./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci04.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 13:58:31,862 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 13:58:31,864 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 13:58:31,882 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 13:58:31,883 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 13:58:31,884 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 13:58:31,885 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 13:58:31,887 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 13:58:31,888 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 13:58:31,889 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 13:58:31,890 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 13:58:31,891 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 13:58:31,891 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 13:58:31,892 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 13:58:31,893 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 13:58:31,894 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 13:58:31,895 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 13:58:31,896 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 13:58:31,898 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 13:58:31,899 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 13:58:31,901 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 13:58:31,902 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 13:58:31,903 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 13:58:31,904 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 13:58:31,908 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 13:58:31,908 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 13:58:31,908 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 13:58:31,909 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 13:58:31,910 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 13:58:31,910 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 13:58:31,911 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 13:58:31,912 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 13:58:31,912 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 13:58:31,913 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 13:58:31,914 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 13:58:31,914 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 13:58:31,915 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 13:58:31,915 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 13:58:31,915 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 13:58:31,916 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 13:58:31,917 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 13:58:31,918 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/config/svcomp-Overflow-32bit-Taipan_Default.epf [2022-12-14 13:58:31,939 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 13:58:31,939 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 13:58:31,940 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 13:58:31,940 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 13:58:31,941 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 13:58:31,941 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 13:58:31,941 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 13:58:31,941 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 13:58:31,941 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 13:58:31,942 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 13:58:31,942 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 13:58:31,942 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 13:58:31,942 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 13:58:31,942 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 13:58:31,942 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 13:58:31,943 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 13:58:31,943 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 13:58:31,943 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 13:58:31,944 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 13:58:31,944 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 13:58:31,944 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 13:58:31,944 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 13:58:31,945 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 13:58:31,945 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 13:58:31,945 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 13:58:31,945 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 13:58:31,945 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 13:58:31,945 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-12-14 13:58:31,946 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 13:58:31,946 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 13:58:31,946 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 13:58:31,946 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 13:58:31,946 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 13:58:31,947 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 13:58:31,947 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:58:31,947 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 13:58:31,947 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 13:58:31,947 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 13:58:31,948 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 13:58:31,948 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 13:58:31,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 13:58:31,948 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 13:58:31,948 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 13:58:31,948 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 [2022-12-14 13:58:32,161 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 13:58:32,180 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 13:58:32,183 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 13:58:32,184 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 13:58:32,184 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 13:58:32,185 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/recursive/Fibonacci04.c [2022-12-14 13:58:34,736 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 13:58:34,905 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 13:58:34,906 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/sv-benchmarks/c/recursive/Fibonacci04.c [2022-12-14 13:58:34,910 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/data/d080c5095/38b5d09b90e64b378e62463e90a79329/FLAG2637202c2 [2022-12-14 13:58:35,305 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/data/d080c5095/38b5d09b90e64b378e62463e90a79329 [2022-12-14 13:58:35,307 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 13:58:35,309 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 13:58:35,310 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 13:58:35,310 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 13:58:35,313 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 13:58:35,314 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,314 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ddcfa3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35, skipping insertion in model container [2022-12-14 13:58:35,315 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,320 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 13:58:35,330 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 13:58:35,472 WARN L237 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_8f82d20a-9071-478b-ad45-ae69471602a0/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2022-12-14 13:58:35,472 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:58:35,480 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 13:58:35,490 WARN L237 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_8f82d20a-9071-478b-ad45-ae69471602a0/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2022-12-14 13:58:35,490 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:58:35,500 INFO L208 MainTranslator]: Completed translation [2022-12-14 13:58:35,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35 WrapperNode [2022-12-14 13:58:35,500 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 13:58:35,501 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 13:58:35,501 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 13:58:35,501 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 13:58:35,507 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,511 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,522 INFO L138 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 23 [2022-12-14 13:58:35,523 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 13:58:35,523 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 13:58:35,523 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 13:58:35,523 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 13:58:35,529 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,530 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,531 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,532 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,533 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,534 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,535 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,536 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 13:58:35,536 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 13:58:35,536 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 13:58:35,536 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 13:58:35,537 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (1/1) ... [2022-12-14 13:58:35,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:58:35,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:35,560 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 13:58:35,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 13:58:35,596 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2022-12-14 13:58:35,597 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2022-12-14 13:58:35,597 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 13:58:35,597 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 13:58:35,597 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 13:58:35,597 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 13:58:35,654 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 13:58:35,656 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 13:58:35,741 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 13:58:35,762 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 13:58:35,762 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-12-14 13:58:35,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:58:35 BoogieIcfgContainer [2022-12-14 13:58:35,764 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 13:58:35,766 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 13:58:35,766 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 13:58:35,769 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 13:58:35,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:58:35" (1/3) ... [2022-12-14 13:58:35,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62d5aabb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:58:35, skipping insertion in model container [2022-12-14 13:58:35,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:35" (2/3) ... [2022-12-14 13:58:35,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62d5aabb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:58:35, skipping insertion in model container [2022-12-14 13:58:35,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:58:35" (3/3) ... [2022-12-14 13:58:35,771 INFO L112 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2022-12-14 13:58:35,784 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 13:58:35,785 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2022-12-14 13:58:35,819 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 13:58:35,823 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@47ab6b5e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 13:58:35,823 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2022-12-14 13:58:35,826 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 13:58:35,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 13:58:35,832 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:35,832 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 13:58:35,832 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:35,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:35,836 INFO L85 PathProgramCache]: Analyzing trace with hash -2020330972, now seen corresponding path program 1 times [2022-12-14 13:58:35,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:35,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117163878] [2022-12-14 13:58:35,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:35,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:35,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:35,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:35,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:35,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117163878] [2022-12-14 13:58:35,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117163878] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:58:35,961 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:58:35,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 13:58:35,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154157880] [2022-12-14 13:58:35,963 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:58:35,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 13:58:35,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:35,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 13:58:35,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:58:35,990 INFO L87 Difference]: Start difference. First operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:58:36,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:36,033 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2022-12-14 13:58:36,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 13:58:36,036 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 13:58:36,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:36,042 INFO L225 Difference]: With dead ends: 27 [2022-12-14 13:58:36,042 INFO L226 Difference]: Without dead ends: 23 [2022-12-14 13:58:36,044 INFO L412 NwaCegarLoop]: 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 [2022-12-14 13:58:36,053 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 14 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:36,054 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 22 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:58:36,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-12-14 13:58:36,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2022-12-14 13:58:36,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 13:58:36,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-12-14 13:58:36,079 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 6 [2022-12-14 13:58:36,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:36,079 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-12-14 13:58:36,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:58:36,079 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-12-14 13:58:36,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 13:58:36,080 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:36,080 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:36,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 13:58:36,080 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:36,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:36,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1794249350, now seen corresponding path program 1 times [2022-12-14 13:58:36,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:36,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167320351] [2022-12-14 13:58:36,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:36,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:36,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:36,134 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:36,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:36,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167320351] [2022-12-14 13:58:36,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167320351] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:58:36,135 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:58:36,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 13:58:36,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951079095] [2022-12-14 13:58:36,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:58:36,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:58:36,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:36,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:58:36,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 13:58:36,137 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:58:36,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:36,179 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2022-12-14 13:58:36,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 13:58:36,180 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 13:58:36,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:36,181 INFO L225 Difference]: With dead ends: 21 [2022-12-14 13:58:36,181 INFO L226 Difference]: Without dead ends: 19 [2022-12-14 13:58:36,181 INFO L412 NwaCegarLoop]: 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 [2022-12-14 13:58:36,183 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 28 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:36,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 17 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:58:36,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-12-14 13:58:36,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-12-14 13:58:36,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 13:58:36,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-12-14 13:58:36,189 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 7 [2022-12-14 13:58:36,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:36,189 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-12-14 13:58:36,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:58:36,189 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-12-14 13:58:36,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 13:58:36,190 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:36,190 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:36,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 13:58:36,191 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:36,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:36,192 INFO L85 PathProgramCache]: Analyzing trace with hash -542004053, now seen corresponding path program 1 times [2022-12-14 13:58:36,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:36,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295129112] [2022-12-14 13:58:36,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:36,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:36,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:36,317 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 13:58:36,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:36,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295129112] [2022-12-14 13:58:36,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295129112] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:58:36,317 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:58:36,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 13:58:36,317 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112955858] [2022-12-14 13:58:36,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:58:36,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:58:36,318 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:36,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:58:36,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 13:58:36,320 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 13:58:36,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:36,356 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-12-14 13:58:36,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 13:58:36,357 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-12-14 13:58:36,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:36,357 INFO L225 Difference]: With dead ends: 35 [2022-12-14 13:58:36,357 INFO L226 Difference]: Without dead ends: 33 [2022-12-14 13:58:36,358 INFO L412 NwaCegarLoop]: 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 [2022-12-14 13:58:36,359 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:36,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 45 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:58:36,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-12-14 13:58:36,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2022-12-14 13:58:36,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-12-14 13:58:36,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2022-12-14 13:58:36,366 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 28 [2022-12-14 13:58:36,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:36,367 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2022-12-14 13:58:36,367 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 13:58:36,367 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2022-12-14 13:58:36,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 13:58:36,368 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:36,368 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:36,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 13:58:36,368 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:36,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:36,369 INFO L85 PathProgramCache]: Analyzing trace with hash 389206339, now seen corresponding path program 1 times [2022-12-14 13:58:36,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:36,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451106418] [2022-12-14 13:58:36,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:36,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:36,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:36,472 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 13:58:36,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:36,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451106418] [2022-12-14 13:58:36,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451106418] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:36,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251541168] [2022-12-14 13:58:36,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:36,473 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:36,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:36,474 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:36,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 13:58:36,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:36,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 13:58:36,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:36,600 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 13:58:36,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:36,720 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 13:58:36,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251541168] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:36,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1636070241] [2022-12-14 13:58:36,735 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 13:58:36,735 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:36,738 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:36,739 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:36,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2022-12-14 13:58:36,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116686351] [2022-12-14 13:58:36,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:36,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-12-14 13:58:36,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:36,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-12-14 13:58:36,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-12-14 13:58:36,741 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-12-14 13:58:36,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:36,950 INFO L93 Difference]: Finished difference Result 89 states and 127 transitions. [2022-12-14 13:58:36,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 13:58:36,951 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 29 [2022-12-14 13:58:36,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:36,952 INFO L225 Difference]: With dead ends: 89 [2022-12-14 13:58:36,952 INFO L226 Difference]: Without dead ends: 63 [2022-12-14 13:58:36,953 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2022-12-14 13:58:36,954 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 168 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:36,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 55 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:36,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-12-14 13:58:36,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 51. [2022-12-14 13:58:36,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 40 states have internal predecessors, (41), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2022-12-14 13:58:36,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 66 transitions. [2022-12-14 13:58:36,963 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 66 transitions. Word has length 29 [2022-12-14 13:58:36,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:36,963 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 66 transitions. [2022-12-14 13:58:36,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-12-14 13:58:36,963 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 66 transitions. [2022-12-14 13:58:36,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 13:58:36,964 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:36,964 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:36,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 13:58:37,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:37,167 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:37,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:37,168 INFO L85 PathProgramCache]: Analyzing trace with hash -294911484, now seen corresponding path program 2 times [2022-12-14 13:58:37,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:37,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966312056] [2022-12-14 13:58:37,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:37,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:37,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:37,335 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 13:58:37,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:37,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966312056] [2022-12-14 13:58:37,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966312056] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:37,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [381825252] [2022-12-14 13:58:37,336 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:58:37,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:37,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:37,337 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:37,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 13:58:37,368 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 13:58:37,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:37,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 13:58:37,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:37,405 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 13:58:37,405 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:58:37,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [381825252] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:58:37,405 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:58:37,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2022-12-14 13:58:37,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096751252] [2022-12-14 13:58:37,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:58:37,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:58:37,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:37,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:58:37,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-12-14 13:58:37,407 INFO L87 Difference]: Start difference. First operand 51 states and 66 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 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) [2022-12-14 13:58:37,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:37,433 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2022-12-14 13:58:37,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 13:58:37,434 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 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 23 [2022-12-14 13:58:37,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:37,436 INFO L225 Difference]: With dead ends: 59 [2022-12-14 13:58:37,436 INFO L226 Difference]: Without dead ends: 58 [2022-12-14 13:58:37,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-12-14 13:58:37,437 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:37,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 51 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:58:37,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-12-14 13:58:37,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2022-12-14 13:58:37,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 41 states have internal predecessors, (43), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 9 states have call predecessors, (18), 6 states have call successors, (18) [2022-12-14 13:58:37,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2022-12-14 13:58:37,450 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 23 [2022-12-14 13:58:37,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:37,450 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2022-12-14 13:58:37,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 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) [2022-12-14 13:58:37,451 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2022-12-14 13:58:37,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 13:58:37,452 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:37,452 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:37,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 13:58:37,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:37,653 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:37,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:37,654 INFO L85 PathProgramCache]: Analyzing trace with hash -552321358, now seen corresponding path program 1 times [2022-12-14 13:58:37,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:37,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337572504] [2022-12-14 13:58:37,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:37,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:37,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:37,702 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 13:58:37,702 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:37,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337572504] [2022-12-14 13:58:37,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337572504] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:37,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654383991] [2022-12-14 13:58:37,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:37,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:37,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:37,704 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:37,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 13:58:37,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:37,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 13:58:37,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:37,786 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 13:58:37,786 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:58:37,786 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654383991] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:58:37,786 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:58:37,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 9 [2022-12-14 13:58:37,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606833009] [2022-12-14 13:58:37,787 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:58:37,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 13:58:37,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:37,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 13:58:37,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-12-14 13:58:37,788 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 6 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) [2022-12-14 13:58:37,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:37,820 INFO L93 Difference]: Finished difference Result 82 states and 115 transitions. [2022-12-14 13:58:37,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:58:37,820 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 6 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 24 [2022-12-14 13:58:37,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:37,822 INFO L225 Difference]: With dead ends: 82 [2022-12-14 13:58:37,822 INFO L226 Difference]: Without dead ends: 81 [2022-12-14 13:58:37,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-12-14 13:58:37,823 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 4 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:37,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 46 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:58:37,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-12-14 13:58:37,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 62. [2022-12-14 13:58:37,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 48 states have internal predecessors, (50), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 11 states have call predecessors, (27), 7 states have call successors, (27) [2022-12-14 13:58:37,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 85 transitions. [2022-12-14 13:58:37,838 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 85 transitions. Word has length 24 [2022-12-14 13:58:37,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:37,839 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 85 transitions. [2022-12-14 13:58:37,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 6 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) [2022-12-14 13:58:37,839 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 85 transitions. [2022-12-14 13:58:37,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 13:58:37,840 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:37,841 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-12-14 13:58:37,845 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 13:58:38,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:38,042 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:38,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:38,043 INFO L85 PathProgramCache]: Analyzing trace with hash 922236772, now seen corresponding path program 1 times [2022-12-14 13:58:38,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:38,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029231843] [2022-12-14 13:58:38,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:38,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:38,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:38,252 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 13:58:38,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:38,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029231843] [2022-12-14 13:58:38,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029231843] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:38,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800507793] [2022-12-14 13:58:38,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:38,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:38,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:38,254 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:38,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 13:58:38,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:38,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 13:58:38,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:38,361 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-12-14 13:58:38,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:38,513 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 13:58:38,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800507793] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:38,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1369327728] [2022-12-14 13:58:38,516 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:38,516 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:38,516 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:38,516 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:38,517 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2022-12-14 13:58:38,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781820354] [2022-12-14 13:58:38,517 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:38,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 13:58:38,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:38,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 13:58:38,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-12-14 13:58:38,519 INFO L87 Difference]: Start difference. First operand 62 states and 85 transitions. Second operand has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 16 states have internal predecessors, (43), 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) [2022-12-14 13:58:38,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:38,716 INFO L93 Difference]: Finished difference Result 146 states and 215 transitions. [2022-12-14 13:58:38,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 13:58:38,716 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 16 states have internal predecessors, (43), 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 [2022-12-14 13:58:38,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:38,720 INFO L225 Difference]: With dead ends: 146 [2022-12-14 13:58:38,720 INFO L226 Difference]: Without dead ends: 144 [2022-12-14 13:58:38,720 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=157, Invalid=395, Unknown=0, NotChecked=0, Total=552 [2022-12-14 13:58:38,721 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 27 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:38,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 123 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:38,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-12-14 13:58:38,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 96. [2022-12-14 13:58:38,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 74 states have (on average 1.0810810810810811) internal successors, (80), 73 states have internal predecessors, (80), 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) [2022-12-14 13:58:38,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 157 transitions. [2022-12-14 13:58:38,743 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 157 transitions. Word has length 50 [2022-12-14 13:58:38,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:38,743 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 157 transitions. [2022-12-14 13:58:38,743 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 16 states have internal predecessors, (43), 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) [2022-12-14 13:58:38,743 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 157 transitions. [2022-12-14 13:58:38,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 13:58:38,747 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:38,747 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2022-12-14 13:58:38,752 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 13:58:38,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 13:58:38,949 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:38,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:38,950 INFO L85 PathProgramCache]: Analyzing trace with hash -73036163, now seen corresponding path program 1 times [2022-12-14 13:58:38,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:38,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854388423] [2022-12-14 13:58:38,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:38,951 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:38,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:39,164 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 13:58:39,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:39,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854388423] [2022-12-14 13:58:39,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854388423] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:39,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142001165] [2022-12-14 13:58:39,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:39,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:39,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:39,165 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:39,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 13:58:39,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:39,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 13:58:39,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:39,281 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 4 proven. 33 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2022-12-14 13:58:39,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:39,421 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 2 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-12-14 13:58:39,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142001165] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:39,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [32238415] [2022-12-14 13:58:39,423 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:39,423 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:39,423 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:39,424 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:39,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 5] total 18 [2022-12-14 13:58:39,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41923351] [2022-12-14 13:58:39,424 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:39,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 13:58:39,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:39,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 13:58:39,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-12-14 13:58:39,426 INFO L87 Difference]: Start difference. First operand 96 states and 157 transitions. Second operand has 18 states, 18 states have (on average 3.6666666666666665) internal successors, (66), 18 states have internal predecessors, (66), 7 states have call successors, (10), 1 states have call predecessors, (10), 6 states have return successors, (14), 10 states have call predecessors, (14), 7 states have call successors, (14) [2022-12-14 13:58:39,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:39,986 INFO L93 Difference]: Finished difference Result 257 states and 502 transitions. [2022-12-14 13:58:39,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 13:58:39,987 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.6666666666666665) internal successors, (66), 18 states have internal predecessors, (66), 7 states have call successors, (10), 1 states have call predecessors, (10), 6 states have return successors, (14), 10 states have call predecessors, (14), 7 states have call successors, (14) Word has length 67 [2022-12-14 13:58:39,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:39,990 INFO L225 Difference]: With dead ends: 257 [2022-12-14 13:58:39,990 INFO L226 Difference]: Without dead ends: 163 [2022-12-14 13:58:39,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=409, Invalid=1397, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 13:58:39,994 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 149 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:39,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 51 Invalid, 446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:58:39,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-12-14 13:58:40,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 101. [2022-12-14 13:58:40,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 78 states have (on average 1.0512820512820513) internal successors, (82), 78 states have internal predecessors, (82), 12 states have call successors, (12), 3 states have call predecessors, (12), 10 states have return successors, (75), 19 states have call predecessors, (75), 11 states have call successors, (75) [2022-12-14 13:58:40,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 169 transitions. [2022-12-14 13:58:40,026 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 169 transitions. Word has length 67 [2022-12-14 13:58:40,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:40,026 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 169 transitions. [2022-12-14 13:58:40,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.6666666666666665) internal successors, (66), 18 states have internal predecessors, (66), 7 states have call successors, (10), 1 states have call predecessors, (10), 6 states have return successors, (14), 10 states have call predecessors, (14), 7 states have call successors, (14) [2022-12-14 13:58:40,027 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 169 transitions. [2022-12-14 13:58:40,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-12-14 13:58:40,029 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:40,030 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 1, 1, 1] [2022-12-14 13:58:40,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-12-14 13:58:40,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:40,230 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:40,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:40,231 INFO L85 PathProgramCache]: Analyzing trace with hash -985553767, now seen corresponding path program 2 times [2022-12-14 13:58:40,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:40,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058364525] [2022-12-14 13:58:40,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:40,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:40,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:40,336 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 30 proven. 126 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2022-12-14 13:58:40,337 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:40,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058364525] [2022-12-14 13:58:40,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058364525] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:40,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985543732] [2022-12-14 13:58:40,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:58:40,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:40,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:40,338 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:40,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 13:58:40,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 13:58:40,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:40,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 13:58:40,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:40,451 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 192 proven. 20 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2022-12-14 13:58:40,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:40,703 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 192 proven. 22 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-12-14 13:58:40,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985543732] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:40,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [700620685] [2022-12-14 13:58:40,706 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:40,706 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:40,706 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:40,707 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:40,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2022-12-14 13:58:40,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787359786] [2022-12-14 13:58:40,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:40,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 13:58:40,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:40,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 13:58:40,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2022-12-14 13:58:40,709 INFO L87 Difference]: Start difference. First operand 101 states and 169 transitions. Second operand has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 6 states have call successors, (10), 1 states have call predecessors, (10), 6 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2022-12-14 13:58:40,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:40,848 INFO L93 Difference]: Finished difference Result 153 states and 259 transitions. [2022-12-14 13:58:40,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 13:58:40,848 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 6 states have call successors, (10), 1 states have call predecessors, (10), 6 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) Word has length 121 [2022-12-14 13:58:40,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:40,849 INFO L225 Difference]: With dead ends: 153 [2022-12-14 13:58:40,849 INFO L226 Difference]: Without dead ends: 54 [2022-12-14 13:58:40,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 232 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2022-12-14 13:58:40,851 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 63 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:40,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 63 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:40,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-12-14 13:58:40,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-12-14 13:58:40,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 6 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (12), 8 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 13:58:40,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2022-12-14 13:58:40,858 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 121 [2022-12-14 13:58:40,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:40,858 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2022-12-14 13:58:40,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 6 states have call successors, (10), 1 states have call predecessors, (10), 6 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2022-12-14 13:58:40,859 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2022-12-14 13:58:40,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2022-12-14 13:58:40,860 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:40,860 INFO L195 NwaCegarLoop]: trace histogram [18, 15, 15, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 7, 7, 6, 6, 3, 1, 1, 1] [2022-12-14 13:58:40,865 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 13:58:41,061 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:41,062 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:41,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:41,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1806227879, now seen corresponding path program 3 times [2022-12-14 13:58:41,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:41,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546893947] [2022-12-14 13:58:41,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:41,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:41,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:41,387 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 120 proven. 355 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2022-12-14 13:58:41,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:41,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546893947] [2022-12-14 13:58:41,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546893947] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:41,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1372883857] [2022-12-14 13:58:41,387 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:58:41,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:41,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:41,388 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:41,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 13:58:41,443 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:58:41,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:41,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 13:58:41,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:41,539 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 515 proven. 189 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-12-14 13:58:41,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:41,922 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 141 proven. 410 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2022-12-14 13:58:41,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1372883857] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:41,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1639688691] [2022-12-14 13:58:41,924 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:41,924 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:41,924 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:41,925 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:41,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 14] total 19 [2022-12-14 13:58:41,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125403900] [2022-12-14 13:58:41,925 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:41,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 13:58:41,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:41,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 13:58:41,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-12-14 13:58:41,926 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 19 states, 19 states have (on average 5.7894736842105265) internal successors, (110), 19 states have internal predecessors, (110), 14 states have call successors, (20), 3 states have call predecessors, (20), 7 states have return successors, (20), 8 states have call predecessors, (20), 13 states have call successors, (20) [2022-12-14 13:58:42,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:42,146 INFO L93 Difference]: Finished difference Result 121 states and 147 transitions. [2022-12-14 13:58:42,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 13:58:42,147 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 5.7894736842105265) internal successors, (110), 19 states have internal predecessors, (110), 14 states have call successors, (20), 3 states have call predecessors, (20), 7 states have return successors, (20), 8 states have call predecessors, (20), 13 states have call successors, (20) Word has length 163 [2022-12-14 13:58:42,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:42,148 INFO L225 Difference]: With dead ends: 121 [2022-12-14 13:58:42,148 INFO L226 Difference]: Without dead ends: 71 [2022-12-14 13:58:42,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 316 SyntacticMatches, 8 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=252, Invalid=618, Unknown=0, NotChecked=0, Total=870 [2022-12-14 13:58:42,150 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 152 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:42,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 49 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:42,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-12-14 13:58:42,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 60. [2022-12-14 13:58:42,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 46 states have internal predecessors, (51), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2022-12-14 13:58:42,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 69 transitions. [2022-12-14 13:58:42,154 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 69 transitions. Word has length 163 [2022-12-14 13:58:42,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:42,155 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 69 transitions. [2022-12-14 13:58:42,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 5.7894736842105265) internal successors, (110), 19 states have internal predecessors, (110), 14 states have call successors, (20), 3 states have call predecessors, (20), 7 states have return successors, (20), 8 states have call predecessors, (20), 13 states have call successors, (20) [2022-12-14 13:58:42,155 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 69 transitions. [2022-12-14 13:58:42,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-12-14 13:58:42,156 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:42,156 INFO L195 NwaCegarLoop]: trace histogram [20, 18, 16, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 8, 6, 4, 1, 1, 1] [2022-12-14 13:58:42,161 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 13:58:42,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:42,357 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:42,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:42,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1068751191, now seen corresponding path program 4 times [2022-12-14 13:58:42,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:42,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576155535] [2022-12-14 13:58:42,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:42,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:42,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:42,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1193 backedges. 240 proven. 423 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2022-12-14 13:58:42,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:42,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576155535] [2022-12-14 13:58:42,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576155535] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:42,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242365300] [2022-12-14 13:58:42,670 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:58:42,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:42,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:42,671 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:42,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 13:58:42,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:42,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 13:58:42,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:42,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1193 backedges. 269 proven. 486 refuted. 0 times theorem prover too weak. 438 trivial. 0 not checked. [2022-12-14 13:58:42,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:43,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1193 backedges. 269 proven. 525 refuted. 0 times theorem prover too weak. 399 trivial. 0 not checked. [2022-12-14 13:58:43,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242365300] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:43,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [94008770] [2022-12-14 13:58:43,541 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:43,542 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:43,542 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:43,542 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:43,542 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 19] total 24 [2022-12-14 13:58:43,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706452352] [2022-12-14 13:58:43,542 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:43,543 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 13:58:43,543 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:43,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 13:58:43,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2022-12-14 13:58:43,544 INFO L87 Difference]: Start difference. First operand 60 states and 69 transitions. Second operand has 24 states, 24 states have (on average 5.166666666666667) internal successors, (124), 24 states have internal predecessors, (124), 17 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) [2022-12-14 13:58:43,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:43,826 INFO L93 Difference]: Finished difference Result 150 states and 186 transitions. [2022-12-14 13:58:43,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:58:43,826 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.166666666666667) internal successors, (124), 24 states have internal predecessors, (124), 17 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) Word has length 187 [2022-12-14 13:58:43,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:43,827 INFO L225 Difference]: With dead ends: 150 [2022-12-14 13:58:43,827 INFO L226 Difference]: Without dead ends: 94 [2022-12-14 13:58:43,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 361 SyntacticMatches, 9 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=416, Invalid=1144, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 13:58:43,829 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 284 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 241 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 241 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:43,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 75 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [241 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:43,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-12-14 13:58:43,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 81. [2022-12-14 13:58:43,836 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) [2022-12-14 13:58:43,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 96 transitions. [2022-12-14 13:58:43,837 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 96 transitions. Word has length 187 [2022-12-14 13:58:43,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:43,838 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 96 transitions. [2022-12-14 13:58:43,838 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.166666666666667) internal successors, (124), 24 states have internal predecessors, (124), 17 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) [2022-12-14 13:58:43,838 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 96 transitions. [2022-12-14 13:58:43,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-12-14 13:58:43,839 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:43,839 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 1, 1, 1] [2022-12-14 13:58:43,845 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 13:58:44,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:44,041 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:44,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:44,043 INFO L85 PathProgramCache]: Analyzing trace with hash -1578674009, now seen corresponding path program 5 times [2022-12-14 13:58:44,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:44,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999599822] [2022-12-14 13:58:44,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:44,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:44,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:44,233 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 147 proven. 168 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2022-12-14 13:58:44,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:44,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999599822] [2022-12-14 13:58:44,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999599822] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:44,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051798354] [2022-12-14 13:58:44,233 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:58:44,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:44,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:44,234 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:44,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 13:58:44,290 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 13:58:44,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:44,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 13:58:44,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:44,358 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 201 proven. 95 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2022-12-14 13:58:44,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:44,700 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 201 proven. 103 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2022-12-14 13:58:44,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051798354] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:44,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1011386725] [2022-12-14 13:58:44,702 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:44,702 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:44,702 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:44,703 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:44,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 13] total 20 [2022-12-14 13:58:44,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178813835] [2022-12-14 13:58:44,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:44,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 13:58:44,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:44,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 13:58:44,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2022-12-14 13:58:44,705 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) [2022-12-14 13:58:44,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:44,922 INFO L93 Difference]: Finished difference Result 161 states and 201 transitions. [2022-12-14 13:58:44,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 13:58:44,923 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 [2022-12-14 13:58:44,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:44,924 INFO L225 Difference]: With dead ends: 161 [2022-12-14 13:58:44,924 INFO L226 Difference]: Without dead ends: 84 [2022-12-14 13:58:44,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 234 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=228, Invalid=584, Unknown=0, NotChecked=0, Total=812 [2022-12-14 13:58:44,925 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 68 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:44,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 108 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:44,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-12-14 13:58:44,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2022-12-14 13:58:44,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 64 states have (on average 1.046875) internal successors, (67), 63 states have internal predecessors, (67), 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) [2022-12-14 13:58:44,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 95 transitions. [2022-12-14 13:58:44,932 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 95 transitions. Word has length 122 [2022-12-14 13:58:44,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:44,932 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 95 transitions. [2022-12-14 13:58:44,932 INFO L496 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) [2022-12-14 13:58:44,933 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 95 transitions. [2022-12-14 13:58:44,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2022-12-14 13:58:44,934 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:44,934 INFO L195 NwaCegarLoop]: trace histogram [16, 14, 13, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 1, 1, 1] [2022-12-14 13:58:44,939 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 13:58:45,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:45,135 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:45,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:45,135 INFO L85 PathProgramCache]: Analyzing trace with hash 910288603, now seen corresponding path program 6 times [2022-12-14 13:58:45,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:45,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666399585] [2022-12-14 13:58:45,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:45,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:45,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:45,472 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 78 proven. 189 refuted. 0 times theorem prover too weak. 464 trivial. 0 not checked. [2022-12-14 13:58:45,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:45,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666399585] [2022-12-14 13:58:45,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666399585] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:45,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004925991] [2022-12-14 13:58:45,473 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:58:45,473 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:45,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:45,474 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:45,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 13:58:45,546 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:58:45,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:45,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 29 conjunts are in the unsatisfiable core [2022-12-14 13:58:45,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:45,697 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 78 proven. 135 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2022-12-14 13:58:45,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:46,479 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 144 proven. 128 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2022-12-14 13:58:46,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004925991] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:46,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1459988270] [2022-12-14 13:58:46,480 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:46,481 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:46,481 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:46,481 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:46,481 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2022-12-14 13:58:46,481 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214641095] [2022-12-14 13:58:46,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:46,482 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 13:58:46,482 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:46,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 13:58:46,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2022-12-14 13:58:46,482 INFO L87 Difference]: Start difference. First operand 81 states and 95 transitions. Second operand has 32 states, 31 states have (on average 2.6774193548387095) internal successors, (83), 32 states have internal predecessors, (83), 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) [2022-12-14 13:58:46,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:46,625 INFO L93 Difference]: Finished difference Result 114 states and 145 transitions. [2022-12-14 13:58:46,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 13:58:46,625 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.6774193548387095) internal successors, (83), 32 states have internal predecessors, (83), 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 [2022-12-14 13:58:46,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:46,626 INFO L225 Difference]: With dead ends: 114 [2022-12-14 13:58:46,626 INFO L226 Difference]: Without dead ends: 113 [2022-12-14 13:58:46,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 280 SyntacticMatches, 13 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 723 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=293, Invalid=967, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 13:58:46,627 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 20 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:46,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 146 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:46,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-12-14 13:58:46,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 102. [2022-12-14 13:58:46,634 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) [2022-12-14 13:58:46,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 130 transitions. [2022-12-14 13:58:46,635 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 130 transitions. Word has length 148 [2022-12-14 13:58:46,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:46,636 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 130 transitions. [2022-12-14 13:58:46,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.6774193548387095) internal successors, (83), 32 states have internal predecessors, (83), 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) [2022-12-14 13:58:46,636 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 130 transitions. [2022-12-14 13:58:46,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 458 [2022-12-14 13:58:46,644 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:46,644 INFO L195 NwaCegarLoop]: trace histogram [48, 45, 39, 24, 24, 24, 24, 23, 23, 23, 23, 23, 22, 22, 22, 21, 15, 9, 1, 1, 1] [2022-12-14 13:58:46,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 13:58:46,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 13:58:46,846 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:46,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:46,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1547500908, now seen corresponding path program 7 times [2022-12-14 13:58:46,848 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:46,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128006328] [2022-12-14 13:58:46,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:46,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:46,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:47,533 INFO L134 CoverageAnalysis]: Checked inductivity of 7510 backedges. 596 proven. 2001 refuted. 0 times theorem prover too weak. 4913 trivial. 0 not checked. [2022-12-14 13:58:47,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:47,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128006328] [2022-12-14 13:58:47,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128006328] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:47,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557713400] [2022-12-14 13:58:47,534 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:58:47,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:47,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:47,535 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:47,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 13:58:47,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:47,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 870 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 13:58:47,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:47,807 INFO L134 CoverageAnalysis]: Checked inductivity of 7510 backedges. 3970 proven. 1245 refuted. 0 times theorem prover too weak. 2295 trivial. 0 not checked. [2022-12-14 13:58:47,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:48,852 INFO L134 CoverageAnalysis]: Checked inductivity of 7510 backedges. 706 proven. 2493 refuted. 0 times theorem prover too weak. 4311 trivial. 0 not checked. [2022-12-14 13:58:48,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557713400] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:48,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1875756234] [2022-12-14 13:58:48,859 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:48,860 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:48,860 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:48,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:48,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 22] total 27 [2022-12-14 13:58:48,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51955928] [2022-12-14 13:58:48,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:48,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 13:58:48,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:48,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 13:58:48,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2022-12-14 13:58:48,864 INFO L87 Difference]: Start difference. First operand 102 states and 130 transitions. Second operand has 27 states, 27 states have (on average 5.962962962962963) internal successors, (161), 27 states have internal predecessors, (161), 22 states have call successors, (29), 3 states have call predecessors, (29), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2022-12-14 13:58:49,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:49,324 INFO L93 Difference]: Finished difference Result 243 states and 332 transitions. [2022-12-14 13:58:49,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 13:58:49,324 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 5.962962962962963) internal successors, (161), 27 states have internal predecessors, (161), 22 states have call successors, (29), 3 states have call predecessors, (29), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) Word has length 457 [2022-12-14 13:58:49,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:49,326 INFO L225 Difference]: With dead ends: 243 [2022-12-14 13:58:49,326 INFO L226 Difference]: Without dead ends: 145 [2022-12-14 13:58:49,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 957 GetRequests, 899 SyntacticMatches, 12 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=589, Invalid=1667, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 13:58:49,327 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 231 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:49,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 105 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:58:49,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-12-14 13:58:49,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 129. [2022-12-14 13:58:49,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 104 states have (on average 1.0480769230769231) internal successors, (109), 100 states have internal predecessors, (109), 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) [2022-12-14 13:58:49,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 161 transitions. [2022-12-14 13:58:49,337 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 161 transitions. Word has length 457 [2022-12-14 13:58:49,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:49,337 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 161 transitions. [2022-12-14 13:58:49,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 5.962962962962963) internal successors, (161), 27 states have internal predecessors, (161), 22 states have call successors, (29), 3 states have call predecessors, (29), 11 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2022-12-14 13:58:49,338 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 161 transitions. [2022-12-14 13:58:49,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2022-12-14 13:58:49,342 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:49,342 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 25, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 10, 6, 1, 1, 1] [2022-12-14 13:58:49,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-12-14 13:58:49,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 13:58:49,544 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:49,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:49,545 INFO L85 PathProgramCache]: Analyzing trace with hash -1802505882, now seen corresponding path program 8 times [2022-12-14 13:58:49,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:49,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123599367] [2022-12-14 13:58:49,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:49,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:49,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:49,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 522 proven. 990 refuted. 0 times theorem prover too weak. 1638 trivial. 0 not checked. [2022-12-14 13:58:49,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:49,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123599367] [2022-12-14 13:58:49,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123599367] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:49,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627107513] [2022-12-14 13:58:49,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:58:49,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:49,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:49,915 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:49,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 13:58:50,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-12-14 13:58:50,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:50,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 13:58:50,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:50,156 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 785 proven. 527 refuted. 0 times theorem prover too weak. 1838 trivial. 0 not checked. [2022-12-14 13:58:50,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:50,803 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 793 proven. 552 refuted. 0 times theorem prover too weak. 1805 trivial. 0 not checked. [2022-12-14 13:58:50,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627107513] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:50,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1331658382] [2022-12-14 13:58:50,804 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:50,804 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:50,804 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:50,804 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:50,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 17] total 27 [2022-12-14 13:58:50,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946565465] [2022-12-14 13:58:50,805 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:50,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 13:58:50,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:50,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 13:58:50,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=571, Unknown=0, NotChecked=0, Total=702 [2022-12-14 13:58:50,806 INFO L87 Difference]: Start difference. First operand 129 states and 161 transitions. Second operand has 27 states, 27 states have (on average 5.592592592592593) internal successors, (151), 27 states have internal predecessors, (151), 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) [2022-12-14 13:58:51,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:51,202 INFO L93 Difference]: Finished difference Result 256 states and 344 transitions. [2022-12-14 13:58:51,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 13:58:51,202 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 5.592592592592593) internal successors, (151), 27 states have internal predecessors, (151), 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 [2022-12-14 13:58:51,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:51,203 INFO L225 Difference]: With dead ends: 256 [2022-12-14 13:58:51,203 INFO L226 Difference]: Without dead ends: 131 [2022-12-14 13:58:51,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 631 GetRequests, 583 SyntacticMatches, 8 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=427, Invalid=1295, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 13:58:51,205 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 113 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:51,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 189 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:58:51,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-12-14 13:58:51,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 111. [2022-12-14 13:58:51,209 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) [2022-12-14 13:58:51,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 134 transitions. [2022-12-14 13:58:51,210 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 134 transitions. Word has length 299 [2022-12-14 13:58:51,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:51,211 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 134 transitions. [2022-12-14 13:58:51,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 5.592592592592593) internal successors, (151), 27 states have internal predecessors, (151), 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) [2022-12-14 13:58:51,211 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 134 transitions. [2022-12-14 13:58:51,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 770 [2022-12-14 13:58:51,215 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:51,215 INFO L195 NwaCegarLoop]: trace histogram [81, 75, 66, 42, 42, 42, 42, 38, 38, 38, 38, 38, 37, 37, 37, 36, 24, 15, 1, 1, 1] [2022-12-14 13:58:51,221 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 13:58:51,416 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:51,416 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:51,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:51,417 INFO L85 PathProgramCache]: Analyzing trace with hash -768652980, now seen corresponding path program 9 times [2022-12-14 13:58:51,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:51,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930348735] [2022-12-14 13:58:51,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:51,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:51,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:52,542 INFO L134 CoverageAnalysis]: Checked inductivity of 21568 backedges. 1073 proven. 4520 refuted. 0 times theorem prover too weak. 15975 trivial. 0 not checked. [2022-12-14 13:58:52,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:52,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930348735] [2022-12-14 13:58:52,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930348735] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:52,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522008511] [2022-12-14 13:58:52,543 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:58:52,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:52,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:52,544 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:52,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 13:58:52,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:58:52,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:52,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:58:52,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:52,856 INFO L134 CoverageAnalysis]: Checked inductivity of 21568 backedges. 10614 proven. 2739 refuted. 0 times theorem prover too weak. 8215 trivial. 0 not checked. [2022-12-14 13:58:52,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:54,114 INFO L134 CoverageAnalysis]: Checked inductivity of 21568 backedges. 1286 proven. 4920 refuted. 0 times theorem prover too weak. 15362 trivial. 0 not checked. [2022-12-14 13:58:54,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522008511] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:54,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [427476745] [2022-12-14 13:58:54,116 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:58:54,116 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:54,116 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:58:54,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:54,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 23] total 28 [2022-12-14 13:58:54,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640336458] [2022-12-14 13:58:54,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:54,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 13:58:54,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:54,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 13:58:54,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=633, Unknown=0, NotChecked=0, Total=756 [2022-12-14 13:58:54,118 INFO L87 Difference]: Start difference. First operand 111 states and 134 transitions. Second operand has 28 states, 28 states have (on average 5.75) internal successors, (161), 28 states have internal predecessors, (161), 23 states have call successors, (29), 6 states have call predecessors, (29), 10 states have return successors, (29), 11 states have call predecessors, (29), 19 states have call successors, (29) [2022-12-14 13:58:54,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:54,503 INFO L93 Difference]: Finished difference Result 263 states and 342 transitions. [2022-12-14 13:58:54,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 13:58:54,504 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.75) internal successors, (161), 28 states have internal predecessors, (161), 23 states have call successors, (29), 6 states have call predecessors, (29), 10 states have return successors, (29), 11 states have call predecessors, (29), 19 states have call successors, (29) Word has length 769 [2022-12-14 13:58:54,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:54,506 INFO L225 Difference]: With dead ends: 263 [2022-12-14 13:58:54,506 INFO L226 Difference]: Without dead ends: 156 [2022-12-14 13:58:54,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1588 GetRequests, 1522 SyntacticMatches, 17 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=699, Invalid=1851, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 13:58:54,507 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 373 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 225 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 225 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:54,507 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [373 Valid, 79 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [225 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:54,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-12-14 13:58:54,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 123. [2022-12-14 13:58:54,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 98 states have (on average 1.030612244897959) internal successors, (101), 97 states have internal predecessors, (101), 16 states have call successors, (16), 12 states have call predecessors, (16), 8 states have return successors, (35), 13 states have call predecessors, (35), 15 states have call successors, (35) [2022-12-14 13:58:54,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 152 transitions. [2022-12-14 13:58:54,513 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 152 transitions. Word has length 769 [2022-12-14 13:58:54,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:54,514 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 152 transitions. [2022-12-14 13:58:54,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.75) internal successors, (161), 28 states have internal predecessors, (161), 23 states have call successors, (29), 6 states have call predecessors, (29), 10 states have return successors, (29), 11 states have call predecessors, (29), 19 states have call successors, (29) [2022-12-14 13:58:54,514 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 152 transitions. [2022-12-14 13:58:54,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2022-12-14 13:58:54,516 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:54,516 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 33, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 13, 8, 1, 1, 1] [2022-12-14 13:58:54,522 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 13:58:54,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 13:58:54,718 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:58:54,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:54,719 INFO L85 PathProgramCache]: Analyzing trace with hash -1717605333, now seen corresponding path program 10 times [2022-12-14 13:58:54,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:54,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044998471] [2022-12-14 13:58:54,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:54,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:54,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:56,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5628 backedges. 830 proven. 1470 refuted. 0 times theorem prover too weak. 3328 trivial. 0 not checked. [2022-12-14 13:58:56,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:56,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044998471] [2022-12-14 13:58:56,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044998471] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:56,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531208618] [2022-12-14 13:58:56,534 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:58:56,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:56,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:56,535 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:56,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 13:58:56,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:56,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 81 conjunts are in the unsatisfiable core [2022-12-14 13:58:56,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:56,988 INFO L134 CoverageAnalysis]: Checked inductivity of 5628 backedges. 820 proven. 1112 refuted. 0 times theorem prover too weak. 3696 trivial. 0 not checked. [2022-12-14 13:58:56,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:01,464 INFO L134 CoverageAnalysis]: Checked inductivity of 5628 backedges. 1149 proven. 1015 refuted. 0 times theorem prover too weak. 3464 trivial. 0 not checked. [2022-12-14 13:59:01,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531208618] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:01,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [898643283] [2022-12-14 13:59:01,466 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:59:01,466 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:01,467 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:59:01,467 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:01,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2022-12-14 13:59:01,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997409060] [2022-12-14 13:59:01,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:01,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 13:59:01,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:01,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 13:59:01,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 13:59:01,470 INFO L87 Difference]: Start difference. First operand 123 states and 152 transitions. Second operand has 46 states, 45 states have (on average 2.6) internal successors, (117), 46 states have internal predecessors, (117), 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) [2022-12-14 13:59:01,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:01,617 INFO L93 Difference]: Finished difference Result 156 states and 206 transitions. [2022-12-14 13:59:01,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 13:59:01,618 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.6) internal successors, (117), 46 states have internal predecessors, (117), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) Word has length 397 [2022-12-14 13:59:01,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:01,619 INFO L225 Difference]: With dead ends: 156 [2022-12-14 13:59:01,619 INFO L226 Difference]: Without dead ends: 155 [2022-12-14 13:59:01,620 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 877 GetRequests, 778 SyntacticMatches, 51 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2454 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 13:59:01,620 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 11 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:01,620 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 185 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:59:01,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-12-14 13:59:01,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 144. [2022-12-14 13:59:01,626 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) [2022-12-14 13:59:01,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 191 transitions. [2022-12-14 13:59:01,626 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 191 transitions. Word has length 397 [2022-12-14 13:59:01,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:01,627 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 191 transitions. [2022-12-14 13:59:01,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.6) internal successors, (117), 46 states have internal predecessors, (117), 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) [2022-12-14 13:59:01,627 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 191 transitions. [2022-12-14 13:59:01,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1223 [2022-12-14 13:59:01,637 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:01,637 INFO L195 NwaCegarLoop]: trace histogram [126, 123, 102, 63, 63, 63, 63, 62, 62, 62, 62, 62, 61, 61, 61, 60, 39, 24, 1, 1, 1] [2022-12-14 13:59:01,642 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 13:59:01,838 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 13:59:01,838 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:59:01,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:01,839 INFO L85 PathProgramCache]: Analyzing trace with hash 326218233, now seen corresponding path program 11 times [2022-12-14 13:59:01,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:01,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490386903] [2022-12-14 13:59:01,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:01,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:01,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:03,900 INFO L134 CoverageAnalysis]: Checked inductivity of 54820 backedges. 2434 proven. 9103 refuted. 0 times theorem prover too weak. 43283 trivial. 0 not checked. [2022-12-14 13:59:03,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:03,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490386903] [2022-12-14 13:59:03,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490386903] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:03,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432638431] [2022-12-14 13:59:03,901 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:59:03,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:03,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:03,902 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:03,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 13:59:04,326 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2022-12-14 13:59:04,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:04,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 1565 conjuncts, 165 conjunts are in the unsatisfiable core [2022-12-14 13:59:04,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:05,073 INFO L134 CoverageAnalysis]: Checked inductivity of 54820 backedges. 16360 proven. 4596 refuted. 0 times theorem prover too weak. 33864 trivial. 0 not checked. [2022-12-14 13:59:05,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:21,921 INFO L134 CoverageAnalysis]: Checked inductivity of 54820 backedges. 17227 proven. 4261 refuted. 0 times theorem prover too weak. 33332 trivial. 0 not checked. [2022-12-14 13:59:21,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432638431] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:21,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1443855684] [2022-12-14 13:59:21,924 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:59:21,924 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:21,924 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:59:21,924 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:21,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 38] total 65 [2022-12-14 13:59:21,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564812735] [2022-12-14 13:59:21,926 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:21,929 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-12-14 13:59:21,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:21,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-12-14 13:59:21,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=3617, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 13:59:21,933 INFO L87 Difference]: Start difference. First operand 144 states and 191 transitions. Second operand has 65 states, 65 states have (on average 3.5076923076923077) internal successors, (228), 65 states have internal predecessors, (228), 27 states have call successors, (31), 2 states have call predecessors, (31), 25 states have return successors, (57), 47 states have call predecessors, (57), 26 states have call successors, (57) [2022-12-14 13:59:23,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:23,874 INFO L93 Difference]: Finished difference Result 408 states and 620 transitions. [2022-12-14 13:59:23,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-12-14 13:59:23,875 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.5076923076923077) internal successors, (228), 65 states have internal predecessors, (228), 27 states have call successors, (31), 2 states have call predecessors, (31), 25 states have return successors, (57), 47 states have call predecessors, (57), 26 states have call successors, (57) Word has length 1222 [2022-12-14 13:59:23,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:23,877 INFO L225 Difference]: With dead ends: 408 [2022-12-14 13:59:23,877 INFO L226 Difference]: Without dead ends: 268 [2022-12-14 13:59:23,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2547 GetRequests, 2304 SyntacticMatches, 109 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9306 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2510, Invalid=15850, Unknown=0, NotChecked=0, Total=18360 [2022-12-14 13:59:23,882 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 439 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 1472 mSolverCounterSat, 383 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 1855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 383 IncrementalHoareTripleChecker+Valid, 1472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:23,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [439 Valid, 119 Invalid, 1855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [383 Valid, 1472 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 13:59:23,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-12-14 13:59:23,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 219. [2022-12-14 13:59:23,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 176 states have (on average 1.0284090909090908) internal successors, (181), 172 states have internal predecessors, (181), 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) [2022-12-14 13:59:23,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 316 transitions. [2022-12-14 13:59:23,892 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 316 transitions. Word has length 1222 [2022-12-14 13:59:23,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:23,892 INFO L495 AbstractCegarLoop]: Abstraction has 219 states and 316 transitions. [2022-12-14 13:59:23,893 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.5076923076923077) internal successors, (228), 65 states have internal predecessors, (228), 27 states have call successors, (31), 2 states have call predecessors, (31), 25 states have return successors, (57), 47 states have call predecessors, (57), 26 states have call successors, (57) [2022-12-14 13:59:23,893 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 316 transitions. [2022-12-14 13:59:23,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1228 [2022-12-14 13:59:23,912 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:23,912 INFO L195 NwaCegarLoop]: trace histogram [126, 124, 102, 63, 63, 63, 63, 62, 62, 62, 62, 62, 62, 62, 62, 61, 39, 24, 1, 1, 1] [2022-12-14 13:59:23,920 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 13:59:24,113 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 13:59:24,113 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:59:24,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:24,115 INFO L85 PathProgramCache]: Analyzing trace with hash -401112260, now seen corresponding path program 12 times [2022-12-14 13:59:24,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:24,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462595872] [2022-12-14 13:59:24,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:24,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:24,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:25,999 INFO L134 CoverageAnalysis]: Checked inductivity of 55249 backedges. 7058 proven. 3863 refuted. 0 times theorem prover too weak. 44328 trivial. 0 not checked. [2022-12-14 13:59:25,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:25,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462595872] [2022-12-14 13:59:26,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462595872] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:26,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453771978] [2022-12-14 13:59:26,000 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:59:26,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:26,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:26,001 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:26,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 13:59:26,339 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:59:26,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:26,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 1523 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:59:26,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:26,514 INFO L134 CoverageAnalysis]: Checked inductivity of 55249 backedges. 29751 proven. 2667 refuted. 0 times theorem prover too weak. 22831 trivial. 0 not checked. [2022-12-14 13:59:26,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:30,026 INFO L134 CoverageAnalysis]: Checked inductivity of 55249 backedges. 3367 proven. 9723 refuted. 0 times theorem prover too weak. 42159 trivial. 0 not checked. [2022-12-14 13:59:30,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453771978] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:30,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1520049072] [2022-12-14 13:59:30,028 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:59:30,028 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:30,028 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:59:30,028 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:30,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 27] total 35 [2022-12-14 13:59:30,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304970724] [2022-12-14 13:59:30,028 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:30,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 13:59:30,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:30,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 13:59:30,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=980, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 13:59:30,032 INFO L87 Difference]: Start difference. First operand 219 states and 316 transitions. Second operand has 35 states, 35 states have (on average 5.828571428571428) internal successors, (204), 35 states have internal predecessors, (204), 29 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (50), 19 states have call predecessors, (50), 29 states have call successors, (50) [2022-12-14 13:59:30,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:30,650 INFO L93 Difference]: Finished difference Result 419 states and 639 transitions. [2022-12-14 13:59:30,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 13:59:30,650 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 5.828571428571428) internal successors, (204), 35 states have internal predecessors, (204), 29 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (50), 19 states have call predecessors, (50), 29 states have call successors, (50) Word has length 1227 [2022-12-14 13:59:30,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:30,652 INFO L225 Difference]: With dead ends: 419 [2022-12-14 13:59:30,652 INFO L226 Difference]: Without dead ends: 204 [2022-12-14 13:59:30,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2501 GetRequests, 2434 SyntacticMatches, 13 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 932 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=760, Invalid=2320, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 13:59:30,654 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 310 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 472 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 1320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 472 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:30,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [310 Valid, 269 Invalid, 1320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [472 Valid, 848 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 13:59:30,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2022-12-14 13:59:30,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 162. [2022-12-14 13:59:30,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 130 states have (on average 1.023076923076923) internal successors, (133), 128 states have internal predecessors, (133), 21 states have call successors, (21), 15 states have call predecessors, (21), 10 states have return successors, (57), 18 states have call predecessors, (57), 20 states have call successors, (57) [2022-12-14 13:59:30,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 211 transitions. [2022-12-14 13:59:30,662 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 211 transitions. Word has length 1227 [2022-12-14 13:59:30,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:30,662 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 211 transitions. [2022-12-14 13:59:30,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 5.828571428571428) internal successors, (204), 35 states have internal predecessors, (204), 29 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (50), 19 states have call predecessors, (50), 29 states have call successors, (50) [2022-12-14 13:59:30,663 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 211 transitions. [2022-12-14 13:59:30,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2000 [2022-12-14 13:59:30,694 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:30,695 INFO L195 NwaCegarLoop]: trace histogram [206, 201, 167, 104, 104, 104, 104, 101, 101, 101, 101, 101, 100, 100, 100, 99, 63, 39, 1, 1, 1] [2022-12-14 13:59:30,703 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 13:59:30,896 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:30,896 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:59:30,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:30,897 INFO L85 PathProgramCache]: Analyzing trace with hash -833813764, now seen corresponding path program 13 times [2022-12-14 13:59:30,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:30,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404326180] [2022-12-14 13:59:30,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:30,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:31,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:36,543 INFO L134 CoverageAnalysis]: Checked inductivity of 147409 backedges. 4311 proven. 16900 refuted. 0 times theorem prover too weak. 126198 trivial. 0 not checked. [2022-12-14 13:59:36,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:36,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404326180] [2022-12-14 13:59:36,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404326180] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:36,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380421566] [2022-12-14 13:59:36,544 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:59:36,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:36,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:36,545 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:36,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 13:59:37,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:37,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 3716 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 13:59:37,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:37,298 INFO L134 CoverageAnalysis]: Checked inductivity of 147409 backedges. 70214 proven. 10760 refuted. 0 times theorem prover too weak. 66435 trivial. 0 not checked. [2022-12-14 13:59:37,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:40,313 INFO L134 CoverageAnalysis]: Checked inductivity of 147409 backedges. 5222 proven. 19313 refuted. 0 times theorem prover too weak. 122874 trivial. 0 not checked. [2022-12-14 13:59:40,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380421566] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:40,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [333347427] [2022-12-14 13:59:40,315 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 13:59:40,315 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:40,315 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 13:59:40,315 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:40,316 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 32] total 37 [2022-12-14 13:59:40,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316366916] [2022-12-14 13:59:40,316 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:40,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 13:59:40,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:40,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 13:59:40,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1132, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 13:59:40,318 INFO L87 Difference]: Start difference. First operand 162 states and 211 transitions. Second operand has 37 states, 37 states have (on average 5.918918918918919) internal successors, (219), 37 states have internal predecessors, (219), 32 states have call successors, (39), 5 states have call predecessors, (39), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2022-12-14 13:59:41,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:41,105 INFO L93 Difference]: Finished difference Result 392 states and 545 transitions. [2022-12-14 13:59:41,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 13:59:41,106 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 5.918918918918919) internal successors, (219), 37 states have internal predecessors, (219), 32 states have call successors, (39), 5 states have call predecessors, (39), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) Word has length 1999 [2022-12-14 13:59:41,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:41,109 INFO L225 Difference]: With dead ends: 392 [2022-12-14 13:59:41,110 INFO L226 Difference]: Without dead ends: 234 [2022-12-14 13:59:41,112 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4073 GetRequests, 3976 SyntacticMatches, 20 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1627 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1530, Invalid=4632, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 13:59:41,113 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 515 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 425 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 515 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 873 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 425 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:41,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [515 Valid, 135 Invalid, 873 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [425 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:59:41,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2022-12-14 13:59:41,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 168. [2022-12-14 13:59:41,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 135 states have (on average 1.0222222222222221) internal successors, (138), 133 states have internal predecessors, (138), 22 states have call successors, (22), 16 states have call predecessors, (22), 10 states have return successors, (56), 18 states have call predecessors, (56), 21 states have call successors, (56) [2022-12-14 13:59:41,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 216 transitions. [2022-12-14 13:59:41,120 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 216 transitions. Word has length 1999 [2022-12-14 13:59:41,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:41,121 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 216 transitions. [2022-12-14 13:59:41,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 5.918918918918919) internal successors, (219), 37 states have internal predecessors, (219), 32 states have call successors, (39), 5 states have call predecessors, (39), 15 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2022-12-14 13:59:41,121 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 216 transitions. [2022-12-14 13:59:41,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2575 [2022-12-14 13:59:41,155 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:41,155 INFO L195 NwaCegarLoop]: trace histogram [265, 259, 215, 134, 134, 134, 134, 130, 130, 130, 130, 130, 129, 129, 129, 128, 81, 50, 1, 1, 1] [2022-12-14 13:59:41,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 13:59:41,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:41,357 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 13:59:41,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:41,359 INFO L85 PathProgramCache]: Analyzing trace with hash 2015668046, now seen corresponding path program 14 times [2022-12-14 13:59:41,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:41,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285983053] [2022-12-14 13:59:41,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:41,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:41,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:53,349 INFO L134 CoverageAnalysis]: Checked inductivity of 244828 backedges. 7660 proven. 23173 refuted. 0 times theorem prover too weak. 213995 trivial. 0 not checked. [2022-12-14 13:59:53,349 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:53,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285983053] [2022-12-14 13:59:53,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285983053] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:53,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180666174] [2022-12-14 13:59:53,350 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:59:53,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:53,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:53,351 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:53,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 13:59:54,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 122 check-sat command(s) [2022-12-14 13:59:54,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:54,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 2904 conjuncts, 301 conjunts are in the unsatisfiable core [2022-12-14 13:59:54,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:55,935 INFO L134 CoverageAnalysis]: Checked inductivity of 244828 backedges. 74566 proven. 14975 refuted. 0 times theorem prover too weak. 155287 trivial. 0 not checked. [2022-12-14 13:59:55,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:01:08,115 INFO L134 CoverageAnalysis]: Checked inductivity of 244828 backedges. 76281 proven. 14274 refuted. 0 times theorem prover too weak. 154273 trivial. 0 not checked. [2022-12-14 14:01:08,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180666174] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:01:08,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1730008910] [2022-12-14 14:01:08,118 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 14:01:08,118 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:01:08,119 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 14:01:08,119 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:01:08,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 27, 44] total 81 [2022-12-14 14:01:08,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398962091] [2022-12-14 14:01:08,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:01:08,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-12-14 14:01:08,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:01:08,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-12-14 14:01:08,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=829, Invalid=5651, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 14:01:08,124 INFO L87 Difference]: Start difference. First operand 168 states and 216 transitions. Second operand has 81 states, 81 states have (on average 3.432098765432099) internal successors, (278), 81 states have internal predecessors, (278), 35 states have call successors, (39), 5 states have call predecessors, (39), 30 states have return successors, (67), 56 states have call predecessors, (67), 31 states have call successors, (67) [2022-12-14 14:01:10,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:01:10,302 INFO L93 Difference]: Finished difference Result 477 states and 724 transitions. [2022-12-14 14:01:10,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-12-14 14:01:10,303 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 3.432098765432099) internal successors, (278), 81 states have internal predecessors, (278), 35 states have call successors, (39), 5 states have call predecessors, (39), 30 states have return successors, (67), 56 states have call predecessors, (67), 31 states have call successors, (67) Word has length 2574 [2022-12-14 14:01:10,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:01:10,308 INFO L225 Difference]: With dead ends: 477 [2022-12-14 14:01:10,308 INFO L226 Difference]: Without dead ends: 313 [2022-12-14 14:01:10,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5267 GetRequests, 4903 SyntacticMatches, 207 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16717 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3570, Invalid=21552, Unknown=0, NotChecked=0, Total=25122 [2022-12-14 14:01:10,311 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 820 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 1896 mSolverCounterSat, 432 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 820 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 2328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 432 IncrementalHoareTripleChecker+Valid, 1896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 14:01:10,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [820 Valid, 143 Invalid, 2328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [432 Valid, 1896 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 14:01:10,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2022-12-14 14:01:10,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 273. [2022-12-14 14:01:10,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 220 states have (on average 1.0227272727272727) internal successors, (225), 216 states have internal predecessors, (225), 35 states have call successors, (35), 23 states have call predecessors, (35), 17 states have return successors, (147), 33 states have call predecessors, (147), 34 states have call successors, (147) [2022-12-14 14:01:10,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 407 transitions. [2022-12-14 14:01:10,325 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 407 transitions. Word has length 2574 [2022-12-14 14:01:10,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:01:10,326 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 407 transitions. [2022-12-14 14:01:10,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 3.432098765432099) internal successors, (278), 81 states have internal predecessors, (278), 35 states have call successors, (39), 5 states have call predecessors, (39), 30 states have return successors, (67), 56 states have call predecessors, (67), 31 states have call successors, (67) [2022-12-14 14:01:10,326 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 407 transitions. [2022-12-14 14:01:10,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2968 [2022-12-14 14:01:10,371 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:10,371 INFO L195 NwaCegarLoop]: trace histogram [303, 302, 245, 151, 151, 151, 151, 151, 151, 151, 151, 151, 151, 151, 151, 150, 94, 58, 1, 1, 1] [2022-12-14 14:01:10,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 14:01:10,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:10,572 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 14:01:10,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:01:10,574 INFO L85 PathProgramCache]: Analyzing trace with hash -933135272, now seen corresponding path program 15 times [2022-12-14 14:01:10,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:01:10,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653115598] [2022-12-14 14:01:10,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:10,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:01:11,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:25,214 INFO L134 CoverageAnalysis]: Checked inductivity of 325548 backedges. 15455 proven. 28475 refuted. 0 times theorem prover too weak. 281618 trivial. 0 not checked. [2022-12-14 14:01:25,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:01:25,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653115598] [2022-12-14 14:01:25,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653115598] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:01:25,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063194488] [2022-12-14 14:01:25,214 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:01:25,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:25,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:01:25,215 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:01:25,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 14:01:26,278 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:01:26,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:01:26,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 3672 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 14:01:26,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:01:26,534 INFO L134 CoverageAnalysis]: Checked inductivity of 325548 backedges. 170845 proven. 10882 refuted. 0 times theorem prover too weak. 143821 trivial. 0 not checked. [2022-12-14 14:01:26,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:01:34,062 INFO L134 CoverageAnalysis]: Checked inductivity of 325548 backedges. 10950 proven. 32462 refuted. 0 times theorem prover too weak. 282136 trivial. 0 not checked. [2022-12-14 14:01:34,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063194488] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:01:34,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1696903796] [2022-12-14 14:01:34,064 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 14:01:34,064 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:01:34,064 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 14:01:34,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:01:34,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 35] total 39 [2022-12-14 14:01:34,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907643704] [2022-12-14 14:01:34,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:01:34,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 14:01:34,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:01:34,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 14:01:34,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1228, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 14:01:34,069 INFO L87 Difference]: Start difference. First operand 273 states and 407 transitions. Second operand has 39 states, 39 states have (on average 6.153846153846154) internal successors, (240), 39 states have internal predecessors, (240), 36 states have call successors, (41), 2 states have call predecessors, (41), 19 states have return successors, (56), 20 states have call predecessors, (56), 36 states have call successors, (56) [2022-12-14 14:01:34,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:01:34,709 INFO L93 Difference]: Finished difference Result 533 states and 834 transitions. [2022-12-14 14:01:34,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 14:01:34,710 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 6.153846153846154) internal successors, (240), 39 states have internal predecessors, (240), 36 states have call successors, (41), 2 states have call predecessors, (41), 19 states have return successors, (56), 20 states have call predecessors, (56), 36 states have call successors, (56) Word has length 2967 [2022-12-14 14:01:34,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:01:34,714 INFO L225 Difference]: With dead ends: 533 [2022-12-14 14:01:34,714 INFO L226 Difference]: Without dead ends: 264 [2022-12-14 14:01:34,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5995 GetRequests, 5916 SyntacticMatches, 17 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1037 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=983, Invalid=3049, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 14:01:34,717 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 525 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 1088 mSolverCounterSat, 738 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 1826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 738 IncrementalHoareTripleChecker+Valid, 1088 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:01:34,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [525 Valid, 324 Invalid, 1826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [738 Valid, 1088 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 14:01:34,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-12-14 14:01:34,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 204. [2022-12-14 14:01:34,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 162 states have internal predecessors, (167), 27 states have call successors, (27), 19 states have call predecessors, (27), 12 states have return successors, (82), 22 states have call predecessors, (82), 26 states have call successors, (82) [2022-12-14 14:01:34,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 276 transitions. [2022-12-14 14:01:34,734 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 276 transitions. Word has length 2967 [2022-12-14 14:01:34,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:01:34,735 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 276 transitions. [2022-12-14 14:01:34,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 6.153846153846154) internal successors, (240), 39 states have internal predecessors, (240), 36 states have call successors, (41), 2 states have call predecessors, (41), 19 states have return successors, (56), 20 states have call predecessors, (56), 36 states have call successors, (56) [2022-12-14 14:01:34,736 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 276 transitions. [2022-12-14 14:01:34,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5249 [2022-12-14 14:01:34,922 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:34,922 INFO L195 NwaCegarLoop]: trace histogram [538, 531, 436, 271, 271, 271, 271, 266, 266, 266, 266, 266, 265, 265, 265, 264, 165, 102, 1, 1, 1] [2022-12-14 14:01:34,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-12-14 14:01:35,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 14:01:35,123 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 14:01:35,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:01:35,124 INFO L85 PathProgramCache]: Analyzing trace with hash -355803195, now seen corresponding path program 16 times [2022-12-14 14:01:35,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:01:35,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51875013] [2022-12-14 14:01:35,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:35,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:01:35,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:23,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1020841 backedges. 12940 proven. 55983 refuted. 0 times theorem prover too weak. 951918 trivial. 0 not checked. [2022-12-14 14:02:23,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:23,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51875013] [2022-12-14 14:02:23,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51875013] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:23,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1881996072] [2022-12-14 14:02:23,653 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:02:23,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:23,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:23,654 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:23,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 14:02:25,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:25,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 9715 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 14:02:25,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:25,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1020841 backedges. 467353 proven. 36207 refuted. 0 times theorem prover too weak. 517281 trivial. 0 not checked. [2022-12-14 14:02:25,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:32,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1020841 backedges. 15528 proven. 62569 refuted. 0 times theorem prover too weak. 942744 trivial. 0 not checked. [2022-12-14 14:02:32,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1881996072] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:32,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1026896200] [2022-12-14 14:02:32,224 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 14:02:32,225 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:32,225 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 14:02:32,225 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:32,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 37] total 42 [2022-12-14 14:02:32,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266135957] [2022-12-14 14:02:32,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:32,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 14:02:32,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:32,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 14:02:32,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1472, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 14:02:32,230 INFO L87 Difference]: Start difference. First operand 204 states and 276 transitions. Second operand has 42 states, 42 states have (on average 5.857142857142857) internal successors, (246), 42 states have internal predecessors, (246), 37 states have call successors, (44), 8 states have call predecessors, (44), 16 states have return successors, (49), 18 states have call predecessors, (49), 31 states have call successors, (49) [2022-12-14 14:02:33,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:33,036 INFO L93 Difference]: Finished difference Result 479 states and 700 transitions. [2022-12-14 14:02:33,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 14:02:33,037 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.857142857142857) internal successors, (246), 42 states have internal predecessors, (246), 37 states have call successors, (44), 8 states have call predecessors, (44), 16 states have return successors, (49), 18 states have call predecessors, (49), 31 states have call successors, (49) Word has length 5248 [2022-12-14 14:02:33,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:33,040 INFO L225 Difference]: With dead ends: 479 [2022-12-14 14:02:33,040 INFO L226 Difference]: Without dead ends: 279 [2022-12-14 14:02:33,042 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10583 GetRequests, 10470 SyntacticMatches, 27 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2125 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1954, Invalid=5702, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 14:02:33,042 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 578 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 430 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 578 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 938 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 430 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:33,043 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [578 Valid, 163 Invalid, 938 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [430 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 14:02:33,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2022-12-14 14:02:33,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 210. [2022-12-14 14:02:33,056 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) [2022-12-14 14:02:33,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 281 transitions. [2022-12-14 14:02:33,057 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 281 transitions. Word has length 5248 [2022-12-14 14:02:33,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:33,059 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 281 transitions. [2022-12-14 14:02:33,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.857142857142857) internal successors, (246), 42 states have internal predecessors, (246), 37 states have call successors, (44), 8 states have call predecessors, (44), 16 states have return successors, (49), 18 states have call predecessors, (49), 31 states have call successors, (49) [2022-12-14 14:02:33,060 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 281 transitions. [2022-12-14 14:02:33,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6758 [2022-12-14 14:02:33,340 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:33,341 INFO L195 NwaCegarLoop]: trace histogram [693, 683, 562, 350, 350, 350, 350, 342, 342, 342, 342, 342, 341, 341, 341, 340, 212, 131, 1, 1, 1] [2022-12-14 14:02:33,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 14:02:33,542 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:33,542 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-12-14 14:02:33,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:33,546 INFO L85 PathProgramCache]: Analyzing trace with hash -1771871014, now seen corresponding path program 17 times [2022-12-14 14:02:33,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:33,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977166578] [2022-12-14 14:02:33,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:33,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:34,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:03:51,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1693382 backedges. 20888 proven. 74133 refuted. 0 times theorem prover too weak. 1598361 trivial. 0 not checked. [2022-12-14 14:03:51,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:03:51,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977166578] [2022-12-14 14:03:51,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977166578] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:03:51,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915543629] [2022-12-14 14:03:51,918 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:03:51,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:03:51,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:03:51,919 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:03:51,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8f82d20a-9071-478b-ad45-ae69471602a0/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 14:03:57,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 303 check-sat command(s) [2022-12-14 14:03:57,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:03:57,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 7662 conjuncts, 793 conjunts are in the unsatisfiable core [2022-12-14 14:03:57,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:04:00,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1693382 backedges. 522284 proven. 102086 refuted. 0 times theorem prover too weak. 1069012 trivial. 0 not checked. [2022-12-14 14:04:00,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:05:56,066 WARN L233 SmtUtils]: Spent 9.12s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 278] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-12-14 14:06:05,116 WARN L233 SmtUtils]: Spent 8.99s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 301] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-12-14 14:06:15,528 WARN L233 SmtUtils]: Spent 10.38s on a formula simplification that was a NOOP. DAG size: 1294 (called from [L 278] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2022-12-14 14:06:26,172 WARN L233 SmtUtils]: Spent 10.59s on a formula simplification that was a NOOP. DAG size: 1294 (called from [L 301] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition)