./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci02.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta --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 b7261cadd839cd02322bb28945f92ad1bd2170c0a65dd385996b5ff81cbb1de7 --- 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-dbf71c6-m [2022-10-17 17:36:01,859 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:36:01,861 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:36:01,907 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:36:01,908 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:36:01,909 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:36:01,911 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:36:01,913 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:36:01,916 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:36:01,917 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:36:01,919 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:36:01,920 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:36:01,921 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:36:01,922 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:36:01,924 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:36:01,926 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:36:01,927 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:36:01,928 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:36:01,930 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:36:01,934 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:36:01,936 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:36:01,938 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:36:01,939 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:36:01,941 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:36:01,947 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:36:01,947 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:36:01,948 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:36:01,949 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:36:01,950 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:36:01,951 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:36:01,952 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:36:01,953 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:36:01,954 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:36:01,955 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:36:01,956 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:36:01,957 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:36:01,958 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:36:01,959 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:36:01,959 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:36:01,960 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:36:01,961 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:36:01,963 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/config/svcomp-Overflow-32bit-Taipan_Default.epf [2022-10-17 17:36:01,990 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:36:01,990 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:36:01,991 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:36:01,991 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:36:01,992 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:36:01,992 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:36:01,992 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:36:01,993 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:36:01,993 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:36:01,993 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:36:01,994 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:36:01,994 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:36:01,994 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:36:01,994 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:36:01,995 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:36:01,995 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:36:01,995 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:36:01,995 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:36:01,996 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:36:01,997 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:36:01,997 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-10-17 17:36:01,997 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:36:01,998 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:36:01,998 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:36:01,998 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:36:01,998 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:36:01,999 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:36:01,999 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-10-17 17:36:01,999 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:36:01,999 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:36:02,000 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:36:02,000 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:36:02,000 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:36:02,001 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:36:02,001 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:36:02,001 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:36:02,001 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:36:02,002 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:36:02,002 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:36:02,002 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:36:02,003 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:36:02,003 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:36:02,003 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:36:02,003 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_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b7261cadd839cd02322bb28945f92ad1bd2170c0a65dd385996b5ff81cbb1de7 [2022-10-17 17:36:02,274 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:36:02,313 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:36:02,315 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:36:02,317 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:36:02,317 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:36:02,319 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/recursive/Fibonacci02.c [2022-10-17 17:36:02,396 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/data/a5e0b49df/88767832dc3142dcae847d14390d29e1/FLAG620cd9c18 [2022-10-17 17:36:02,850 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:36:02,850 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/sv-benchmarks/c/recursive/Fibonacci02.c [2022-10-17 17:36:02,857 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/data/a5e0b49df/88767832dc3142dcae847d14390d29e1/FLAG620cd9c18 [2022-10-17 17:36:03,237 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/data/a5e0b49df/88767832dc3142dcae847d14390d29e1 [2022-10-17 17:36:03,239 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:36:03,240 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:36:03,242 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:36:03,243 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:36:03,246 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:36:03,247 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,248 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@de00f4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03, skipping insertion in model container [2022-10-17 17:36:03,249 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,256 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:36:03,269 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:36:03,459 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/sv-benchmarks/c/recursive/Fibonacci02.c[715,728] [2022-10-17 17:36:03,460 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:36:03,473 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:36:03,490 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/sv-benchmarks/c/recursive/Fibonacci02.c[715,728] [2022-10-17 17:36:03,491 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:36:03,505 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:36:03,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03 WrapperNode [2022-10-17 17:36:03,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:36:03,507 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:36:03,508 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:36:03,508 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:36:03,516 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,525 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,544 INFO L138 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-10-17 17:36:03,544 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:36:03,546 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:36:03,546 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:36:03,547 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:36:03,557 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,557 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,559 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,559 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,569 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,572 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,573 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,574 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,581 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:36:03,582 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:36:03,583 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:36:03,583 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:36:03,584 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (1/1) ... [2022-10-17 17:36:03,591 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:36:03,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:03,630 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:36:03,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:36:03,694 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2022-10-17 17:36:03,694 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2022-10-17 17:36:03,695 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:36:03,695 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:36:03,695 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:36:03,695 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:36:03,766 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:36:03,769 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:36:03,982 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:36:04,015 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:36:04,015 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-10-17 17:36:04,034 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:36:04 BoogieIcfgContainer [2022-10-17 17:36:04,034 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:36:04,037 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:36:04,037 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:36:04,060 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:36:04,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:36:03" (1/3) ... [2022-10-17 17:36:04,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75183f37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:36:04, skipping insertion in model container [2022-10-17 17:36:04,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:36:03" (2/3) ... [2022-10-17 17:36:04,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75183f37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:36:04, skipping insertion in model container [2022-10-17 17:36:04,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:36:04" (3/3) ... [2022-10-17 17:36:04,063 INFO L112 eAbstractionObserver]: Analyzing ICFG Fibonacci02.c [2022-10-17 17:36:04,086 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:36:04,087 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2022-10-17 17:36:04,160 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:36:04,174 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;@395b5114, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:36:04,175 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2022-10-17 17:36:04,179 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) [2022-10-17 17:36:04,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-10-17 17:36:04,189 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:04,189 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-10-17 17:36:04,190 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:04,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:04,196 INFO L85 PathProgramCache]: Analyzing trace with hash -1991701821, now seen corresponding path program 1 times [2022-10-17 17:36:04,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:04,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356549308] [2022-10-17 17:36:04,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:04,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:04,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:04,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:36:04,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:04,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356549308] [2022-10-17 17:36:04,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356549308] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:36:04,549 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:36:04,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:36:04,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32697503] [2022-10-17 17:36:04,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:36:04,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:36:04,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:04,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:36:04,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:36:04,599 INFO L87 Difference]: Start difference. First operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:36:04,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:04,705 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-10-17 17:36:04,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:36:04,708 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-10-17 17:36:04,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:04,716 INFO L225 Difference]: With dead ends: 25 [2022-10-17 17:36:04,716 INFO L226 Difference]: Without dead ends: 21 [2022-10-17 17:36:04,720 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 [2022-10-17 17:36:04,726 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:04,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 17 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:36:04,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-10-17 17:36:04,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-10-17 17:36:04,773 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) [2022-10-17 17:36:04,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-10-17 17:36:04,778 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 6 [2022-10-17 17:36:04,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:04,779 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-10-17 17:36:04,780 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:36:04,780 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-10-17 17:36:04,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-10-17 17:36:04,783 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:04,783 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:04,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:36:04,784 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:04,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:04,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1613214265, now seen corresponding path program 1 times [2022-10-17 17:36:04,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:04,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400857815] [2022-10-17 17:36:04,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:04,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:04,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:04,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:36:04,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:04,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400857815] [2022-10-17 17:36:04,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400857815] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:36:04,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:36:04,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:36:04,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39095106] [2022-10-17 17:36:04,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:36:04,875 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:36:04,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:04,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:36:04,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:36:04,878 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:36:04,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:04,919 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-10-17 17:36:04,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:36:04,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-10-17 17:36:04,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:04,923 INFO L225 Difference]: With dead ends: 23 [2022-10-17 17:36:04,923 INFO L226 Difference]: Without dead ends: 21 [2022-10-17 17:36:04,928 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 [2022-10-17 17:36:04,931 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 11 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:04,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 18 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:36:04,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-10-17 17:36:04,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-10-17 17:36:04,954 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) [2022-10-17 17:36:04,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-10-17 17:36:04,957 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 7 [2022-10-17 17:36:04,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:04,959 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-10-17 17:36:04,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:36:04,960 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-10-17 17:36:04,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-10-17 17:36:04,963 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:04,963 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:04,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-17 17:36:04,964 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:04,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:04,975 INFO L85 PathProgramCache]: Analyzing trace with hash -796740598, now seen corresponding path program 1 times [2022-10-17 17:36:04,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:04,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750842233] [2022-10-17 17:36:04,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:04,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:05,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:05,259 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-10-17 17:36:05,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:05,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750842233] [2022-10-17 17:36:05,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750842233] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:36:05,260 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:36:05,260 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:36:05,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781733447] [2022-10-17 17:36:05,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:36:05,261 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:36:05,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:05,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:36:05,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:36:05,262 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) [2022-10-17 17:36:05,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:05,334 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-10-17 17:36:05,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:36:05,336 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 [2022-10-17 17:36:05,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:05,337 INFO L225 Difference]: With dead ends: 35 [2022-10-17 17:36:05,337 INFO L226 Difference]: Without dead ends: 33 [2022-10-17 17:36:05,338 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 [2022-10-17 17:36:05,339 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 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, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:05,340 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 45 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:36:05,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-10-17 17:36:05,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2022-10-17 17:36:05,353 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) [2022-10-17 17:36:05,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2022-10-17 17:36:05,360 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 28 [2022-10-17 17:36:05,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:05,361 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2022-10-17 17:36:05,362 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) [2022-10-17 17:36:05,363 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2022-10-17 17:36:05,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-10-17 17:36:05,366 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:05,366 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:05,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-17 17:36:05,366 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:05,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:05,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1082308036, now seen corresponding path program 1 times [2022-10-17 17:36:05,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:05,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073614641] [2022-10-17 17:36:05,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:05,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:05,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:05,550 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-10-17 17:36:05,550 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:05,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073614641] [2022-10-17 17:36:05,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073614641] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:05,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029455012] [2022-10-17 17:36:05,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:05,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:05,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:05,554 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:05,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:36:05,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:05,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2022-10-17 17:36:05,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:05,744 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:36:05,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:36:05,906 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:36:05,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029455012] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:36:05,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1107469454] [2022-10-17 17:36:05,925 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-10-17 17:36:05,925 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:36:05,930 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:336) 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) [2022-10-17 17:36:05,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:36:05,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 9] total 19 [2022-10-17 17:36:05,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052063220] [2022-10-17 17:36:05,933 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:36:05,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-10-17 17:36:05,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:05,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-10-17 17:36:05,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2022-10-17 17:36:05,937 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 19 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 15 states have internal predecessors, (53), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2022-10-17 17:36:06,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:06,512 INFO L93 Difference]: Finished difference Result 177 states and 247 transitions. [2022-10-17 17:36:06,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-10-17 17:36:06,513 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 15 states have internal predecessors, (53), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) Word has length 29 [2022-10-17 17:36:06,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:06,517 INFO L225 Difference]: With dead ends: 177 [2022-10-17 17:36:06,517 INFO L226 Difference]: Without dead ends: 144 [2022-10-17 17:36:06,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2022-10-17 17:36:06,521 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 201 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:06,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [207 Valid, 233 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-10-17 17:36:06,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-10-17 17:36:06,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 128. [2022-10-17 17:36:06,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 99 states have (on average 1.1111111111111112) internal successors, (110), 101 states have internal predecessors, (110), 17 states have call successors, (17), 5 states have call predecessors, (17), 10 states have return successors, (46), 21 states have call predecessors, (46), 16 states have call successors, (46) [2022-10-17 17:36:06,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 173 transitions. [2022-10-17 17:36:06,554 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 173 transitions. Word has length 29 [2022-10-17 17:36:06,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:06,554 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 173 transitions. [2022-10-17 17:36:06,555 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 15 states have internal predecessors, (53), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2022-10-17 17:36:06,555 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 173 transitions. [2022-10-17 17:36:06,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-10-17 17:36:06,558 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:06,558 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:06,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:06,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:06,767 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:06,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:06,768 INFO L85 PathProgramCache]: Analyzing trace with hash 57867452, now seen corresponding path program 2 times [2022-10-17 17:36:06,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:06,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65146493] [2022-10-17 17:36:06,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:06,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:06,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:06,966 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-10-17 17:36:06,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:06,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65146493] [2022-10-17 17:36:06,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65146493] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:06,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709004153] [2022-10-17 17:36:06,968 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:36:06,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:06,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:06,976 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:06,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:36:07,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-10-17 17:36:07,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:36:07,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2022-10-17 17:36:07,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:07,124 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-10-17 17:36:07,124 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:36:07,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709004153] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:36:07,124 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-10-17 17:36:07,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2022-10-17 17:36:07,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740780636] [2022-10-17 17:36:07,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:36:07,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:36:07,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:07,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:36:07,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-10-17 17:36:07,127 INFO L87 Difference]: Start difference. First operand 128 states and 173 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) [2022-10-17 17:36:07,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:07,184 INFO L93 Difference]: Finished difference Result 142 states and 189 transitions. [2022-10-17 17:36:07,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:36:07,187 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 41 [2022-10-17 17:36:07,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:07,195 INFO L225 Difference]: With dead ends: 142 [2022-10-17 17:36:07,196 INFO L226 Difference]: Without dead ends: 141 [2022-10-17 17:36:07,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-10-17 17:36:07,199 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 7 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:07,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 56 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:36:07,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-10-17 17:36:07,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 132. [2022-10-17 17:36:07,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 103 states have (on average 1.1067961165048543) internal successors, (114), 103 states have internal predecessors, (114), 17 states have call successors, (17), 5 states have call predecessors, (17), 10 states have return successors, (46), 23 states have call predecessors, (46), 16 states have call successors, (46) [2022-10-17 17:36:07,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 177 transitions. [2022-10-17 17:36:07,257 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 177 transitions. Word has length 41 [2022-10-17 17:36:07,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:07,258 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 177 transitions. [2022-10-17 17:36:07,258 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) [2022-10-17 17:36:07,259 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 177 transitions. [2022-10-17 17:36:07,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-10-17 17:36:07,265 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:07,265 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:07,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:07,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:07,469 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:07,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:07,470 INFO L85 PathProgramCache]: Analyzing trace with hash 1793891066, now seen corresponding path program 1 times [2022-10-17 17:36:07,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:07,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935612064] [2022-10-17 17:36:07,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:07,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:07,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-10-17 17:36:07,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:07,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935612064] [2022-10-17 17:36:07,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935612064] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:07,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861400305] [2022-10-17 17:36:07,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:07,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:07,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:07,610 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:07,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:36:07,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:07,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 12 conjunts are in the unsatisfiable core [2022-10-17 17:36:07,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:07,842 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:36:07,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:36:08,146 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:36:08,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861400305] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:36:08,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [990618546] [2022-10-17 17:36:08,151 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-10-17 17:36:08,151 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:36:08,152 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:336) 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) [2022-10-17 17:36:08,155 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:36:08,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 13, 13] total 25 [2022-10-17 17:36:08,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361060158] [2022-10-17 17:36:08,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:36:08,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-10-17 17:36:08,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:08,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-10-17 17:36:08,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2022-10-17 17:36:08,159 INFO L87 Difference]: Start difference. First operand 132 states and 177 transitions. Second operand has 25 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 18 states have internal predecessors, (71), 12 states have call successors, (15), 9 states have call predecessors, (15), 5 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2022-10-17 17:36:09,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:09,303 INFO L93 Difference]: Finished difference Result 423 states and 639 transitions. [2022-10-17 17:36:09,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-10-17 17:36:09,304 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 18 states have internal predecessors, (71), 12 states have call successors, (15), 9 states have call predecessors, (15), 5 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) Word has length 42 [2022-10-17 17:36:09,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:09,309 INFO L225 Difference]: With dead ends: 423 [2022-10-17 17:36:09,309 INFO L226 Difference]: Without dead ends: 305 [2022-10-17 17:36:09,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=278, Invalid=1362, Unknown=0, NotChecked=0, Total=1640 [2022-10-17 17:36:09,318 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 280 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 1068 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 1208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 1068 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:09,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [286 Valid, 549 Invalid, 1208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 1068 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-10-17 17:36:09,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2022-10-17 17:36:09,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 270. [2022-10-17 17:36:09,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 212 states have (on average 1.099056603773585) internal successors, (233), 212 states have internal predecessors, (233), 34 states have call successors, (34), 10 states have call predecessors, (34), 22 states have return successors, (103), 47 states have call predecessors, (103), 33 states have call successors, (103) [2022-10-17 17:36:09,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 370 transitions. [2022-10-17 17:36:09,393 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 370 transitions. Word has length 42 [2022-10-17 17:36:09,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:09,396 INFO L495 AbstractCegarLoop]: Abstraction has 270 states and 370 transitions. [2022-10-17 17:36:09,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 18 states have internal predecessors, (71), 12 states have call successors, (15), 9 states have call predecessors, (15), 5 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2022-10-17 17:36:09,397 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 370 transitions. [2022-10-17 17:36:09,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-10-17 17:36:09,403 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:09,404 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:09,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:09,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-10-17 17:36:09,633 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:09,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:09,633 INFO L85 PathProgramCache]: Analyzing trace with hash 258123870, now seen corresponding path program 1 times [2022-10-17 17:36:09,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:09,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434521680] [2022-10-17 17:36:09,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:09,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:09,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:09,774 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2022-10-17 17:36:09,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:09,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434521680] [2022-10-17 17:36:09,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434521680] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:36:09,775 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:36:09,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:36:09,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232925033] [2022-10-17 17:36:09,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:36:09,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:36:09,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:09,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:36:09,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:36:09,782 INFO L87 Difference]: Start difference. First operand 270 states and 370 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) [2022-10-17 17:36:09,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:09,838 INFO L93 Difference]: Finished difference Result 287 states and 393 transitions. [2022-10-17 17:36:09,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:36:09,838 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 66 [2022-10-17 17:36:09,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:09,844 INFO L225 Difference]: With dead ends: 287 [2022-10-17 17:36:09,844 INFO L226 Difference]: Without dead ends: 285 [2022-10-17 17:36:09,845 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 [2022-10-17 17:36:09,846 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 5 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:09,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 74 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:36:09,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2022-10-17 17:36:09,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 277. [2022-10-17 17:36:09,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 218 states have (on average 1.0963302752293578) internal successors, (239), 217 states have internal predecessors, (239), 35 states have call successors, (35), 10 states have call predecessors, (35), 22 states have return successors, (109), 49 states have call predecessors, (109), 34 states have call successors, (109) [2022-10-17 17:36:09,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 383 transitions. [2022-10-17 17:36:09,884 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 383 transitions. Word has length 66 [2022-10-17 17:36:09,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:09,884 INFO L495 AbstractCegarLoop]: Abstraction has 277 states and 383 transitions. [2022-10-17 17:36:09,885 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) [2022-10-17 17:36:09,885 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 383 transitions. [2022-10-17 17:36:09,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-10-17 17:36:09,887 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:09,888 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 9, 9, 9, 9, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:09,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-10-17 17:36:09,888 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:09,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:09,889 INFO L85 PathProgramCache]: Analyzing trace with hash -322617619, now seen corresponding path program 1 times [2022-10-17 17:36:09,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:09,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426927783] [2022-10-17 17:36:09,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:09,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:09,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:10,035 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2022-10-17 17:36:10,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:10,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426927783] [2022-10-17 17:36:10,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426927783] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:10,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025372725] [2022-10-17 17:36:10,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:10,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:10,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:10,041 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:10,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-10-17 17:36:10,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:10,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 20 conjunts are in the unsatisfiable core [2022-10-17 17:36:10,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 100 proven. 184 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-10-17 17:36:10,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:36:10,790 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 2 proven. 285 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 17:36:10,790 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025372725] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:36:10,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1141044819] [2022-10-17 17:36:10,793 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-10-17 17:36:10,793 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:36:10,793 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:336) 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) [2022-10-17 17:36:10,794 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:36:10,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 21, 21] total 25 [2022-10-17 17:36:10,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447308536] [2022-10-17 17:36:10,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:36:10,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-10-17 17:36:10,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:10,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-10-17 17:36:10,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2022-10-17 17:36:10,797 INFO L87 Difference]: Start difference. First operand 277 states and 383 transitions. Second operand has 25 states, 24 states have (on average 3.4583333333333335) internal successors, (83), 17 states have internal predecessors, (83), 12 states have call successors, (16), 10 states have call predecessors, (16), 4 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2022-10-17 17:36:11,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:11,535 INFO L93 Difference]: Finished difference Result 601 states and 874 transitions. [2022-10-17 17:36:11,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-10-17 17:36:11,536 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.4583333333333335) internal successors, (83), 17 states have internal predecessors, (83), 12 states have call successors, (16), 10 states have call predecessors, (16), 4 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 84 [2022-10-17 17:36:11,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:11,540 INFO L225 Difference]: With dead ends: 601 [2022-10-17 17:36:11,540 INFO L226 Difference]: Without dead ends: 338 [2022-10-17 17:36:11,543 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 138 SyntacticMatches, 18 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=264, Invalid=996, Unknown=0, NotChecked=0, Total=1260 [2022-10-17 17:36:11,544 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 358 mSDsluCounter, 351 mSDsCounter, 0 mSdLazyCounter, 601 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 409 SdHoareTripleChecker+Invalid, 711 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 601 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:11,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [362 Valid, 409 Invalid, 711 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 601 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-10-17 17:36:11,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2022-10-17 17:36:11,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 305. [2022-10-17 17:36:11,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 240 states have (on average 1.0958333333333334) internal successors, (263), 239 states have internal predecessors, (263), 39 states have call successors, (39), 11 states have call predecessors, (39), 24 states have return successors, (124), 54 states have call predecessors, (124), 38 states have call successors, (124) [2022-10-17 17:36:11,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 426 transitions. [2022-10-17 17:36:11,579 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 426 transitions. Word has length 84 [2022-10-17 17:36:11,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:11,580 INFO L495 AbstractCegarLoop]: Abstraction has 305 states and 426 transitions. [2022-10-17 17:36:11,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.4583333333333335) internal successors, (83), 17 states have internal predecessors, (83), 12 states have call successors, (16), 10 states have call predecessors, (16), 4 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2022-10-17 17:36:11,580 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 426 transitions. [2022-10-17 17:36:11,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-10-17 17:36:11,583 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:11,583 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 9, 9, 9, 9, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:11,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:11,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:11,797 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:11,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:11,797 INFO L85 PathProgramCache]: Analyzing trace with hash 442857087, now seen corresponding path program 2 times [2022-10-17 17:36:11,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:11,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922075698] [2022-10-17 17:36:11,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:11,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:11,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:12,234 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 178 proven. 119 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 17:36:12,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:12,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922075698] [2022-10-17 17:36:12,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922075698] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:12,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59725537] [2022-10-17 17:36:12,234 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:36:12,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:12,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:12,236 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:12,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-10-17 17:36:12,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-10-17 17:36:12,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:36:12,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2022-10-17 17:36:12,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:12,383 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 44 proven. 3 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-10-17 17:36:12,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:36:12,616 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 44 proven. 3 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-10-17 17:36:12,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59725537] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:36:12,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2006427180] [2022-10-17 17:36:12,621 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-10-17 17:36:12,621 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:36:12,622 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java: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:336) 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) [2022-10-17 17:36:12,623 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:36:12,623 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7, 7] total 27 [2022-10-17 17:36:12,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461560532] [2022-10-17 17:36:12,623 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:36:12,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-10-17 17:36:12,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:12,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-10-17 17:36:12,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2022-10-17 17:36:12,626 INFO L87 Difference]: Start difference. First operand 305 states and 426 transitions. Second operand has 27 states, 26 states have (on average 3.269230769230769) internal successors, (85), 19 states have internal predecessors, (85), 12 states have call successors, (16), 9 states have call predecessors, (16), 5 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2022-10-17 17:36:13,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:13,405 INFO L93 Difference]: Finished difference Result 464 states and 643 transitions. [2022-10-17 17:36:13,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-10-17 17:36:13,406 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.269230769230769) internal successors, (85), 19 states have internal predecessors, (85), 12 states have call successors, (16), 9 states have call predecessors, (16), 5 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 85 [2022-10-17 17:36:13,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:13,408 INFO L225 Difference]: With dead ends: 464 [2022-10-17 17:36:13,408 INFO L226 Difference]: Without dead ends: 173 [2022-10-17 17:36:13,412 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 170 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=585, Invalid=1485, Unknown=0, NotChecked=0, Total=2070 [2022-10-17 17:36:13,413 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 624 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:13,414 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [624 Valid, 138 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 561 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-10-17 17:36:13,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-10-17 17:36:13,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 161. [2022-10-17 17:36:13,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 127 states have (on average 1.141732283464567) internal successors, (145), 128 states have internal predecessors, (145), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-10-17 17:36:13,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 186 transitions. [2022-10-17 17:36:13,427 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 186 transitions. Word has length 85 [2022-10-17 17:36:13,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:13,427 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 186 transitions. [2022-10-17 17:36:13,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.269230769230769) internal successors, (85), 19 states have internal predecessors, (85), 12 states have call successors, (16), 9 states have call predecessors, (16), 5 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2022-10-17 17:36:13,428 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 186 transitions. [2022-10-17 17:36:13,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-10-17 17:36:13,429 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:13,429 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 8, 8, 8, 8, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-10-17 17:36:13,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:13,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:13,645 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:13,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:13,645 INFO L85 PathProgramCache]: Analyzing trace with hash 241353604, now seen corresponding path program 3 times [2022-10-17 17:36:13,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:13,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161465529] [2022-10-17 17:36:13,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:13,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:13,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:13,849 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 241 trivial. 0 not checked. [2022-10-17 17:36:13,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:13,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161465529] [2022-10-17 17:36:13,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161465529] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:13,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827314434] [2022-10-17 17:36:13,850 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:36:13,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:13,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:13,851 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:13,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-10-17 17:36:13,908 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:36:13,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:36:13,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 9 conjunts are in the unsatisfiable core [2022-10-17 17:36:13,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:14,006 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2022-10-17 17:36:14,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:36:14,186 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2022-10-17 17:36:14,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1827314434] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:36:14,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2083664006] [2022-10-17 17:36:14,191 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-10-17 17:36:14,192 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:36:14,192 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:336) 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) [2022-10-17 17:36:14,193 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:36:14,194 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2022-10-17 17:36:14,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230002402] [2022-10-17 17:36:14,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:36:14,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-10-17 17:36:14,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:14,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-10-17 17:36:14,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-10-17 17:36:14,199 INFO L87 Difference]: Start difference. First operand 161 states and 186 transitions. Second operand has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2022-10-17 17:36:14,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:14,310 INFO L93 Difference]: Finished difference Result 164 states and 186 transitions. [2022-10-17 17:36:14,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-10-17 17:36:14,311 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) Word has length 79 [2022-10-17 17:36:14,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:14,313 INFO L225 Difference]: With dead ends: 164 [2022-10-17 17:36:14,313 INFO L226 Difference]: Without dead ends: 162 [2022-10-17 17:36:14,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 149 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2022-10-17 17:36:14,315 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 16 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:14,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 110 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:36:14,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-10-17 17:36:14,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2022-10-17 17:36:14,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 127 states have (on average 1.1181102362204725) internal successors, (142), 128 states have internal predecessors, (142), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-10-17 17:36:14,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 183 transitions. [2022-10-17 17:36:14,340 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 183 transitions. Word has length 79 [2022-10-17 17:36:14,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:14,341 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 183 transitions. [2022-10-17 17:36:14,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2022-10-17 17:36:14,342 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 183 transitions. [2022-10-17 17:36:14,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-10-17 17:36:14,343 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:14,343 INFO L195 NwaCegarLoop]: trace histogram [14, 12, 9, 9, 9, 9, 8, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1] [2022-10-17 17:36:14,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:14,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-10-17 17:36:14,565 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:14,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:14,565 INFO L85 PathProgramCache]: Analyzing trace with hash -411533489, now seen corresponding path program 1 times [2022-10-17 17:36:14,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:14,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233924484] [2022-10-17 17:36:14,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:14,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:14,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:14,998 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-10-17 17:36:14,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:14,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233924484] [2022-10-17 17:36:14,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233924484] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:14,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443122369] [2022-10-17 17:36:14,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:15,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:15,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:15,001 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:15,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-10-17 17:36:15,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:15,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 16 conjunts are in the unsatisfiable core [2022-10-17 17:36:15,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:15,227 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 30 proven. 44 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2022-10-17 17:36:15,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:36:15,770 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 45 proven. 45 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2022-10-17 17:36:15,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443122369] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:36:15,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1141386625] [2022-10-17 17:36:15,775 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-10-17 17:36:15,775 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:36:15,776 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:336) 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) [2022-10-17 17:36:15,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:36:15,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 13] total 25 [2022-10-17 17:36:15,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380076599] [2022-10-17 17:36:15,778 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:36:15,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-10-17 17:36:15,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:15,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-10-17 17:36:15,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2022-10-17 17:36:15,781 INFO L87 Difference]: Start difference. First operand 161 states and 183 transitions. Second operand has 26 states, 25 states have (on average 2.76) internal successors, (69), 26 states have internal predecessors, (69), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) [2022-10-17 17:36:15,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:15,914 INFO L93 Difference]: Finished difference Result 161 states and 183 transitions. [2022-10-17 17:36:15,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-10-17 17:36:15,915 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.76) internal successors, (69), 26 states have internal predecessors, (69), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) Word has length 113 [2022-10-17 17:36:15,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:15,917 INFO L225 Difference]: With dead ends: 161 [2022-10-17 17:36:15,917 INFO L226 Difference]: Without dead ends: 159 [2022-10-17 17:36:15,918 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 212 SyntacticMatches, 5 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=187, Invalid=625, Unknown=0, NotChecked=0, Total=812 [2022-10-17 17:36:15,919 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 30 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:15,919 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 104 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:36:15,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-10-17 17:36:15,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2022-10-17 17:36:15,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 126 states have (on average 1.0555555555555556) internal successors, (133), 126 states have internal predecessors, (133), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-10-17 17:36:15,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 174 transitions. [2022-10-17 17:36:15,934 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 174 transitions. Word has length 113 [2022-10-17 17:36:15,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:15,935 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 174 transitions. [2022-10-17 17:36:15,935 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.76) internal successors, (69), 26 states have internal predecessors, (69), 6 states have call successors, (7), 1 states have call predecessors, (7), 9 states have return successors, (15), 14 states have call predecessors, (15), 6 states have call successors, (15) [2022-10-17 17:36:15,935 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 174 transitions. [2022-10-17 17:36:15,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2022-10-17 17:36:15,938 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:15,939 INFO L195 NwaCegarLoop]: trace histogram [19, 16, 14, 11, 11, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 3, 1, 1, 1] [2022-10-17 17:36:15,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:16,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-10-17 17:36:16,153 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:16,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:16,153 INFO L85 PathProgramCache]: Analyzing trace with hash -1987983501, now seen corresponding path program 4 times [2022-10-17 17:36:16,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:16,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185107682] [2022-10-17 17:36:16,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:16,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:16,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:16,840 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 78 proven. 183 refuted. 0 times theorem prover too weak. 689 trivial. 0 not checked. [2022-10-17 17:36:16,841 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:16,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185107682] [2022-10-17 17:36:16,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185107682] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:16,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959220051] [2022-10-17 17:36:16,841 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-10-17 17:36:16,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:16,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:16,845 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:16,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-10-17 17:36:16,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:16,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 29 conjunts are in the unsatisfiable core [2022-10-17 17:36:16,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:17,175 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 78 proven. 129 refuted. 0 times theorem prover too weak. 743 trivial. 0 not checked. [2022-10-17 17:36:17,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:36:18,553 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 144 proven. 122 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2022-10-17 17:36:18,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959220051] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:36:18,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [416346801] [2022-10-17 17:36:18,556 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-10-17 17:36:18,556 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:36:18,557 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:336) 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) [2022-10-17 17:36:18,557 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:36:18,557 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2022-10-17 17:36:18,557 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748191585] [2022-10-17 17:36:18,557 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:36:18,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-10-17 17:36:18,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:18,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-10-17 17:36:18,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2022-10-17 17:36:18,560 INFO L87 Difference]: Start difference. First operand 159 states and 174 transitions. Second operand has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 32 states have internal predecessors, (80), 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) [2022-10-17 17:36:18,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:18,700 INFO L93 Difference]: Finished difference Result 160 states and 174 transitions. [2022-10-17 17:36:18,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-10-17 17:36:18,701 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 32 states have internal predecessors, (80), 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 165 [2022-10-17 17:36:18,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:18,703 INFO L225 Difference]: With dead ends: 160 [2022-10-17 17:36:18,703 INFO L226 Difference]: Without dead ends: 159 [2022-10-17 17:36:18,704 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 314 SyntacticMatches, 13 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=265, Invalid=857, Unknown=0, NotChecked=0, Total=1122 [2022-10-17 17:36:18,705 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 27 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:18,706 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 134 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:36:18,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-10-17 17:36:18,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2022-10-17 17:36:18,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-10-17 17:36:18,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 170 transitions. [2022-10-17 17:36:18,719 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 170 transitions. Word has length 165 [2022-10-17 17:36:18,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:18,720 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 170 transitions. [2022-10-17 17:36:18,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.5806451612903225) internal successors, (80), 32 states have internal predecessors, (80), 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) [2022-10-17 17:36:18,721 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 170 transitions. [2022-10-17 17:36:18,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 409 [2022-10-17 17:36:18,729 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:18,729 INFO L195 NwaCegarLoop]: trace histogram [43, 40, 35, 22, 22, 22, 22, 20, 20, 20, 20, 20, 20, 20, 19, 19, 13, 8, 1, 1, 1] [2022-10-17 17:36:18,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:18,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-10-17 17:36:18,957 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:18,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:18,957 INFO L85 PathProgramCache]: Analyzing trace with hash -1645075376, now seen corresponding path program 5 times [2022-10-17 17:36:18,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:18,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550717544] [2022-10-17 17:36:18,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:18,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:19,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:36:23,079 INFO L134 CoverageAnalysis]: Checked inductivity of 5965 backedges. 830 proven. 1451 refuted. 0 times theorem prover too weak. 3684 trivial. 0 not checked. [2022-10-17 17:36:23,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:36:23,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550717544] [2022-10-17 17:36:23,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550717544] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:36:23,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472248702] [2022-10-17 17:36:23,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:36:23,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:36:23,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:36:23,081 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:36:23,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-10-17 17:36:23,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-10-17 17:36:23,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:36:23,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 81 conjunts are in the unsatisfiable core [2022-10-17 17:36:23,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:36:23,830 INFO L134 CoverageAnalysis]: Checked inductivity of 5965 backedges. 820 proven. 1093 refuted. 0 times theorem prover too weak. 4052 trivial. 0 not checked. [2022-10-17 17:36:23,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:36:31,264 INFO L134 CoverageAnalysis]: Checked inductivity of 5965 backedges. 1149 proven. 996 refuted. 0 times theorem prover too weak. 3820 trivial. 0 not checked. [2022-10-17 17:36:31,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472248702] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:36:31,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074516203] [2022-10-17 17:36:31,267 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-10-17 17:36:31,267 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:36:31,268 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:336) 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) [2022-10-17 17:36:31,276 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:36:31,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2022-10-17 17:36:31,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241377683] [2022-10-17 17:36:31,277 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:36:31,279 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-10-17 17:36:31,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:36:31,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-10-17 17:36:31,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2022-10-17 17:36:31,281 INFO L87 Difference]: Start difference. First operand 159 states and 170 transitions. Second operand has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) [2022-10-17 17:36:31,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:36:31,496 INFO L93 Difference]: Finished difference Result 160 states and 170 transitions. [2022-10-17 17:36:31,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-10-17 17:36:31,497 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) Word has length 408 [2022-10-17 17:36:31,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:36:31,501 INFO L225 Difference]: With dead ends: 160 [2022-10-17 17:36:31,501 INFO L226 Difference]: Without dead ends: 159 [2022-10-17 17:36:31,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 897 GetRequests, 800 SyntacticMatches, 51 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2407 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=510, Invalid=1746, Unknown=0, NotChecked=0, Total=2256 [2022-10-17 17:36:31,504 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 49 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:36:31,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 186 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:36:31,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-10-17 17:36:31,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2022-10-17 17:36:31,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 126 states have (on average 1.007936507936508) internal successors, (127), 126 states have internal predecessors, (127), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-10-17 17:36:31,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 168 transitions. [2022-10-17 17:36:31,518 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 168 transitions. Word has length 408 [2022-10-17 17:36:31,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:36:31,520 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 168 transitions. [2022-10-17 17:36:31,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) [2022-10-17 17:36:31,520 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 168 transitions. [2022-10-17 17:36:31,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1064 [2022-10-17 17:36:31,569 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:36:31,569 INFO L195 NwaCegarLoop]: trace histogram [109, 108, 88, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 53, 53, 34, 21, 1, 1, 1] [2022-10-17 17:36:31,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-10-17 17:36:31,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_68c2bcf8-4903-4fb2-93a8-062cf7e61b59/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-10-17 17:36:31,797 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-10-17 17:36:31,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:36:31,798 INFO L85 PathProgramCache]: Analyzing trace with hash 1750529970, now seen corresponding path program 6 times [2022-10-17 17:36:31,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:36:31,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824410088] [2022-10-17 17:36:31,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:36:31,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:36:32,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat