripleChecker+Time [2021-11-12 22:41:02,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [770 Valid, 129 Invalid, 1813 Unknown, 0 Unchecked, 5.49ms Time], IncrementalHoareTripleChecker [478 Valid, 1335 Invalid, 0 Unknown, 0 Unchecked, 773.46ms Time] [2021-11-12 22:41:02,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-12 22:41:02,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 299. [2021-11-12 22:41:02,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 241 states have (on average 1.020746887966805) internal successors, (246), 237 states have internal predecessors, (246), 39 states have call successors, (39), 26 states have call predecessors, (39), 18 states have return successors, (168), 35 states have call predecessors, (168), 38 states have call successors, (168) [2021-11-12 22:41:02,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 453 transitions. [2021-11-12 22:41:02,357 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 453 transitions. Word has length 5254 [2021-11-12 22:41:02,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:41:02,359 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 453 transitions. [2021-11-12 22:41:02,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 3.358695652173913) internal successors, (309), 92 states have internal predecessors, (309), 39 states have call successors, (43), 7 states have call predecessors, (43), 32 states have return successors, (74), 63 states have call predecessors, (74), 33 states have call successors, (74) [2021-11-12 22:41:02,360 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 453 transitions. [2021-11-12 22:41:02,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5067 [2021-11-12 22:41:02,553 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:41:02,555 INFO L514 BasicCegarLoop]: trace histogram [517, 516, 418, 258, 258, 258, 258, 258, 258, 258, 258, 258, 258, 258, 257, 257, 160, 99, 1, 1, 1, 1] [2021-11-12 22:41:02,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-12 22:41:02,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-12 22:41:02,755 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:41:02,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:41:02,757 INFO L85 PathProgramCache]: Analyzing trace with hash -187774912, now seen corresponding path program 18 times [2021-11-12 22:41:02,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:41:02,758 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677618858] [2021-11-12 22:41:02,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:02,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:41:04,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:07,081 INFO L134 CoverageAnalysis]: Checked inductivity of 950938 backedges. 53231 proven. 12116 refuted. 0 times theorem prover too weak. 885591 trivial. 0 not checked. [2021-11-12 22:41:07,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:41:07,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677618858] [2021-11-12 22:41:07,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677618858] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:41:07,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401141312] [2021-11-12 22:41:07,081 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:41:07,081 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:07,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:41:07,082 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:41:07,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-12 22:41:10,685 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:41:10,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:41:10,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 6265 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-12 22:41:10,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:17,556 INFO L134 CoverageAnalysis]: Checked inductivity of 950938 backedges. 39085 proven. 53557 refuted. 0 times theorem prover too weak. 858296 trivial. 0 not checked. [2021-11-12 22:41:17,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:39,544 INFO L134 CoverageAnalysis]: Checked inductivity of 950938 backedges. 39069 proven. 54086 refuted. 0 times theorem prover too weak. 857783 trivial. 0 not checked. [2021-11-12 22:41:39,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401141312] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:39,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [223249170] [2021-11-12 22:41:39,547 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:41:39,547 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:41:39,547 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) [2021-11-12 22:41:39,547 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:41:39,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 27, 46] total 53 [2021-11-12 22:41:39,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270555923] [2021-11-12 22:41:39,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:41:39,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-12 22:41:39,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:41:39,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-12 22:41:39,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=2298, Unknown=0, NotChecked=0, Total=2756 [2021-11-12 22:41:39,557 INFO L87 Difference]: Start difference. First operand 299 states and 453 transitions. Second operand has 53 states, 53 states have (on average 5.622641509433962) internal successors, (298), 53 states have internal predecessors, (298), 46 states have call successors, (51), 1 states have call predecessors, (51), 23 states have return successors, (72), 27 states have call predecessors, (72), 46 states have call successors, (72) [2021-11-12 22:41:41,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:41:41,389 INFO L93 Difference]: Finished difference Result 749 states and 1532 transitions. [2021-11-12 22:41:41,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-12 22:41:41,396 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 5.622641509433962) internal successors, (298), 53 states have internal predecessors, (298), 46 states have call successors, (51), 1 states have call predecessors, (51), 23 states have return successors, (72), 27 states have call predecessors, (72), 46 states have call successors, (72) Word has length 5066 [2021-11-12 22:41:41,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:41:41,405 INFO L225 Difference]: With dead ends: 749 [2021-11-12 22:41:41,405 INFO L226 Difference]: Without dead ends: 455 [2021-11-12 22:41:41,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10199 GetRequests, 10115 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1849 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1674, Invalid=5298, Unknown=0, NotChecked=0, Total=6972 [2021-11-12 22:41:41,413 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 970 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 1501 mSolverCounterSat, 1519 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1025.46ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 970 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 3020 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.48ms SdHoareTripleChecker+Time, 1519 IncrementalHoareTripleChecker+Valid, 1501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1262.33ms IncrementalHoareTripleChecker+Time [2021-11-12 22:41:41,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [970 Valid, 442 Invalid, 3020 Unknown, 0 Unchecked, 8.48ms Time], IncrementalHoareTripleChecker [1519 Valid, 1501 Invalid, 0 Unknown, 0 Unchecked, 1262.33ms Time] [2021-11-12 22:41:41,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-12 22:41:41,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 259. [2021-11-12 22:41:41,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 208 states have (on average 1.0192307692307692) internal successors, (212), 207 states have internal predecessors, (212), 35 states have call successors, (35), 24 states have call predecessors, (35), 15 states have return successors, (134), 27 states have call predecessors, (134), 34 states have call successors, (134) [2021-11-12 22:41:41,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 381 transitions. [2021-11-12 22:41:41,451 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 381 transitions. Word has length 5066 [2021-11-12 22:41:41,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:41:41,454 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 381 transitions. [2021-11-12 22:41:41,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 5.622641509433962) internal successors, (298), 53 states have internal predecessors, (298), 46 states have call successors, (51), 1 states have call predecessors, (51), 23 states have return successors, (72), 27 states have call predecessors, (72), 46 states have call successors, (72) [2021-11-12 22:41:41,454 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 381 transitions. [2021-11-12 22:41:41,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5642 [2021-11-12 22:41:41,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:41:41,674 INFO L514 BasicCegarLoop]: trace histogram [576, 574, 466, 288, 288, 288, 288, 287, 287, 287, 287, 287, 287, 287, 286, 286, 178, 110, 1, 1, 1, 1] [2021-11-12 22:41:41,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-12 22:41:41,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:41,900 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:41:41,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:41:41,901 INFO L85 PathProgramCache]: Analyzing trace with hash 1218820887, now seen corresponding path program 19 times [2021-11-12 22:41:41,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:41:41,901 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561201623] [2021-11-12 22:41:41,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:41,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:41:43,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:45,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 29084 proven. 67761 refuted. 0 times theorem prover too weak. 1082587 trivial. 0 not checked. [2021-11-12 22:41:45,922 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:41:45,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561201623] [2021-11-12 22:41:45,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561201623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:41:45,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067484258] [2021-11-12 22:41:45,922 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:41:45,922 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:45,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:41:45,923 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:41:45,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-12 22:41:50,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:50,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 10451 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-12 22:41:50,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:57,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 32530 proven. 71094 refuted. 0 times theorem prover too weak. 1075808 trivial. 0 not checked. [2021-11-12 22:41:57,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:18,295 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 32530 proven. 71574 refuted. 0 times theorem prover too weak. 1075328 trivial. 0 not checked. [2021-11-12 22:42:18,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067484258] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:18,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1485619622] [2021-11-12 22:42:18,297 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 22:42:18,297 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:42:18,297 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) [2021-11-12 22:42:18,298 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:42:18,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 47] total 52 [2021-11-12 22:42:18,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532992273] [2021-11-12 22:42:18,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:42:18,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-12 22:42:18,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:42:18,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-12 22:42:18,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=2248, Unknown=0, NotChecked=0, Total=2652 [2021-11-12 22:42:18,305 INFO L87 Difference]: Start difference. First operand 259 states and 381 transitions. Second operand has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) [2021-11-12 22:42:19,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:42:19,838 INFO L93 Difference]: Finished difference Result 660 states and 1156 transitions. [2021-11-12 22:42:19,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-12 22:42:19,838 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) Word has length 5641 [2021-11-12 22:42:19,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:42:19,845 INFO L225 Difference]: With dead ends: 660 [2021-11-12 22:42:19,846 INFO L226 Difference]: Without dead ends: 406 [2021-11-12 22:42:19,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11377 GetRequests, 11274 SyntacticMatches, 2 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2433 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2404, Invalid=8102, Unknown=0, NotChecked=0, Total=10506 [2021-11-12 22:42:19,851 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 1438 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 1127 mSolverCounterSat, 1048 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 612.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1438 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 2175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.80ms SdHoareTripleChecker+Time, 1048 IncrementalHoareTripleChecker+Valid, 1127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 751.34ms IncrementalHoareTripleChecker+Time [2021-11-12 22:42:19,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1438 Valid, 333 Invalid, 2175 Unknown, 0 Unchecked, 4.80ms Time], IncrementalHoareTripleChecker [1048 Valid, 1127 Invalid, 0 Unknown, 0 Unchecked, 751.34ms Time] [2021-11-12 22:42:19,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-11-12 22:42:19,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 265. [2021-11-12 22:42:19,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 213 states have (on average 1.0187793427230047) internal successors, (217), 212 states have internal predecessors, (217), 36 states have call successors, (36), 25 states have call predecessors, (36), 15 states have return successors, (131), 27 states have call predecessors, (131), 35 states have call successors, (131) [2021-11-12 22:42:19,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 384 transitions. [2021-11-12 22:42:19,877 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 384 transitions. Word has length 5641 [2021-11-12 22:42:19,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:42:19,880 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 384 transitions. [2021-11-12 22:42:19,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 5.615384615384615) internal successors, (292), 52 states have internal predecessors, (292), 45 states have call successors, (49), 1 states have call predecessors, (49), 23 states have return successors, (68), 25 states have call predecessors, (68), 45 states have call successors, (68) [2021-11-12 22:42:19,881 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 384 transitions. [2021-11-12 22:42:20,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13712 [2021-11-12 22:42:20,928 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:42:20,932 INFO L514 BasicCegarLoop]: trace histogram [1400, 1395, 1133, 701, 701, 701, 701, 698, 698, 698, 698, 698, 697, 697, 696, 696, 432, 267, 1, 1, 1, 1] [2021-11-12 22:42:20,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-12 22:42:21,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-12 22:42:21,133 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-12 22:42:21,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:42:21,137 INFO L85 PathProgramCache]: Analyzing trace with hash 1490952314, now seen corresponding path program 20 times [2021-11-12 22:42:21,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:42:21,137 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555557502] [2021-11-12 22:42:21,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:42:21,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:42:26,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:42:38,927 INFO L134 CoverageAnalysis]: Checked inductivity of 6980542 backedges. 48449 proven. 200156 refuted. 0 times theorem prover too weak. 6731937 trivial. 0 not checked. [2021-11-12 22:42:38,928 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:42:38,928 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555557502] [2021-11-12 22:42:38,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555557502] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:42:38,928 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700785778] [2021-11-12 22:42:38,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:42:38,928 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:42:38,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:42:38,929 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:42:38,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83fd5703-30e4-4866-b274-77de286c4e6d/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-12 22:43:08,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 707 check-sat command(s) [2021-11-12 22:43:08,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:08,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 18104 conjuncts, 1861 conjunts are in the unsatisfiable core [2021-11-12 22:43:08,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:33,533 INFO L134 CoverageAnalysis]: Checked inductivity of 6980542 backedges. 2160220 proven. 556524 refuted. 0 times theorem prover too weak. 4263798 trivial. 0 not checked. [2021-11-12 22:43:33,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:44:46,526 WARN L227 SmtUtils]: Spent 12.00s 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)