./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7 --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 64bit --witnessprinter.graph.data.programhash 14cfbc3a2ba2bfe3a03d4d1ebff24b0baf1851f06dbbd2468b59e09322e4ce16 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:28:55,450 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:28:55,453 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:28:55,514 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:28:55,515 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:28:55,520 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:28:55,523 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:28:55,528 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:28:55,531 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:28:55,538 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:28:55,539 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:28:55,541 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:28:55,542 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:28:55,545 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:28:55,547 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:28:55,552 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:28:55,554 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:28:55,555 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:28:55,558 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:28:55,566 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:28:55,568 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:28:55,570 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:28:55,574 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:28:55,575 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:28:55,585 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:28:55,586 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:28:55,586 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:28:55,588 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:28:55,589 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:28:55,590 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:28:55,591 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:28:55,592 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:28:55,594 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:28:55,595 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:28:55,598 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:28:55,599 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:28:55,599 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:28:55,600 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:28:55,600 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:28:55,601 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:28:55,602 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:28:55,603 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/config/svcomp-Overflow-64bit-Taipan_Default.epf [2021-11-25 20:28:55,639 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:28:55,644 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:28:55,645 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:28:55,645 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:28:55,646 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:28:55,653 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:28:55,653 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:28:55,653 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:28:55,653 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:28:55,654 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:28:55,655 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:28:55,655 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:28:55,655 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:28:55,655 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:28:55,656 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:28:55,656 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:28:55,656 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:28:55,656 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:28:55,657 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:28:55,657 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 20:28:55,657 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:28:55,658 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:28:55,658 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:28:55,658 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:28:55,658 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:28:55,658 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-25 20:28:55,660 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:28:55,660 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:28:55,661 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:28:55,661 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:28:55,661 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:28:55,661 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:28:55,662 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:28:55,662 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:28:55,662 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:28:55,662 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:28:55,663 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:28:55,663 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:28:55,663 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:28:55,663 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:28:55,663 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_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 14cfbc3a2ba2bfe3a03d4d1ebff24b0baf1851f06dbbd2468b59e09322e4ce16 [2021-11-25 20:28:56,029 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:28:56,065 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:28:56,069 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:28:56,070 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:28:56,071 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:28:56,073 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/termination-numeric/Fibonacci01-2.c [2021-11-25 20:28:56,144 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/data/6fe6b84f2/b8d96fc49a584d6f9213cbc0b20e2475/FLAG89505e2fd [2021-11-25 20:28:56,679 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:28:56,679 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c [2021-11-25 20:28:56,692 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/data/6fe6b84f2/b8d96fc49a584d6f9213cbc0b20e2475/FLAG89505e2fd [2021-11-25 20:28:57,038 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/data/6fe6b84f2/b8d96fc49a584d6f9213cbc0b20e2475 [2021-11-25 20:28:57,042 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:28:57,045 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:28:57,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:28:57,051 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:28:57,055 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:28:57,055 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,058 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@160d3080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57, skipping insertion in model container [2021-11-25 20:28:57,059 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,066 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:28:57,082 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:28:57,343 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c[761,774] [2021-11-25 20:28:57,344 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:28:57,356 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:28:57,377 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/sv-benchmarks/c/termination-numeric/Fibonacci01-2.c[761,774] [2021-11-25 20:28:57,378 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:28:57,392 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:28:57,392 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57 WrapperNode [2021-11-25 20:28:57,392 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:28:57,393 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:28:57,393 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:28:57,394 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:28:57,408 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,415 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,435 INFO L137 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 26 [2021-11-25 20:28:57,436 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:28:57,438 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:28:57,438 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:28:57,439 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:28:57,447 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,448 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,462 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,463 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,465 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,467 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,469 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,470 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:28:57,471 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:28:57,471 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:28:57,472 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:28:57,473 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (1/1) ... [2021-11-25 20:28:57,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:28:57,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:57,504 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:28:57,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:28:57,545 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-25 20:28:57,545 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-25 20:28:57,545 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:28:57,545 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:28:57,545 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:28:57,546 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:28:57,604 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:28:57,606 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:28:57,738 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:28:57,758 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:28:57,758 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 20:28:57,760 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:28:57 BoogieIcfgContainer [2021-11-25 20:28:57,760 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:28:57,762 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:28:57,762 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:28:57,783 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:28:57,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:28:57" (1/3) ... [2021-11-25 20:28:57,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51694b35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:28:57, skipping insertion in model container [2021-11-25 20:28:57,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:28:57" (2/3) ... [2021-11-25 20:28:57,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51694b35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:28:57, skipping insertion in model container [2021-11-25 20:28:57,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:28:57" (3/3) ... [2021-11-25 20:28:57,786 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci01-2.c [2021-11-25 20:28:57,791 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:28:57,791 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-25 20:28:57,838 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:28:57,846 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 [2021-11-25 20:28:57,846 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-25 20:28:57,862 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) [2021-11-25 20:28:57,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 20:28:57,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:57,867 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:57,867 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:28:57,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:57,873 INFO L85 PathProgramCache]: Analyzing trace with hash 1639303625, now seen corresponding path program 1 times [2021-11-25 20:28:57,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:57,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232621661] [2021-11-25 20:28:57,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:57,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:58,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:58,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:28:58,078 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:58,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232621661] [2021-11-25 20:28:58,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232621661] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:28:58,079 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:28:58,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:28:58,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152324242] [2021-11-25 20:28:58,082 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:28:58,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:28:58,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:58,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:28:58,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:28:58,117 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, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:58,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:58,211 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-11-25 20:28:58,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:28:58,214 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 20:28:58,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:58,222 INFO L225 Difference]: With dead ends: 27 [2021-11-25 20:28:58,222 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 20:28:58,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:28:58,230 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 36 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:58,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 19 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:28:58,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 20:28:58,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-25 20:28:58,267 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) [2021-11-25 20:28:58,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-25 20:28:58,270 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 7 [2021-11-25 20:28:58,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:58,271 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-25 20:28:58,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:28:58,271 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-25 20:28:58,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:28:58,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:58,273 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:58,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:28:58,274 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:28:58,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:58,275 INFO L85 PathProgramCache]: Analyzing trace with hash -721195135, now seen corresponding path program 1 times [2021-11-25 20:28:58,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:58,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308088046] [2021-11-25 20:28:58,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:58,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:58,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:58,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:28:58,306 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:58,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308088046] [2021-11-25 20:28:58,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308088046] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:28:58,307 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:28:58,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:28:58,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990374155] [2021-11-25 20:28:58,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:28:58,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:28:58,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:58,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:28:58,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:28:58,311 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) [2021-11-25 20:28:58,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:58,330 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-11-25 20:28:58,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:28:58,331 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 [2021-11-25 20:28:58,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:58,334 INFO L225 Difference]: With dead ends: 24 [2021-11-25 20:28:58,334 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 20:28:58,334 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 [2021-11-25 20:28:58,336 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:58,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 24 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:28:58,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 20:28:58,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2021-11-25 20:28:58,344 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) [2021-11-25 20:28:58,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-25 20:28:58,346 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 8 [2021-11-25 20:28:58,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:58,346 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-25 20:28:58,346 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) [2021-11-25 20:28:58,347 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-25 20:28:58,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:28:58,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:58,348 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:28:58,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:28:58,349 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:28:58,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:58,350 INFO L85 PathProgramCache]: Analyzing trace with hash -793689855, now seen corresponding path program 1 times [2021-11-25 20:28:58,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:58,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088501651] [2021-11-25 20:28:58,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:58,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:58,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:58,477 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:28:58,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:58,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088501651] [2021-11-25 20:28:58,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088501651] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:28:58,480 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:28:58,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:28:58,480 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261997584] [2021-11-25 20:28:58,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:28:58,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:28:58,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:58,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:28:58,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:28:58,486 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) [2021-11-25 20:28:58,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:58,567 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-25 20:28:58,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:28:58,568 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-25 20:28:58,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:58,569 INFO L225 Difference]: With dead ends: 36 [2021-11-25 20:28:58,569 INFO L226 Difference]: Without dead ends: 34 [2021-11-25 20:28:58,570 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 [2021-11-25 20:28:58,577 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:58,578 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 63 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:28:58,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-25 20:28:58,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2021-11-25 20:28:58,604 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) [2021-11-25 20:28:58,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-25 20:28:58,606 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 23 [2021-11-25 20:28:58,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:58,607 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-25 20:28:58,607 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) [2021-11-25 20:28:58,607 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-25 20:28:58,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 20:28:58,609 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:58,609 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] [2021-11-25 20:28:58,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:28:58,610 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:28:58,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:58,610 INFO L85 PathProgramCache]: Analyzing trace with hash 1176736919, now seen corresponding path program 1 times [2021-11-25 20:28:58,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:58,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839932821] [2021-11-25 20:28:58,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:58,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:58,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:58,713 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:28:58,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:58,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839932821] [2021-11-25 20:28:58,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839932821] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:58,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434906016] [2021-11-25 20:28:58,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:58,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:58,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:58,721 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:28:58,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:28:58,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:58,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:28:58,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:28:58,990 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:28:58,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:28:59,246 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:28:59,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434906016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:28:59,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1022939417] [2021-11-25 20:28:59,278 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:28:59,278 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:28:59,283 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) [2021-11-25 20:28:59,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:28:59,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2021-11-25 20:28:59,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411223441] [2021-11-25 20:28:59,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:28:59,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 20:28:59,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:28:59,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 20:28:59,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:28:59,304 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) [2021-11-25 20:28:59,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:28:59,679 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2021-11-25 20:28:59,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:28:59,680 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 24 [2021-11-25 20:28:59,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:28:59,682 INFO L225 Difference]: With dead ends: 90 [2021-11-25 20:28:59,682 INFO L226 Difference]: Without dead ends: 64 [2021-11-25 20:28:59,684 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:28:59,686 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 121 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:28:59,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 67 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:28:59,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-25 20:28:59,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2021-11-25 20:28:59,699 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) [2021-11-25 20:28:59,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-25 20:28:59,702 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 24 [2021-11-25 20:28:59,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:28:59,703 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-25 20:28:59,703 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) [2021-11-25 20:28:59,703 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-25 20:28:59,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 20:28:59,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:28:59,705 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] [2021-11-25 20:28:59,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:28:59,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:59,912 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:28:59,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:28:59,913 INFO L85 PathProgramCache]: Analyzing trace with hash 1108024065, now seen corresponding path program 2 times [2021-11-25 20:28:59,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:28:59,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202938962] [2021-11-25 20:28:59,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:28:59,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:28:59,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:28:59,976 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:28:59,977 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:28:59,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202938962] [2021-11-25 20:28:59,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202938962] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:28:59,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829345270] [2021-11-25 20:28:59,978 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:28:59,978 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:28:59,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:28:59,979 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:00,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:29:00,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:29:00,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:00,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:29:00,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:00,160 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:29:00,160 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:29:00,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829345270] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:00,161 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:29:00,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2021-11-25 20:29:00,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033153062] [2021-11-25 20:29:00,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:00,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:29:00,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:00,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:29:00,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:29:00,163 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 20:29:00,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:00,204 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-11-25 20:29:00,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:29:00,206 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-11-25 20:29:00,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:00,209 INFO L225 Difference]: With dead ends: 60 [2021-11-25 20:29:00,209 INFO L226 Difference]: Without dead ends: 59 [2021-11-25 20:29:00,209 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:29:00,210 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 9 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:00,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 45 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:29:00,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-25 20:29:00,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-11-25 20:29:00,227 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) [2021-11-25 20:29:00,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-11-25 20:29:00,233 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 30 [2021-11-25 20:29:00,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:00,233 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-11-25 20:29:00,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 20:29:00,234 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-11-25 20:29:00,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 20:29:00,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:00,235 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] [2021-11-25 20:29:00,257 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-25 20:29:00,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:00,454 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:00,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:00,455 INFO L85 PathProgramCache]: Analyzing trace with hash -1566519763, now seen corresponding path program 1 times [2021-11-25 20:29:00,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:00,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215063203] [2021-11-25 20:29:00,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:00,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:00,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:00,515 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:29:00,515 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:00,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215063203] [2021-11-25 20:29:00,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215063203] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:00,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496173146] [2021-11-25 20:29:00,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:00,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:00,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:00,522 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:00,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:29:00,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:00,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:29:00,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:00,690 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:29:00,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:00,794 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:29:00,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496173146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:00,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1000252809] [2021-11-25 20:29:00,799 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:00,800 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:00,800 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) [2021-11-25 20:29:00,801 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:00,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2021-11-25 20:29:00,802 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101494076] [2021-11-25 20:29:00,802 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:00,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 20:29:00,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:00,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 20:29:00,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:29:00,804 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) [2021-11-25 20:29:00,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:00,926 INFO L93 Difference]: Finished difference Result 69 states and 93 transitions. [2021-11-25 20:29:00,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:29:00,927 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 [2021-11-25 20:29:00,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:00,933 INFO L225 Difference]: With dead ends: 69 [2021-11-25 20:29:00,933 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 20:29:00,935 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 [2021-11-25 20:29:00,936 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 9 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:00,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 210 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:00,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 20:29:00,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-11-25 20:29:00,965 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) [2021-11-25 20:29:00,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2021-11-25 20:29:00,972 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 25 [2021-11-25 20:29:00,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:00,973 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2021-11-25 20:29:00,973 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) [2021-11-25 20:29:00,974 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2021-11-25 20:29:00,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:29:00,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:00,979 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] [2021-11-25 20:29:01,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:01,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:01,196 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:01,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:01,196 INFO L85 PathProgramCache]: Analyzing trace with hash 824601704, now seen corresponding path program 1 times [2021-11-25 20:29:01,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:01,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300972881] [2021-11-25 20:29:01,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:01,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:01,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:01,334 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 20:29:01,335 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:01,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300972881] [2021-11-25 20:29:01,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300972881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:01,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990623308] [2021-11-25 20:29:01,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:01,336 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:01,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:01,340 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:01,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:29:01,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:01,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 20:29:01,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:01,556 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-25 20:29:01,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:01,785 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 20:29:01,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990623308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:01,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226733949] [2021-11-25 20:29:01,788 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:01,789 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:01,789 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) [2021-11-25 20:29:01,789 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:01,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2021-11-25 20:29:01,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999203847] [2021-11-25 20:29:01,790 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:01,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:29:01,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:01,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:29:01,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:29:01,791 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) [2021-11-25 20:29:02,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:02,008 INFO L93 Difference]: Finished difference Result 134 states and 199 transitions. [2021-11-25 20:29:02,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:29:02,009 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 [2021-11-25 20:29:02,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:02,012 INFO L225 Difference]: With dead ends: 134 [2021-11-25 20:29:02,012 INFO L226 Difference]: Without dead ends: 133 [2021-11-25 20:29:02,013 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 [2021-11-25 20:29:02,014 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 45 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:02,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 191 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:02,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-25 20:29:02,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 98. [2021-11-25 20:29:02,031 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) [2021-11-25 20:29:02,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-25 20:29:02,035 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 50 [2021-11-25 20:29:02,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:02,035 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-25 20:29:02,035 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) [2021-11-25 20:29:02,036 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-25 20:29:02,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 20:29:02,039 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:02,039 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2021-11-25 20:29:02,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:02,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:29:02,260 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:02,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:02,260 INFO L85 PathProgramCache]: Analyzing trace with hash -253469865, now seen corresponding path program 1 times [2021-11-25 20:29:02,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:02,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515121746] [2021-11-25 20:29:02,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:02,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:02,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:02,358 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-11-25 20:29:02,358 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:02,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515121746] [2021-11-25 20:29:02,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515121746] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:02,358 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:02,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:29:02,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429502478] [2021-11-25 20:29:02,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:02,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:29:02,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:02,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:29:02,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:29:02,360 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 20:29:02,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:02,398 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-25 20:29:02,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:29:02,399 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 69 [2021-11-25 20:29:02,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:02,401 INFO L225 Difference]: With dead ends: 111 [2021-11-25 20:29:02,401 INFO L226 Difference]: Without dead ends: 110 [2021-11-25 20:29:02,402 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 [2021-11-25 20:29:02,402 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:02,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 69 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:29:02,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-25 20:29:02,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-25 20:29:02,417 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) [2021-11-25 20:29:02,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-25 20:29:02,421 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 69 [2021-11-25 20:29:02,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:02,421 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-25 20:29:02,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 20:29:02,422 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-25 20:29:02,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 20:29:02,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:02,425 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] [2021-11-25 20:29:02,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 20:29:02,425 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:02,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:02,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1250907059, now seen corresponding path program 2 times [2021-11-25 20:29:02,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:02,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000881125] [2021-11-25 20:29:02,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:02,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:02,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:02,483 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-11-25 20:29:02,483 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:02,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000881125] [2021-11-25 20:29:02,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000881125] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:02,484 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:02,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:29:02,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129833131] [2021-11-25 20:29:02,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:02,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:29:02,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:02,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:29:02,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:29:02,485 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) [2021-11-25 20:29:02,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:02,512 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-25 20:29:02,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:29:02,513 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 [2021-11-25 20:29:02,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:02,515 INFO L225 Difference]: With dead ends: 111 [2021-11-25 20:29:02,515 INFO L226 Difference]: Without dead ends: 110 [2021-11-25 20:29:02,516 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 [2021-11-25 20:29:02,516 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:02,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 45 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:29:02,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-25 20:29:02,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-25 20:29:02,528 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) [2021-11-25 20:29:02,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-25 20:29:02,531 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 70 [2021-11-25 20:29:02,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:02,532 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-25 20:29:02,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 20:29:02,532 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-25 20:29:02,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-25 20:29:02,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:02,535 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 11, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2021-11-25 20:29:02,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 20:29:02,535 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:02,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:02,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1849402008, now seen corresponding path program 2 times [2021-11-25 20:29:02,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:02,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27633225] [2021-11-25 20:29:02,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:02,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:02,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:02,741 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 68 proven. 165 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2021-11-25 20:29:02,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:02,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27633225] [2021-11-25 20:29:02,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27633225] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:02,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301040331] [2021-11-25 20:29:02,742 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:02,742 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:02,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:02,743 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:02,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:29:02,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 20:29:02,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:02,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:29:02,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:03,089 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 198 proven. 85 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-25 20:29:03,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:03,700 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 198 proven. 88 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-11-25 20:29:03,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301040331] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:03,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [750784204] [2021-11-25 20:29:03,705 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:03,705 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:03,706 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) [2021-11-25 20:29:03,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:03,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 19 [2021-11-25 20:29:03,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150285788] [2021-11-25 20:29:03,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:03,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:29:03,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:03,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:29:03,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:29:03,709 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) [2021-11-25 20:29:04,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:04,090 INFO L93 Difference]: Finished difference Result 175 states and 303 transitions. [2021-11-25 20:29:04,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 20:29:04,091 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) Word has length 128 [2021-11-25 20:29:04,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:04,092 INFO L225 Difference]: With dead ends: 175 [2021-11-25 20:29:04,092 INFO L226 Difference]: Without dead ends: 80 [2021-11-25 20:29:04,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=254, Invalid=676, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:29:04,095 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 260 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:04,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 78 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:29:04,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-25 20:29:04,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2021-11-25 20:29:04,101 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) [2021-11-25 20:29:04,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2021-11-25 20:29:04,103 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 128 [2021-11-25 20:29:04,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:04,103 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2021-11-25 20:29:04,104 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) [2021-11-25 20:29:04,104 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2021-11-25 20:29:04,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 20:29:04,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:04,105 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 8, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-25 20:29:04,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:04,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:29:04,324 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:04,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:04,325 INFO L85 PathProgramCache]: Analyzing trace with hash 1605134966, now seen corresponding path program 3 times [2021-11-25 20:29:04,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:04,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739600783] [2021-11-25 20:29:04,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:04,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:04,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:04,441 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 93 proven. 48 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-25 20:29:04,441 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:04,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739600783] [2021-11-25 20:29:04,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1739600783] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:04,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699454382] [2021-11-25 20:29:04,442 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:04,442 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:04,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:04,443 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:04,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:29:04,489 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:04,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:04,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:29:04,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:04,684 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 140 proven. 37 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:29:04,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:05,254 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 102 proven. 62 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-11-25 20:29:05,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699454382] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:05,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283458349] [2021-11-25 20:29:05,257 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:05,257 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:05,257 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) [2021-11-25 20:29:05,258 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:05,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2021-11-25 20:29:05,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530411907] [2021-11-25 20:29:05,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:05,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:29:05,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:05,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:29:05,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:29:05,261 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) [2021-11-25 20:29:05,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:05,462 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2021-11-25 20:29:05,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:29:05,463 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) Word has length 90 [2021-11-25 20:29:05,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:05,464 INFO L225 Difference]: With dead ends: 131 [2021-11-25 20:29:05,464 INFO L226 Difference]: Without dead ends: 64 [2021-11-25 20:29:05,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 174 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:29:05,465 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 105 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:05,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 70 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:05,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-25 20:29:05,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-25 20:29:05,471 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) [2021-11-25 20:29:05,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-25 20:29:05,472 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 90 [2021-11-25 20:29:05,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:05,473 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-25 20:29:05,473 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) [2021-11-25 20:29:05,474 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-25 20:29:05,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 20:29:05,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:05,475 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 8, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2021-11-25 20:29:05,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:05,700 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:05,700 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:05,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:05,700 INFO L85 PathProgramCache]: Analyzing trace with hash -935145530, now seen corresponding path program 3 times [2021-11-25 20:29:05,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:05,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735899780] [2021-11-25 20:29:05,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:05,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:05,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:05,831 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 20:29:05,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:05,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735899780] [2021-11-25 20:29:05,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735899780] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:05,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753235597] [2021-11-25 20:29:05,833 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:05,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:05,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:05,834 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:05,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:29:05,890 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:05,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:05,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:29:05,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:06,082 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2021-11-25 20:29:06,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:06,355 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2021-11-25 20:29:06,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753235597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:06,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1246028481] [2021-11-25 20:29:06,358 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:06,358 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:06,359 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) [2021-11-25 20:29:06,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:06,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 18 [2021-11-25 20:29:06,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107492765] [2021-11-25 20:29:06,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:06,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:29:06,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:06,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:29:06,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:29:06,362 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) [2021-11-25 20:29:06,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:06,478 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-11-25 20:29:06,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:29:06,479 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 90 [2021-11-25 20:29:06,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:06,480 INFO L225 Difference]: With dead ends: 68 [2021-11-25 20:29:06,480 INFO L226 Difference]: Without dead ends: 67 [2021-11-25 20:29:06,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:29:06,481 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 27 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:06,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 147 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:06,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-25 20:29:06,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2021-11-25 20:29:06,486 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) [2021-11-25 20:29:06,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-11-25 20:29:06,487 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 90 [2021-11-25 20:29:06,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:06,488 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-11-25 20:29:06,488 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) [2021-11-25 20:29:06,488 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-11-25 20:29:06,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-11-25 20:29:06,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:06,490 INFO L514 BasicCegarLoop]: trace histogram [23, 21, 18, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 9, 7, 5, 1, 1, 1, 1] [2021-11-25 20:29:06,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:06,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:06,716 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:06,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:06,717 INFO L85 PathProgramCache]: Analyzing trace with hash -318328441, now seen corresponding path program 4 times [2021-11-25 20:29:06,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:06,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758833429] [2021-11-25 20:29:06,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:06,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:06,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:06,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1590 backedges. 219 proven. 562 refuted. 0 times theorem prover too weak. 809 trivial. 0 not checked. [2021-11-25 20:29:06,947 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:06,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758833429] [2021-11-25 20:29:06,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758833429] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:06,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26320166] [2021-11-25 20:29:06,948 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:06,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:06,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:06,949 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:06,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:29:07,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:07,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:29:07,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:07,537 INFO L134 CoverageAnalysis]: Checked inductivity of 1590 backedges. 619 proven. 533 refuted. 0 times theorem prover too weak. 438 trivial. 0 not checked. [2021-11-25 20:29:07,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:08,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1590 backedges. 271 proven. 717 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2021-11-25 20:29:08,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26320166] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:08,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1942489460] [2021-11-25 20:29:08,664 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:08,664 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:08,665 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) [2021-11-25 20:29:08,666 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:08,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 18] total 23 [2021-11-25 20:29:08,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941182527] [2021-11-25 20:29:08,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:08,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:29:08,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:08,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:29:08,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:29:08,670 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 23 states, 23 states have (on average 6.0) internal successors, (138), 23 states have internal predecessors, (138), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) [2021-11-25 20:29:09,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:09,130 INFO L93 Difference]: Finished difference Result 152 states and 184 transitions. [2021-11-25 20:29:09,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 20:29:09,130 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 6.0) internal successors, (138), 23 states have internal predecessors, (138), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) Word has length 215 [2021-11-25 20:29:09,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:09,132 INFO L225 Difference]: With dead ends: 152 [2021-11-25 20:29:09,132 INFO L226 Difference]: Without dead ends: 94 [2021-11-25 20:29:09,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 425 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=411, Invalid=1071, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:29:09,134 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 210 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:09,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 87 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:29:09,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-25 20:29:09,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 81. [2021-11-25 20:29:09,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 62 states have internal predecessors, (70), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (17), 10 states have call predecessors, (17), 8 states have call successors, (17) [2021-11-25 20:29:09,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 96 transitions. [2021-11-25 20:29:09,142 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 96 transitions. Word has length 215 [2021-11-25 20:29:09,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:09,143 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 96 transitions. [2021-11-25 20:29:09,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 6.0) internal successors, (138), 23 states have internal predecessors, (138), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) [2021-11-25 20:29:09,143 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 96 transitions. [2021-11-25 20:29:09,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 20:29:09,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:09,145 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] [2021-11-25 20:29:09,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:09,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 20:29:09,363 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:09,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:09,363 INFO L85 PathProgramCache]: Analyzing trace with hash -30271424, now seen corresponding path program 5 times [2021-11-25 20:29:09,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:09,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878807983] [2021-11-25 20:29:09,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:09,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:09,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:09,515 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 142 proven. 168 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2021-11-25 20:29:09,515 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:09,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878807983] [2021-11-25 20:29:09,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878807983] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:09,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194890370] [2021-11-25 20:29:09,516 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:09,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:09,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:09,517 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:09,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:29:09,593 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 20:29:09,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:09,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:29:09,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:09,798 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 196 proven. 95 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-11-25 20:29:09,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:10,385 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 196 proven. 103 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2021-11-25 20:29:10,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194890370] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:10,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [989411191] [2021-11-25 20:29:10,387 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:10,388 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:10,388 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) [2021-11-25 20:29:10,389 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:10,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 13] total 20 [2021-11-25 20:29:10,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359097319] [2021-11-25 20:29:10,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:10,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:29:10,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:10,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:29:10,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:29:10,392 INFO L87 Difference]: Start difference. First operand 81 states and 96 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 20 states have internal predecessors, (105), 12 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 12 states have call predecessors, (23), 12 states have call successors, (23) [2021-11-25 20:29:10,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:10,669 INFO L93 Difference]: Finished difference Result 161 states and 201 transitions. [2021-11-25 20:29:10,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:29:10,670 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 20 states have internal predecessors, (105), 12 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 12 states have call predecessors, (23), 12 states have call successors, (23) Word has length 122 [2021-11-25 20:29:10,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:10,671 INFO L225 Difference]: With dead ends: 161 [2021-11-25 20:29:10,672 INFO L226 Difference]: Without dead ends: 85 [2021-11-25 20:29:10,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 238 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=228, Invalid=584, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:29:10,673 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 118 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:10,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 100 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:10,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-25 20:29:10,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2021-11-25 20:29:10,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 64 states have internal predecessors, (68), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) [2021-11-25 20:29:10,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 96 transitions. [2021-11-25 20:29:10,680 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 96 transitions. Word has length 122 [2021-11-25 20:29:10,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:10,681 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 96 transitions. [2021-11-25 20:29:10,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 20 states have internal predecessors, (105), 12 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 12 states have call predecessors, (23), 12 states have call successors, (23) [2021-11-25 20:29:10,681 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 96 transitions. [2021-11-25 20:29:10,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-25 20:29:10,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:10,683 INFO L514 BasicCegarLoop]: trace histogram [16, 14, 13, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 3, 1, 1, 1, 1] [2021-11-25 20:29:10,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:10,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:29:10,904 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:10,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:10,905 INFO L85 PathProgramCache]: Analyzing trace with hash -983925103, now seen corresponding path program 6 times [2021-11-25 20:29:10,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:10,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701225456] [2021-11-25 20:29:10,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:10,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:10,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:11,124 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 78 proven. 183 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2021-11-25 20:29:11,124 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:11,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701225456] [2021-11-25 20:29:11,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701225456] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:11,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164638773] [2021-11-25 20:29:11,125 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:11,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:11,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:11,128 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:11,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:29:11,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:11,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:11,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:29:11,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:11,565 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 78 proven. 129 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2021-11-25 20:29:11,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:12,729 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 144 proven. 122 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2021-11-25 20:29:12,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164638773] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:12,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495492315] [2021-11-25 20:29:12,732 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:12,732 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:12,732 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) [2021-11-25 20:29:12,733 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:12,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2021-11-25 20:29:12,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054366701] [2021-11-25 20:29:12,734 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:12,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:29:12,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:12,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:29:12,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2021-11-25 20:29:12,736 INFO L87 Difference]: Start difference. First operand 82 states and 96 transitions. Second operand has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2021-11-25 20:29:12,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:12,896 INFO L93 Difference]: Finished difference Result 113 states and 144 transitions. [2021-11-25 20:29:12,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 20:29:12,897 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) Word has length 148 [2021-11-25 20:29:12,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:12,899 INFO L225 Difference]: With dead ends: 113 [2021-11-25 20:29:12,899 INFO L226 Difference]: Without dead ends: 112 [2021-11-25 20:29:12,900 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=293, Invalid=967, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:29:12,901 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 43 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:12,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 172 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:12,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-25 20:29:12,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 102. [2021-11-25 20:29:12,908 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) [2021-11-25 20:29:12,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 130 transitions. [2021-11-25 20:29:12,909 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 130 transitions. Word has length 148 [2021-11-25 20:29:12,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:12,910 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 130 transitions. [2021-11-25 20:29:12,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 32 states have internal predecessors, (81), 8 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (21), 21 states have call predecessors, (21), 8 states have call successors, (21) [2021-11-25 20:29:12,911 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 130 transitions. [2021-11-25 20:29:12,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-25 20:29:12,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:12,916 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] [2021-11-25 20:29:12,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:13,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:13,135 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:13,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:13,135 INFO L85 PathProgramCache]: Analyzing trace with hash 1950560215, now seen corresponding path program 7 times [2021-11-25 20:29:13,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:13,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206921299] [2021-11-25 20:29:13,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:13,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:13,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:13,351 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 507 proven. 1076 refuted. 0 times theorem prover too weak. 1685 trivial. 0 not checked. [2021-11-25 20:29:13,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:13,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206921299] [2021-11-25 20:29:13,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206921299] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:13,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004160822] [2021-11-25 20:29:13,352 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:13,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:13,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:13,353 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:13,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:29:13,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:13,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 589 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:29:13,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:14,018 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 599 proven. 1181 refuted. 0 times theorem prover too weak. 1488 trivial. 0 not checked. [2021-11-25 20:29:14,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:15,792 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 599 proven. 1253 refuted. 0 times theorem prover too weak. 1416 trivial. 0 not checked. [2021-11-25 20:29:15,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1004160822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:15,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2047446122] [2021-11-25 20:29:15,795 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:15,795 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:15,795 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) [2021-11-25 20:29:15,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:15,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2021-11-25 20:29:15,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74052813] [2021-11-25 20:29:15,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:15,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 20:29:15,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:15,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 20:29:15,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:29:15,800 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) [2021-11-25 20:29:16,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:16,457 INFO L93 Difference]: Finished difference Result 238 states and 327 transitions. [2021-11-25 20:29:16,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:29:16,458 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 [2021-11-25 20:29:16,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:16,461 INFO L225 Difference]: With dead ends: 238 [2021-11-25 20:29:16,461 INFO L226 Difference]: Without dead ends: 141 [2021-11-25 20:29:16,463 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 [2021-11-25 20:29:16,464 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 536 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 342 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 536 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 342 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:16,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [536 Valid, 122 Invalid, 709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [342 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:29:16,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-25 20:29:16,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 128. [2021-11-25 20:29:16,471 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) [2021-11-25 20:29:16,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 160 transitions. [2021-11-25 20:29:16,473 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 160 transitions. Word has length 305 [2021-11-25 20:29:16,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:16,474 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 160 transitions. [2021-11-25 20:29:16,474 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) [2021-11-25 20:29:16,475 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 160 transitions. [2021-11-25 20:29:16,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2021-11-25 20:29:16,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:16,480 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 25, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 10, 6, 1, 1, 1, 1] [2021-11-25 20:29:16,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:16,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:29:16,704 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:16,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:16,705 INFO L85 PathProgramCache]: Analyzing trace with hash -758504673, now seen corresponding path program 8 times [2021-11-25 20:29:16,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:16,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206020556] [2021-11-25 20:29:16,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:16,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:16,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:16,936 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 509 proven. 990 refuted. 0 times theorem prover too weak. 1637 trivial. 0 not checked. [2021-11-25 20:29:16,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:16,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206020556] [2021-11-25 20:29:16,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206020556] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:16,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761713554] [2021-11-25 20:29:16,937 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:16,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:16,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:16,939 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:16,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:29:17,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-25 20:29:17,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:17,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:29:17,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:17,540 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 771 proven. 527 refuted. 0 times theorem prover too weak. 1838 trivial. 0 not checked. [2021-11-25 20:29:17,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:18,766 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 779 proven. 552 refuted. 0 times theorem prover too weak. 1805 trivial. 0 not checked. [2021-11-25 20:29:18,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761713554] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:18,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [407829858] [2021-11-25 20:29:18,769 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:18,769 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:18,769 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) [2021-11-25 20:29:18,770 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:18,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 17] total 27 [2021-11-25 20:29:18,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113478000] [2021-11-25 20:29:18,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:18,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 20:29:18,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:18,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 20:29:18,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=571, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:29:18,774 INFO L87 Difference]: Start difference. First operand 128 states and 160 transitions. Second operand has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) [2021-11-25 20:29:19,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:19,293 INFO L93 Difference]: Finished difference Result 255 states and 343 transitions. [2021-11-25 20:29:19,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:29:19,294 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) Word has length 299 [2021-11-25 20:29:19,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:19,295 INFO L225 Difference]: With dead ends: 255 [2021-11-25 20:29:19,295 INFO L226 Difference]: Without dead ends: 132 [2021-11-25 20:29:19,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 631 GetRequests, 588 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=427, Invalid=1295, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 20:29:19,297 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 276 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:19,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [276 Valid, 174 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 434 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:29:19,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-25 20:29:19,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 111. [2021-11-25 20:29:19,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 87 states have internal predecessors, (92), 14 states have call successors, (14), 11 states have call predecessors, (14), 7 states have return successors, (28), 12 states have call predecessors, (28), 13 states have call successors, (28) [2021-11-25 20:29:19,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 134 transitions. [2021-11-25 20:29:19,306 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 134 transitions. Word has length 299 [2021-11-25 20:29:19,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:19,307 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 134 transitions. [2021-11-25 20:29:19,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 5.62962962962963) internal successors, (152), 27 states have internal predecessors, (152), 18 states have call successors, (27), 1 states have call predecessors, (27), 13 states have return successors, (37), 19 states have call predecessors, (37), 18 states have call successors, (37) [2021-11-25 20:29:19,307 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 134 transitions. [2021-11-25 20:29:19,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 752 [2021-11-25 20:29:19,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:19,329 INFO L514 BasicCegarLoop]: trace histogram [78, 75, 63, 39, 39, 39, 39, 38, 38, 38, 38, 38, 37, 37, 36, 36, 24, 15, 1, 1, 1, 1] [2021-11-25 20:29:19,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:19,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:29:19,544 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:19,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:19,544 INFO L85 PathProgramCache]: Analyzing trace with hash 398209034, now seen corresponding path program 9 times [2021-11-25 20:29:19,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:19,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049604216] [2021-11-25 20:29:19,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:19,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:19,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:19,965 INFO L134 CoverageAnalysis]: Checked inductivity of 20506 backedges. 1094 proven. 4277 refuted. 0 times theorem prover too weak. 15135 trivial. 0 not checked. [2021-11-25 20:29:19,965 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:19,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049604216] [2021-11-25 20:29:19,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049604216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:19,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077413532] [2021-11-25 20:29:19,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:19,966 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:19,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:19,967 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:19,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:29:20,169 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:20,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:20,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 939 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:29:20,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:21,190 INFO L134 CoverageAnalysis]: Checked inductivity of 20506 backedges. 10351 proven. 2740 refuted. 0 times theorem prover too weak. 7415 trivial. 0 not checked. [2021-11-25 20:29:21,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:23,869 INFO L134 CoverageAnalysis]: Checked inductivity of 20506 backedges. 1329 proven. 5156 refuted. 0 times theorem prover too weak. 14021 trivial. 0 not checked. [2021-11-25 20:29:23,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077413532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:23,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077310141] [2021-11-25 20:29:23,872 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:23,873 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:23,873 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) [2021-11-25 20:29:23,875 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:23,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 25] total 30 [2021-11-25 20:29:23,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044862157] [2021-11-25 20:29:23,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:23,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 20:29:23,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:23,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 20:29:23,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=730, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:29:23,881 INFO L87 Difference]: Start difference. First operand 111 states and 134 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) [2021-11-25 20:29:24,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:24,562 INFO L93 Difference]: Finished difference Result 263 states and 342 transitions. [2021-11-25 20:29:24,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 20:29:24,562 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 751 [2021-11-25 20:29:24,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:24,568 INFO L225 Difference]: With dead ends: 263 [2021-11-25 20:29:24,568 INFO L226 Difference]: Without dead ends: 157 [2021-11-25 20:29:24,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1553 GetRequests, 1497 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=796, Invalid=2284, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 20:29:24,571 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 401 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:24,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [401 Valid, 116 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:29:24,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-25 20:29:24,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 124. [2021-11-25 20:29:24,581 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) [2021-11-25 20:29:24,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 153 transitions. [2021-11-25 20:29:24,582 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 153 transitions. Word has length 751 [2021-11-25 20:29:24,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:24,585 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 153 transitions. [2021-11-25 20:29:24,586 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) [2021-11-25 20:29:24,586 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 153 transitions. [2021-11-25 20:29:24,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2021-11-25 20:29:24,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:24,595 INFO L514 BasicCegarLoop]: trace histogram [42, 40, 34, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 19, 19, 13, 8, 1, 1, 1, 1] [2021-11-25 20:29:24,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:24,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:29:24,808 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:24,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:24,808 INFO L85 PathProgramCache]: Analyzing trace with hash 127803104, now seen corresponding path program 10 times [2021-11-25 20:29:24,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:24,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759963760] [2021-11-25 20:29:24,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:24,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:24,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:25,256 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 830 proven. 1451 refuted. 0 times theorem prover too weak. 3503 trivial. 0 not checked. [2021-11-25 20:29:25,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:25,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759963760] [2021-11-25 20:29:25,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759963760] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:25,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372176149] [2021-11-25 20:29:25,257 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:29:25,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:25,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:25,270 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:25,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:29:25,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:25,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 770 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-25 20:29:25,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:26,193 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 820 proven. 1093 refuted. 0 times theorem prover too weak. 3871 trivial. 0 not checked. [2021-11-25 20:29:26,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:31,737 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 1149 proven. 996 refuted. 0 times theorem prover too weak. 3639 trivial. 0 not checked. [2021-11-25 20:29:31,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372176149] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:31,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1707842797] [2021-11-25 20:29:31,740 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:31,740 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:31,740 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) [2021-11-25 20:29:31,741 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:31,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2021-11-25 20:29:31,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581076537] [2021-11-25 20:29:31,742 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:31,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 20:29:31,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:31,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 20:29:31,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:29:31,745 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) [2021-11-25 20:29:31,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:31,962 INFO L93 Difference]: Finished difference Result 155 states and 205 transitions. [2021-11-25 20:29:31,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:29:31,963 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) Word has length 403 [2021-11-25 20:29:31,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:31,966 INFO L225 Difference]: With dead ends: 155 [2021-11-25 20:29:31,966 INFO L226 Difference]: Without dead ends: 154 [2021-11-25 20:29:31,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 889 GetRequests, 841 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1002 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:29:31,968 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 57 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:31,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 193 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:29:31,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-25 20:29:31,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 144. [2021-11-25 20:29:31,978 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) [2021-11-25 20:29:31,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 191 transitions. [2021-11-25 20:29:31,979 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 191 transitions. Word has length 403 [2021-11-25 20:29:31,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:31,981 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 191 transitions. [2021-11-25 20:29:31,981 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) [2021-11-25 20:29:31,981 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 191 transitions. [2021-11-25 20:29:31,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1223 [2021-11-25 20:29:31,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:31,995 INFO L514 BasicCegarLoop]: trace histogram [126, 123, 102, 63, 63, 63, 63, 62, 62, 62, 62, 62, 61, 61, 60, 60, 39, 24, 1, 1, 1, 1] [2021-11-25 20:29:32,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:32,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:32,220 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:32,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:32,221 INFO L85 PathProgramCache]: Analyzing trace with hash 427307584, now seen corresponding path program 11 times [2021-11-25 20:29:32,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:32,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611726969] [2021-11-25 20:29:32,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:32,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:32,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:32,834 INFO L134 CoverageAnalysis]: Checked inductivity of 54760 backedges. 2212 proven. 8825 refuted. 0 times theorem prover too weak. 43723 trivial. 0 not checked. [2021-11-25 20:29:32,834 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:32,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611726969] [2021-11-25 20:29:32,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611726969] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:32,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898384414] [2021-11-25 20:29:32,835 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:32,835 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:32,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:32,836 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:32,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:29:33,477 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2021-11-25 20:29:33,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:33,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 1564 conjuncts, 165 conjunts are in the unsatisfiable core [2021-11-25 20:29:33,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:35,752 INFO L134 CoverageAnalysis]: Checked inductivity of 54760 backedges. 16340 proven. 4556 refuted. 0 times theorem prover too weak. 33864 trivial. 0 not checked. [2021-11-25 20:29:35,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:29:52,378 INFO L134 CoverageAnalysis]: Checked inductivity of 54760 backedges. 17207 proven. 4221 refuted. 0 times theorem prover too weak. 33332 trivial. 0 not checked. [2021-11-25 20:29:52,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898384414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:29:52,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1780304919] [2021-11-25 20:29:52,380 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:29:52,380 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:29:52,381 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) [2021-11-25 20:29:52,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:29:52,383 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 38] total 65 [2021-11-25 20:29:52,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348360224] [2021-11-25 20:29:52,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:29:52,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-25 20:29:52,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:52,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-25 20:29:52,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=3618, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:29:52,388 INFO L87 Difference]: Start difference. First operand 144 states and 191 transitions. Second operand has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) [2021-11-25 20:29:55,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:55,048 INFO L93 Difference]: Finished difference Result 395 states and 605 transitions. [2021-11-25 20:29:55,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-25 20:29:55,049 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) Word has length 1222 [2021-11-25 20:29:55,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:55,053 INFO L225 Difference]: With dead ends: 395 [2021-11-25 20:29:55,053 INFO L226 Difference]: Without dead ends: 256 [2021-11-25 20:29:55,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2545 GetRequests, 2413 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5901 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2535, Invalid=15287, Unknown=0, NotChecked=0, Total=17822 [2021-11-25 20:29:55,064 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 612 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 1119 mSolverCounterSat, 412 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 612 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 1531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 412 IncrementalHoareTripleChecker+Valid, 1119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:55,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [612 Valid, 124 Invalid, 1531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [412 Valid, 1119 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:29:55,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-25 20:29:55,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 218. [2021-11-25 20:29:55,095 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) [2021-11-25 20:29:55,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 315 transitions. [2021-11-25 20:29:55,098 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 315 transitions. Word has length 1222 [2021-11-25 20:29:55,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:55,099 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 315 transitions. [2021-11-25 20:29:55,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) [2021-11-25 20:29:55,100 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 315 transitions. [2021-11-25 20:29:55,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1810 [2021-11-25 20:29:55,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:55,127 INFO L514 BasicCegarLoop]: trace histogram [187, 181, 152, 95, 95, 95, 95, 91, 91, 91, 91, 91, 90, 90, 89, 89, 57, 35, 1, 1, 1, 1] [2021-11-25 20:29:55,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:55,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:55,344 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:29:55,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:55,345 INFO L85 PathProgramCache]: Analyzing trace with hash -189177513, now seen corresponding path program 12 times [2021-11-25 20:29:55,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:55,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098668254] [2021-11-25 20:29:55,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:55,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:55,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:56,315 INFO L134 CoverageAnalysis]: Checked inductivity of 120539 backedges. 4509 proven. 13774 refuted. 0 times theorem prover too weak. 102256 trivial. 0 not checked. [2021-11-25 20:29:56,316 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:56,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098668254] [2021-11-25 20:29:56,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098668254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:56,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899388564] [2021-11-25 20:29:56,317 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:29:56,317 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:56,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:56,318 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:56,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:29:56,988 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:29:56,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:56,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 2248 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 20:29:57,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:59,143 INFO L134 CoverageAnalysis]: Checked inductivity of 120539 backedges. 23260 proven. 13819 refuted. 0 times theorem prover too weak. 83460 trivial. 0 not checked. [2021-11-25 20:29:59,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:04,888 INFO L134 CoverageAnalysis]: Checked inductivity of 120539 backedges. 5560 proven. 15718 refuted. 0 times theorem prover too weak. 99261 trivial. 0 not checked. [2021-11-25 20:30:04,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1899388564] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:04,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1084380534] [2021-11-25 20:30:04,892 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:30:04,892 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:04,892 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) [2021-11-25 20:30:04,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:04,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 31] total 36 [2021-11-25 20:30:04,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15116407] [2021-11-25 20:30:04,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:04,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 20:30:04,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:04,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 20:30:04,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1071, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:30:04,900 INFO L87 Difference]: Start difference. First operand 218 states and 315 transitions. Second operand has 36 states, 36 states have (on average 5.916666666666667) internal successors, (213), 36 states have internal predecessors, (213), 31 states have call successors, (38), 6 states have call predecessors, (38), 14 states have return successors, (43), 16 states have call predecessors, (43), 27 states have call successors, (43) [2021-11-25 20:30:05,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:05,940 INFO L93 Difference]: Finished difference Result 498 states and 799 transitions. [2021-11-25 20:30:05,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 20:30:05,941 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.916666666666667) internal successors, (213), 36 states have internal predecessors, (213), 31 states have call successors, (38), 6 states have call predecessors, (38), 14 states have return successors, (43), 16 states have call predecessors, (43), 27 states have call successors, (43) Word has length 1809 [2021-11-25 20:30:05,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:05,980 INFO L225 Difference]: With dead ends: 498 [2021-11-25 20:30:05,980 INFO L226 Difference]: Without dead ends: 285 [2021-11-25 20:30:05,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3689 GetRequests, 3617 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1145 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1309, Invalid=3803, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 20:30:05,985 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 1063 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 564 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1063 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 990 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 564 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:05,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1063 Valid, 155 Invalid, 990 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [564 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:30:05,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-25 20:30:06,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 256. [2021-11-25 20:30:06,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 207 states have (on average 1.0338164251207729) internal successors, (214), 201 states have internal predecessors, (214), 32 states have call successors, (32), 22 states have call predecessors, (32), 16 states have return successors, (114), 32 states have call predecessors, (114), 31 states have call successors, (114) [2021-11-25 20:30:06,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 360 transitions. [2021-11-25 20:30:06,005 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 360 transitions. Word has length 1809 [2021-11-25 20:30:06,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:06,007 INFO L470 AbstractCegarLoop]: Abstraction has 256 states and 360 transitions. [2021-11-25 20:30:06,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.916666666666667) internal successors, (213), 36 states have internal predecessors, (213), 31 states have call successors, (38), 6 states have call predecessors, (38), 14 states have return successors, (43), 16 states have call predecessors, (43), 27 states have call successors, (43) [2021-11-25 20:30:06,007 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 360 transitions. [2021-11-25 20:30:06,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1124 [2021-11-25 20:30:06,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:06,019 INFO L514 BasicCegarLoop]: trace histogram [115, 114, 93, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 56, 56, 36, 22, 1, 1, 1, 1] [2021-11-25 20:30:06,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:06,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:06,236 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:30:06,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:06,237 INFO L85 PathProgramCache]: Analyzing trace with hash -1034719441, now seen corresponding path program 13 times [2021-11-25 20:30:06,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:06,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745063945] [2021-11-25 20:30:06,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:06,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:06,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:06,743 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 5612 proven. 2561 refuted. 0 times theorem prover too weak. 38001 trivial. 0 not checked. [2021-11-25 20:30:06,743 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:06,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745063945] [2021-11-25 20:30:06,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745063945] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:06,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414133708] [2021-11-25 20:30:06,744 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:30:06,744 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:06,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:06,745 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:06,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:30:07,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:07,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 2101 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:30:07,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:08,891 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 25253 proven. 2667 refuted. 0 times theorem prover too weak. 18254 trivial. 0 not checked. [2021-11-25 20:30:08,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:14,122 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 3245 proven. 8582 refuted. 0 times theorem prover too weak. 34347 trivial. 0 not checked. [2021-11-25 20:30:14,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414133708] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:14,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1672847128] [2021-11-25 20:30:14,125 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:30:14,125 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:14,125 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) [2021-11-25 20:30:14,125 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:14,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 27] total 32 [2021-11-25 20:30:14,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957943749] [2021-11-25 20:30:14,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:14,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:30:14,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:14,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:30:14,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2021-11-25 20:30:14,130 INFO L87 Difference]: Start difference. First operand 256 states and 360 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) [2021-11-25 20:30:14,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:14,800 INFO L93 Difference]: Finished difference Result 496 states and 737 transitions. [2021-11-25 20:30:14,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:30:14,801 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 1123 [2021-11-25 20:30:14,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:14,807 INFO L225 Difference]: With dead ends: 496 [2021-11-25 20:30:14,807 INFO L226 Difference]: Without dead ends: 245 [2021-11-25 20:30:14,811 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2286 GetRequests, 2236 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=632, Invalid=1818, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:30:14,813 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 494 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 409 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 494 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 1018 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 409 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:14,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [494 Valid, 221 Invalid, 1018 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [409 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:30:14,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-25 20:30:14,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 209. [2021-11-25 20:30:14,834 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) [2021-11-25 20:30:14,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 280 transitions. [2021-11-25 20:30:14,838 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 280 transitions. Word has length 1123 [2021-11-25 20:30:14,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:14,839 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 280 transitions. [2021-11-25 20:30:14,840 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) [2021-11-25 20:30:14,840 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 280 transitions. [2021-11-25 20:30:14,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1424 [2021-11-25 20:30:14,857 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:14,857 INFO L514 BasicCegarLoop]: trace histogram [146, 144, 118, 73, 73, 73, 73, 72, 72, 72, 72, 72, 72, 72, 71, 71, 45, 28, 1, 1, 1, 1] [2021-11-25 20:30:14,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:15,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:15,084 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:30:15,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:15,085 INFO L85 PathProgramCache]: Analyzing trace with hash 452976576, now seen corresponding path program 14 times [2021-11-25 20:30:15,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:15,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140153769] [2021-11-25 20:30:15,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:15,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:15,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:15,727 INFO L134 CoverageAnalysis]: Checked inductivity of 74370 backedges. 8005 proven. 3643 refuted. 0 times theorem prover too weak. 62722 trivial. 0 not checked. [2021-11-25 20:30:15,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:15,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140153769] [2021-11-25 20:30:15,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140153769] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:15,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802828331] [2021-11-25 20:30:15,728 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:30:15,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:15,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:15,732 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:15,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:30:16,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-11-25 20:30:16,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:16,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:30:16,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:18,223 INFO L134 CoverageAnalysis]: Checked inductivity of 74370 backedges. 8115 proven. 1646 refuted. 0 times theorem prover too weak. 64609 trivial. 0 not checked. [2021-11-25 20:30:18,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:22,188 INFO L134 CoverageAnalysis]: Checked inductivity of 74370 backedges. 8115 proven. 1722 refuted. 0 times theorem prover too weak. 64533 trivial. 0 not checked. [2021-11-25 20:30:22,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802828331] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:22,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353321933] [2021-11-25 20:30:22,190 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:30:22,190 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:22,191 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) [2021-11-25 20:30:22,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:22,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 21] total 31 [2021-11-25 20:30:22,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026072287] [2021-11-25 20:30:22,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:22,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 20:30:22,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:22,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 20:30:22,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=756, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:30:22,198 INFO L87 Difference]: Start difference. First operand 209 states and 280 transitions. Second operand has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) [2021-11-25 20:30:22,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:22,871 INFO L93 Difference]: Finished difference Result 425 states and 573 transitions. [2021-11-25 20:30:22,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 20:30:22,872 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) Word has length 1423 [2021-11-25 20:30:22,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:22,875 INFO L225 Difference]: With dead ends: 425 [2021-11-25 20:30:22,876 INFO L226 Difference]: Without dead ends: 221 [2021-11-25 20:30:22,879 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2895 GetRequests, 2838 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 766 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=741, Invalid=2339, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 20:30:22,880 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 290 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 740 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 942 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 740 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:22,880 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 243 Invalid, 942 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 740 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:30:22,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-11-25 20:30:22,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 189. [2021-11-25 20:30:22,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 153 states have (on average 1.026143790849673) internal successors, (157), 150 states have internal predecessors, (157), 25 states have call successors, (25), 20 states have call predecessors, (25), 10 states have return successors, (52), 18 states have call predecessors, (52), 24 states have call successors, (52) [2021-11-25 20:30:22,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 234 transitions. [2021-11-25 20:30:22,893 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 234 transitions. Word has length 1423 [2021-11-25 20:30:22,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:22,895 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 234 transitions. [2021-11-25 20:30:22,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) [2021-11-25 20:30:22,895 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 234 transitions. [2021-11-25 20:30:22,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2563 [2021-11-25 20:30:22,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:22,943 INFO L514 BasicCegarLoop]: trace histogram [263, 259, 213, 132, 132, 132, 132, 130, 130, 130, 130, 130, 129, 129, 128, 128, 81, 50, 1, 1, 1, 1] [2021-11-25 20:30:22,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:23,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 20:30:23,168 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:30:23,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:23,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1512569894, now seen corresponding path program 15 times [2021-11-25 20:30:23,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:23,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746961093] [2021-11-25 20:30:23,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:23,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:23,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:24,753 INFO L134 CoverageAnalysis]: Checked inductivity of 242424 backedges. 8303 proven. 24295 refuted. 0 times theorem prover too weak. 209826 trivial. 0 not checked. [2021-11-25 20:30:24,753 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:24,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746961093] [2021-11-25 20:30:24,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746961093] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:24,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292391932] [2021-11-25 20:30:24,754 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:30:24,754 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:24,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:24,756 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:24,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:30:25,611 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:30:25,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:25,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 3177 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 20:30:25,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:28,456 INFO L134 CoverageAnalysis]: Checked inductivity of 242424 backedges. 14795 proven. 20754 refuted. 0 times theorem prover too weak. 206875 trivial. 0 not checked. [2021-11-25 20:30:28,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:36,659 INFO L134 CoverageAnalysis]: Checked inductivity of 242424 backedges. 14795 proven. 20991 refuted. 0 times theorem prover too weak. 206638 trivial. 0 not checked. [2021-11-25 20:30:36,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292391932] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:36,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1397009805] [2021-11-25 20:30:36,662 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:30:36,663 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:36,663 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) [2021-11-25 20:30:36,664 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:36,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 38] total 45 [2021-11-25 20:30:36,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33488160] [2021-11-25 20:30:36,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:36,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-25 20:30:36,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:36,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-25 20:30:36,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1700, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:30:36,671 INFO L87 Difference]: Start difference. First operand 189 states and 234 transitions. Second operand has 45 states, 45 states have (on average 5.644444444444445) internal successors, (254), 45 states have internal predecessors, (254), 39 states have call successors, (46), 4 states have call predecessors, (46), 18 states have return successors, (57), 23 states have call predecessors, (57), 36 states have call successors, (57) [2021-11-25 20:30:38,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:38,462 INFO L93 Difference]: Finished difference Result 498 states and 702 transitions. [2021-11-25 20:30:38,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-25 20:30:38,462 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 5.644444444444445) internal successors, (254), 45 states have internal predecessors, (254), 39 states have call successors, (46), 4 states have call predecessors, (46), 18 states have return successors, (57), 23 states have call predecessors, (57), 36 states have call successors, (57) Word has length 2562 [2021-11-25 20:30:38,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:38,468 INFO L225 Difference]: With dead ends: 498 [2021-11-25 20:30:38,469 INFO L226 Difference]: Without dead ends: 314 [2021-11-25 20:30:38,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5227 GetRequests, 5118 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3006 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2685, Invalid=9087, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 20:30:38,473 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 1577 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 889 mSolverCounterSat, 1181 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1577 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 2070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1181 IncrementalHoareTripleChecker+Valid, 889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:38,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1577 Valid, 244 Invalid, 2070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1181 Valid, 889 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:30:38,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-11-25 20:30:38,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 276. [2021-11-25 20:30:38,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 225 states have (on average 1.0355555555555556) internal successors, (233), 221 states have internal predecessors, (233), 38 states have call successors, (38), 32 states have call predecessors, (38), 12 states have return successors, (97), 22 states have call predecessors, (97), 37 states have call successors, (97) [2021-11-25 20:30:38,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 368 transitions. [2021-11-25 20:30:38,493 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 368 transitions. Word has length 2562 [2021-11-25 20:30:38,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:38,495 INFO L470 AbstractCegarLoop]: Abstraction has 276 states and 368 transitions. [2021-11-25 20:30:38,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 5.644444444444445) internal successors, (254), 45 states have internal predecessors, (254), 39 states have call successors, (46), 4 states have call predecessors, (46), 18 states have return successors, (57), 23 states have call predecessors, (57), 36 states have call successors, (57) [2021-11-25 20:30:38,496 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 368 transitions. [2021-11-25 20:30:38,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1477 [2021-11-25 20:30:38,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:38,514 INFO L514 BasicCegarLoop]: trace histogram [151, 150, 122, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 74, 74, 47, 29, 1, 1, 1, 1] [2021-11-25 20:30:38,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:38,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 20:30:38,734 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:30:38,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:38,735 INFO L85 PathProgramCache]: Analyzing trace with hash 335539351, now seen corresponding path program 16 times [2021-11-25 20:30:38,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:38,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387466677] [2021-11-25 20:30:38,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:38,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:38,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:39,412 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 6528 proven. 10102 refuted. 0 times theorem prover too weak. 63427 trivial. 0 not checked. [2021-11-25 20:30:39,412 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:39,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387466677] [2021-11-25 20:30:39,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387466677] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:39,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379278908] [2021-11-25 20:30:39,413 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:30:39,413 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:39,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:39,414 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:39,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 20:30:40,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:40,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 2753 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 20:30:40,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:42,036 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 7303 proven. 10882 refuted. 0 times theorem prover too weak. 61872 trivial. 0 not checked. [2021-11-25 20:30:42,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:48,023 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 7303 proven. 11117 refuted. 0 times theorem prover too weak. 61637 trivial. 0 not checked. [2021-11-25 20:30:48,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [379278908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:48,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [434997101] [2021-11-25 20:30:48,026 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:30:48,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:48,026 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) [2021-11-25 20:30:48,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:48,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 35] total 40 [2021-11-25 20:30:48,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759070935] [2021-11-25 20:30:48,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:48,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:30:48,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:48,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:30:48,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:30:48,033 INFO L87 Difference]: Start difference. First operand 276 states and 368 transitions. Second operand has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) [2021-11-25 20:30:49,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:49,096 INFO L93 Difference]: Finished difference Result 596 states and 837 transitions. [2021-11-25 20:30:49,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 20:30:49,097 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) Word has length 1476 [2021-11-25 20:30:49,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:49,102 INFO L225 Difference]: With dead ends: 596 [2021-11-25 20:30:49,102 INFO L226 Difference]: Without dead ends: 325 [2021-11-25 20:30:49,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3008 GetRequests, 2944 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=999, Invalid=3033, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 20:30:49,110 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 753 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 771 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 753 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 1643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 771 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:49,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [753 Valid, 278 Invalid, 1643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [771 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:30:49,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2021-11-25 20:30:49,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 241. [2021-11-25 20:30:49,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 195 states have (on average 1.0256410256410255) internal successors, (200), 193 states have internal predecessors, (200), 33 states have call successors, (33), 26 states have call predecessors, (33), 12 states have return successors, (92), 21 states have call predecessors, (92), 32 states have call successors, (92) [2021-11-25 20:30:49,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 325 transitions. [2021-11-25 20:30:49,140 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 325 transitions. Word has length 1476 [2021-11-25 20:30:49,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:49,141 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 325 transitions. [2021-11-25 20:30:49,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) [2021-11-25 20:30:49,142 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 325 transitions. [2021-11-25 20:30:49,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1738 [2021-11-25 20:30:49,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:49,213 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] [2021-11-25 20:30:49,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:49,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 20:30:49,428 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:30:49,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:49,430 INFO L85 PathProgramCache]: Analyzing trace with hash -956644368, now seen corresponding path program 17 times [2021-11-25 20:30:49,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:49,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455426243] [2021-11-25 20:30:49,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:49,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:49,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:51,347 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18642 proven. 26756 refuted. 0 times theorem prover too weak. 65661 trivial. 0 not checked. [2021-11-25 20:30:51,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:51,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455426243] [2021-11-25 20:30:51,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455426243] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:51,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778199708] [2021-11-25 20:30:51,347 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:30:51,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:51,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:51,349 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:51,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 20:30:52,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 128 check-sat command(s) [2021-11-25 20:30:52,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:52,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 3214 conjuncts, 353 conjunts are in the unsatisfiable core [2021-11-25 20:30:52,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:56,023 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18335 proven. 20467 refuted. 0 times theorem prover too weak. 72257 trivial. 0 not checked. [2021-11-25 20:30:56,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:58,225 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 20425 proven. 19582 refuted. 0 times theorem prover too weak. 71052 trivial. 0 not checked. [2021-11-25 20:31:58,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778199708] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:58,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649498039] [2021-11-25 20:31:58,228 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:31:58,228 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:58,228 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) [2021-11-25 20:31:58,245 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:58,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27, 47] total 66 [2021-11-25 20:31:58,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115222560] [2021-11-25 20:31:58,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:58,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 20:31:58,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:58,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 20:31:58,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=3470, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 20:31:58,256 INFO L87 Difference]: Start difference. First operand 241 states and 325 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) [2021-11-25 20:31:58,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:58,494 INFO L93 Difference]: Finished difference Result 270 states and 375 transitions. [2021-11-25 20:31:58,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 20:31:58,495 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 [2021-11-25 20:31:58,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:58,500 INFO L225 Difference]: With dead ends: 270 [2021-11-25 20:31:58,500 INFO L226 Difference]: Without dead ends: 269 [2021-11-25 20:31:58,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3829 GetRequests, 3760 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2205 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1063, Invalid=3907, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 20:31:58,502 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 96 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:58,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 306 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:31:58,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-25 20:31:58,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 263. [2021-11-25 20:31:58,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 213 states have (on average 1.0234741784037558) internal successors, (218), 209 states have internal predecessors, (218), 35 states have call successors, (35), 26 states have call predecessors, (35), 14 states have return successors, (112), 27 states have call predecessors, (112), 34 states have call successors, (112) [2021-11-25 20:31:58,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 365 transitions. [2021-11-25 20:31:58,521 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 365 transitions. Word has length 1737 [2021-11-25 20:31:58,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:58,523 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 365 transitions. [2021-11-25 20:31:58,523 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) [2021-11-25 20:31:58,524 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 365 transitions. [2021-11-25 20:31:58,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3478 [2021-11-25 20:31:58,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:58,605 INFO L514 BasicCegarLoop]: trace histogram [355, 354, 287, 177, 177, 177, 177, 177, 177, 177, 177, 177, 177, 177, 176, 176, 110, 68, 1, 1, 1, 1] [2021-11-25 20:31:58,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:58,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:58,807 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:31:58,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:58,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1472994641, now seen corresponding path program 18 times [2021-11-25 20:31:58,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:58,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076879920] [2021-11-25 20:31:58,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:58,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:59,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:01,305 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 15360 proven. 36406 refuted. 0 times theorem prover too weak. 395491 trivial. 0 not checked. [2021-11-25 20:32:01,305 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:01,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076879920] [2021-11-25 20:32:01,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076879920] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:01,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483792361] [2021-11-25 20:32:01,306 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:32:01,306 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:01,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:01,306 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:01,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 20:32:02,928 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:32:02,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:02,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 4303 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 20:32:02,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:06,808 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 205444 proven. 20731 refuted. 0 times theorem prover too weak. 221082 trivial. 0 not checked. [2021-11-25 20:32:06,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:19,787 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 15340 proven. 37961 refuted. 0 times theorem prover too weak. 393956 trivial. 0 not checked. [2021-11-25 20:32:19,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483792361] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:19,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [413048740] [2021-11-25 20:32:19,790 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:32:19,790 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:19,791 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) [2021-11-25 20:32:19,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:19,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 39] total 44 [2021-11-25 20:32:19,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067760517] [2021-11-25 20:32:19,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:19,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:32:19,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:19,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:32:19,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1581, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:32:19,804 INFO L87 Difference]: Start difference. First operand 263 states and 365 transitions. Second operand has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) [2021-11-25 20:32:20,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:20,947 INFO L93 Difference]: Finished difference Result 540 states and 768 transitions. [2021-11-25 20:32:20,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 20:32:20,948 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) Word has length 3477 [2021-11-25 20:32:20,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:20,953 INFO L225 Difference]: With dead ends: 540 [2021-11-25 20:32:20,954 INFO L226 Difference]: Without dead ends: 282 [2021-11-25 20:32:20,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7019 GetRequests, 6948 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1120 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1214, Invalid=3756, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 20:32:20,957 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 845 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 1131 mSolverCounterSat, 879 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 845 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 2010 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 879 IncrementalHoareTripleChecker+Valid, 1131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:20,958 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [845 Valid, 340 Invalid, 2010 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [879 Valid, 1131 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:32:20,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-11-25 20:32:20,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 210. [2021-11-25 20:32:20,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 169 states have (on average 1.017751479289941) internal successors, (172), 167 states have internal predecessors, (172), 28 states have call successors, (28), 20 states have call predecessors, (28), 12 states have return successors, (81), 22 states have call predecessors, (81), 27 states have call successors, (81) [2021-11-25 20:32:20,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 281 transitions. [2021-11-25 20:32:20,973 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 281 transitions. Word has length 3477 [2021-11-25 20:32:20,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:20,975 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 281 transitions. [2021-11-25 20:32:20,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) [2021-11-25 20:32:20,976 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 281 transitions. [2021-11-25 20:32:21,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8492 [2021-11-25 20:32:21,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:21,335 INFO L514 BasicCegarLoop]: trace histogram [869, 861, 704, 437, 437, 437, 437, 431, 431, 431, 431, 431, 430, 430, 429, 429, 267, 165, 1, 1, 1, 1] [2021-11-25 20:32:21,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:21,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 20:32:21,536 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:32:21,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:21,538 INFO L85 PathProgramCache]: Analyzing trace with hash 1160013271, now seen corresponding path program 19 times [2021-11-25 20:32:21,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:21,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225326236] [2021-11-25 20:32:21,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:21,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:24,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:29,722 INFO L134 CoverageAnalysis]: Checked inductivity of 2674942 backedges. 23490 proven. 103426 refuted. 0 times theorem prover too weak. 2548026 trivial. 0 not checked. [2021-11-25 20:32:29,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:29,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225326236] [2021-11-25 20:32:29,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225326236] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:29,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989781211] [2021-11-25 20:32:29,723 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:32:29,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:29,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:29,732 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:29,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:32:32,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:32,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 15704 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-25 20:32:32,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:42,295 INFO L134 CoverageAnalysis]: Checked inductivity of 2674942 backedges. 1213749 proven. 66136 refuted. 0 times theorem prover too weak. 1395057 trivial. 0 not checked. [2021-11-25 20:32:42,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:05,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2674942 backedges. 28003 proven. 113907 refuted. 0 times theorem prover too weak. 2533032 trivial. 0 not checked. [2021-11-25 20:33:05,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989781211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:05,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1992768003] [2021-11-25 20:33:05,880 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:33:05,880 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:05,881 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) [2021-11-25 20:33:05,881 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:05,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 41] total 46 [2021-11-25 20:33:05,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120061849] [2021-11-25 20:33:05,887 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:05,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 20:33:05,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:05,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 20:33:05,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1777, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:33:05,895 INFO L87 Difference]: Start difference. First operand 210 states and 281 transitions. Second operand has 46 states, 46 states have (on average 5.891304347826087) internal successors, (271), 46 states have internal predecessors, (271), 41 states have call successors, (48), 8 states have call predecessors, (48), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) [2021-11-25 20:33:07,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:07,808 INFO L93 Difference]: Finished difference Result 542 states and 790 transitions. [2021-11-25 20:33:07,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-25 20:33:07,808 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.891304347826087) internal successors, (271), 46 states have internal predecessors, (271), 41 states have call successors, (48), 8 states have call predecessors, (48), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) Word has length 8491 [2021-11-25 20:33:07,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:07,830 INFO L225 Difference]: With dead ends: 542 [2021-11-25 20:33:07,830 INFO L226 Difference]: Without dead ends: 337 [2021-11-25 20:33:07,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17091 GetRequests, 16982 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3030 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2910, Invalid=8862, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 20:33:07,836 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 1204 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 706 mSolverCounterSat, 714 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1204 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 1420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 714 IncrementalHoareTripleChecker+Valid, 706 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:07,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1204 Valid, 223 Invalid, 1420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [714 Valid, 706 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:33:07,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2021-11-25 20:33:07,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 270. [2021-11-25 20:33:07,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 219 states have (on average 1.0228310502283104) internal successors, (224), 216 states have internal predecessors, (224), 37 states have call successors, (37), 29 states have call predecessors, (37), 13 states have return successors, (108), 24 states have call predecessors, (108), 36 states have call successors, (108) [2021-11-25 20:33:07,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 369 transitions. [2021-11-25 20:33:07,863 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 369 transitions. Word has length 8491 [2021-11-25 20:33:07,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:07,868 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 369 transitions. [2021-11-25 20:33:07,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.891304347826087) internal successors, (271), 46 states have internal predecessors, (271), 41 states have call successors, (48), 8 states have call predecessors, (48), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) [2021-11-25 20:33:07,868 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 369 transitions. [2021-11-25 20:33:07,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3896 [2021-11-25 20:33:07,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:07,986 INFO L514 BasicCegarLoop]: trace histogram [398, 396, 322, 199, 199, 199, 199, 198, 198, 198, 198, 198, 198, 198, 197, 197, 123, 76, 1, 1, 1, 1] [2021-11-25 20:33:08,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-25 20:33:08,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 20:33:08,186 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:33:08,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:08,187 INFO L85 PathProgramCache]: Analyzing trace with hash -1043121312, now seen corresponding path program 20 times [2021-11-25 20:33:08,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:08,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334721337] [2021-11-25 20:33:08,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:08,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:09,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:10,579 INFO L134 CoverageAnalysis]: Checked inductivity of 561534 backedges. 23254 proven. 36223 refuted. 0 times theorem prover too weak. 502057 trivial. 0 not checked. [2021-11-25 20:33:10,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:10,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334721337] [2021-11-25 20:33:10,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334721337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:10,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69919706] [2021-11-25 20:33:10,580 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:33:10,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:10,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:10,581 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:10,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 20:33:12,796 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 77 check-sat command(s) [2021-11-25 20:33:12,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:12,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 2078 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 20:33:12,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:17,187 INFO L134 CoverageAnalysis]: Checked inductivity of 561534 backedges. 18426 proven. 32721 refuted. 0 times theorem prover too weak. 510387 trivial. 0 not checked. [2021-11-25 20:33:17,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:29,776 INFO L134 CoverageAnalysis]: Checked inductivity of 561534 backedges. 18426 proven. 33018 refuted. 0 times theorem prover too weak. 510090 trivial. 0 not checked. [2021-11-25 20:33:29,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69919706] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:29,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1382739125] [2021-11-25 20:33:29,778 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 20:33:29,778 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:29,778 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) [2021-11-25 20:33:29,779 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:29,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 21, 35] total 43 [2021-11-25 20:33:29,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753953217] [2021-11-25 20:33:29,782 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:29,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 20:33:29,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:29,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 20:33:29,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1493, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:33:29,785 INFO L87 Difference]: Start difference. First operand 270 states and 369 transitions. Second operand has 43 states, 43 states have (on average 5.813953488372093) internal successors, (250), 43 states have internal predecessors, (250), 35 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 35 states have call successors, (61) [2021-11-25 20:33:31,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:31,059 INFO L93 Difference]: Finished difference Result 585 states and 821 transitions. [2021-11-25 20:33:31,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 20:33:31,060 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 5.813953488372093) internal successors, (250), 43 states have internal predecessors, (250), 35 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 35 states have call successors, (61) Word has length 3895 [2021-11-25 20:33:31,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:31,064 INFO L225 Difference]: With dead ends: 585 [2021-11-25 20:33:31,065 INFO L226 Difference]: Without dead ends: 320 [2021-11-25 20:33:31,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7863 GetRequests, 7787 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1316 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1382, Invalid=4318, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 20:33:31,068 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 665 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 1565 mSolverCounterSat, 606 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 665 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 2171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 606 IncrementalHoareTripleChecker+Valid, 1565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:31,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [665 Valid, 459 Invalid, 2171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [606 Valid, 1565 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:33:31,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-11-25 20:33:31,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 229. [2021-11-25 20:33:31,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 184 states have (on average 1.016304347826087) internal successors, (187), 183 states have internal predecessors, (187), 31 states have call successors, (31), 22 states have call predecessors, (31), 13 states have return successors, (95), 23 states have call predecessors, (95), 30 states have call successors, (95) [2021-11-25 20:33:31,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 313 transitions. [2021-11-25 20:33:31,088 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 313 transitions. Word has length 3895 [2021-11-25 20:33:31,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:31,090 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 313 transitions. [2021-11-25 20:33:31,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 5.813953488372093) internal successors, (250), 43 states have internal predecessors, (250), 35 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 35 states have call successors, (61) [2021-11-25 20:33:31,091 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 313 transitions. [2021-11-25 20:33:31,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4557 [2021-11-25 20:33:31,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:31,354 INFO L514 BasicCegarLoop]: trace histogram [465, 464, 376, 232, 232, 232, 232, 232, 232, 232, 232, 232, 232, 232, 231, 231, 144, 89, 1, 1, 1, 1] [2021-11-25 20:33:31,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:31,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 20:33:31,554 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-25 20:33:31,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:31,556 INFO L85 PathProgramCache]: Analyzing trace with hash -1846971216, now seen corresponding path program 21 times [2021-11-25 20:33:31,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:31,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726187322] [2021-11-25 20:33:31,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:31,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:33,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:37,588 INFO L134 CoverageAnalysis]: Checked inductivity of 768821 backedges. 134587 proven. 182534 refuted. 0 times theorem prover too weak. 451700 trivial. 0 not checked. [2021-11-25 20:33:37,588 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:37,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726187322] [2021-11-25 20:33:37,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726187322] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:37,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178720334] [2021-11-25 20:33:37,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:33:37,589 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:37,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:37,590 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:37,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec78b7f-1489-4f88-8788-6a46e22724bb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 20:33:39,996 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:33:39,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:40,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 8442 conjuncts, 929 conjunts are in the unsatisfiable core [2021-11-25 20:33:40,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:48,533 INFO L134 CoverageAnalysis]: Checked inductivity of 768821 backedges. 132268 proven. 139641 refuted. 0 times theorem prover too weak. 496912 trivial. 0 not checked. [2021-11-25 20:33:48,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:48,314 WARN L227 SmtUtils]: Spent 11.89s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 234] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-25 20:37:00,396 WARN L227 SmtUtils]: Spent 12.02s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 271] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-25 20:37:12,417 WARN L227 SmtUtils]: Spent 11.99s on a formula simplification that was a NOOP. DAG size: 1294 (called from [L 234] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-25 20:37:25,047 WARN L227 SmtUtils]: Spent 12.51s on a formula simplification that was a NOOP. DAG size: 1294 (called from [L 271] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-25 20:38:57,373 WARN L227 SmtUtils]: Spent 5.65s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 234] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-25 20:39:03,024 WARN L227 SmtUtils]: Spent 5.62s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 271] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-25 20:39:08,714 WARN L227 SmtUtils]: Spent 5.67s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 234] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-25 20:39:14,497 WARN L227 SmtUtils]: Spent 5.75s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 271] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition)