Debug error in node_mksnapshot

[targos]

https://ci.nodejs.org/job/node-test-commit-linux-containered/22283/nodes=ubuntu1804_sharedlibs_debug_x64/console

09:49:51   LD_LIBRARY_PATH=/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/lib.host:/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/lib.target:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; cd ../.; mkdir -p /home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/obj/gen; "/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/mkcodecache" "/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/obj/gen/node_code_cache.cc"
09:49:51   LD_LIBRARY_PATH=/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/lib.host:/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/lib.target:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; cd ../.; mkdir -p /home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/obj/gen; "/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot" "/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/obj/gen/node_snapshot.cc"
09:49:51 
09:49:51 
09:49:51 #
09:49:51 # Fatal error in ../deps/v8/src/snapshot/context-serializer.cc, line 271
09:49:51 # Debug check failed: reference.is_back_reference().
09:49:51 #
09:49:51 #
09:49:51 #
09:49:51 #FailureMessage Object: 0x7ffea6dd20b0
09:49:51  1: 0x5642b9226cd1 node::DumpBacktrace(_IO_FILE*) [/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot]
09:49:51  2: 0x5642b9396af9  [/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot]
09:49:51  3: 0x5642b9396b19  [/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot]
09:49:51  4: 0x5642ba57be86 V8_Fatal(char const*, int, char const*, ...) [/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot]
09:49:51  5: 0x5642ba57beb5  [/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot]
09:49:51  6: 0x5642ba3c5671 v8::internal::ContextSerializer::SerializeJSObjectWithEmbedderFields(v8::internal::Object) [/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot]
09:49:51  7: 0x5642ba3c6a82 v8::internal::ContextSerializer::SerializeObject(v8::internal::HeapObject) [/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot]
09:49:51  8: 0x5642b9f54fd2 v8::internal::Serializer::ObjectSerializer::VisitPointers(v8::internal::HeapObject, v8::internal::FullMaybeObjectSlot, v8::internal::FullMaybeObjectSlot) [/home/iojs/build/workspace/node-test-commit-linux-containered/out/Debug/node_mksnapshot]
...

[targos]

/cc @joyeecheung ? Do we have a team to ping for these kind of issues?

[joyeecheung]

No, we don't have a team for this, from a glance I am guessing this is a V8 issue, I will try to reproduce locally and see what object this is. Also cc @nodejs/v8

[joyeecheung]

It looks like one of the typed arrays (async_hook_fields I think) in the global uncaught exception handler closure cannot be properly serialized, which might be related to this comment which I still have not figured out yet. I will see if I can give it another try..

https://github.com/nodejs/node/blob/423490423264d1b7624d578a421a1bedecbc5d2e/lib/internal/process/execution.js#L119-L126

See reference stack

Reference stack:
0xfc42315cf99: [NativeContext] in OldSpace
 - map: 0x0fc474305ba1 <Map>
 - length: 243
 - scope_info: 0x0fc4c5ec3299 <ScopeInfo SCRIPT_SCOPE [5]>
 - previous: 0
 - native_context: 0x0fc42315cf99 <NativeContext[243]>
           0: 0x0fc4c5ec3299 <ScopeInfo SCRIPT_SCOPE [5]>
           1: 0
           2: 0x0fc423176259 <JSObject>
           3: 0x0fc42315cf79 <JSGlobal Object>
           4: 0x0fc4222475d9 <Other heap object (EMBEDDER_DATA_ARRAY_TYPE)>
           5: 0x0fc4c5ec1599 <undefined>
           6: 0x0fc42316e121 <JSFunction next (sfi = 0xfc48aa58b81)>
           7: 0x0fc42316e159 <JSFunction next (sfi = 0xfc48aa58bc1)>
           8: 0x0fc42315e199 <JSFunction create (sfi = 0xfc48aa4df91)>
           9: 0x0fc42316c731 <JSFunction apply (sfi = 0xfc48aa57919)>
          10: 0x0fc42316c491 <JSFunction construct (sfi = 0xfc48aa57619)>
          11: 0x0fc42316d321 <JSFunction floor (sfi = 0xfc48aa58161)>
          12: 0x0fc42316d551 <JSFunction pow (sfi = 0xfc48aa583e1)>
          13: 0x0fc4c5ec1599 <undefined>
          14: 0x0fc423165c49 <JSFunction then (sfi = 0xfc48aa54221)>
          15: 0x0fc474308781 <Map(HOLEY_ELEMENTS)>
          16: 0x0fc4c5ec1599 <undefined>
          17: 0x0fc42316ded9 <JSFunction ArrayBuffer (sfi = 0xfc48aa58aa1)>
          18: 0x0fc4743086f1 <Map(HOLEY_ELEMENTS)>
          19: 0x0fc42316e209 <JSFunction arrayBufferConstructor_DoNotInitialize (sfi = 0xfc48aa58c01)>
          20: 0x0fc423167061 <JSFunction Array (sfi = 0xfc48aa54d59)>
          21: 0x0fc4c5ec1599 <undefined>
          22: 0x0fc4743087c9 <Map(HOLEY_ELEMENTS)>
          23: 0x0fc42316e499 <JSFunction AsyncFunction (sfi = 0xfc48aa58dc9)>
          24: 0x0fc474308979 <Map(HOLEY_ELEMENTS)>
          25: 0x0fc42316e651 <JSFunction AsyncGeneratorFunction (sfi = 0xfc48aa58e29)>
          26: 0x0fc42316eab9 <Object map = 0xfc474308ae1>
          27: 0x0fc423166639 <JSFunction BigInt (sfi = 0xfc48aa54781)>
          28: 0x0fc42316c139 <JSFunction BigInt64Array (sfi = 0xfc48aa575c1)>
          29: 0x0fc423165d71 <JSFunction BigUint64Array (sfi = 0xfc48aa542a1)>
          30: 0x0fc42316dc39 <JSFunction Boolean (sfi = 0xfc48aa58921)>
          31: 0x0fc474308b29 <Map(HOLEY_ELEMENTS)>
          32: 0x0fc474308b71 <Map(HOLEY_ELEMENTS)>
          33: 0x0fc42316ee79 <JSFunction (sfi = 0xfc48aa59371)>
          34: 0x0fc42316eeb1 <JSFunction (sfi = 0xfc48aa593b1)>
          35: 0x0fc42316eee9 <JSFunction (sfi = 0xfc48aa593f1)>
          36: 0x0fc42316ef21 <JSFunction (sfi = 0xfc48aa59431)>
          37: 0x0fc42316f001 <JSFunction CallSite (sfi = 0xfc48aa59471)>
          38: 0x0fc42316f771 <JSFunction (sfi = 0xfc48aa59bb1)>
          39: 0x0fc474308d21 <Map(HOLEY_ELEMENTS)>
          40: 0x0fc4231623a1 <JSFunction DataView (sfi = 0xfc48aa51441)>
          41: 0x0fc423162dc1 <JSFunction Date (sfi = 0xfc48aa51dd1)>
          42: 0x0fc4c5ec1599 <undefined>
          43: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
          44: 0x0fc4c5ec1599 <undefined>
          45: 0
          46: 0x0fc42316f911 <Object map = 0xfc474308d69>
          47: 0x0fc474308db1 <Map(FAST_SLOPPY_ARGUMENTS_ELEMENTS)>
          48: 0x0fc42316fab9 <FixedArray[1024]>
          49: 0x0fc423161f19 <JSFunction Float32Array (sfi = 0xfc48aa512e9)>
          50: 0x0fc423165529 <JSFunction Float64Array (sfi = 0xfc48aa53f59)>
          51: 0x0fc42315da31 <JSFunction Function (sfi = 0xfc48aa4da51)>
          52: 0x0fc423171b41 <JSFunction GeneratorFunction (sfi = 0xfc48aa59cd9)>
          53: 0x0fc474308fa9 <Map(HOLEY_ELEMENTS)>
          54: 0x0fc474308ff1 <Map(HOLEY_ELEMENTS)>
          55: 0x0fc474309039 <Map(HOLEY_ELEMENTS)>
          56: 0x0fc423171fc9 <Object map = 0xfc474309081>
          57: 0x0fc423167521 <JSArray[0]>
          58: 0x0fc423160e51 <Object map = 0xfc4743061d1>
          59: 0x0fc423171de1 <Object map = 0xfc474308f19>
          60: 0x0fc42316e271 <Object map = 0xfc474308859>
          61: 0x0fc42316e819 <Object map = 0xfc474308a99>
          62: 0x0fc423171ce1 <Object map = 0xfc474308f61>
          63: 0x0fc4231720f9 <Object map = 0xfc4743090c9>
          64: 0x0fc474306e79 <Map(HOLEY_ELEMENTS)>
          65: 0x0fc42315e669 <Object map = 0xfc474305c79>
          66: 0x0fc4231721e9 <Object map = 0xfc474309111>
          67: 0x0fc4231661c1 <Object map = 0xfc474306c81>
          68: 0x0fc474306c81 <Map(HOLEY_ELEMENTS)>
          69: 0x0fc474309159 <Map(HOLEY_ELEMENTS)>
          70: 0x0fc4231722d9 <Object map = 0xfc4743091a1>
          71: 0x0fc423164869 <Object map = 0xfc474306849 value = 0x0fc4c5ec17b1 <String[0]: #>>
          72: 0x0fc474307ec9 <Map(HOLEY_ELEMENTS)>
          73: 0x0fc474308589 <Map(HOLEY_ELEMENTS)>
          74: 0x0fc423168541 <JSFunction Int16Array (sfi = 0xfc48aa55681)>
          75: 0x0fc423165701 <JSFunction Int32Array (sfi = 0xfc48aa53f99)>
          76: 0x0fc423168719 <JSFunction Int8Array (sfi = 0xfc48aa556c1)>
          77: 0x0fc4231691d9 <JSFunction Collator (sfi = 0xfc48aa55c29)>
          78: 0x0fc42316aaa9 <JSFunction DateTimeFormat (sfi = 0xfc48aa56ac1)>
          79: 0x0fc42316a7e9 <JSFunction DisplayNames (sfi = 0xfc48aa56959)>
          80: 0x0fc42316ae61 <JSFunction NumberFormat (sfi = 0xfc48aa56d11)>
          81: 0x0fc42316a111 <JSFunction Locale (sfi = 0xfc48aa56401)>
          82: 0x0fc423169e29 <JSFunction ListFormat (sfi = 0xfc48aa562e1)>
          83: 0x0fc4231698a1 <JSFunction PluralRules (sfi = 0xfc48aa56021)>
          84: 0x0fc423169b29 <JSFunction RelativeTimeFormat (sfi = 0xfc48aa56159)>
       85-87: 0x0fc4c5ec1599 <undefined>
          88: 0x0fc4743091e9 <Map(HOLEY_ELEMENTS)>
          89: 0x0fc474306f09 <Map(PACKED_SMI_ELEMENTS)>
          90: 0x0fc474306fe1 <Map(HOLEY_SMI_ELEMENTS)>
          91: 0x0fc4743070b9 <Map(PACKED_ELEMENTS)>
          92: 0x0fc474307101 <Map(HOLEY_ELEMENTS)>
          93: 0x0fc474307029 <Map(PACKED_DOUBLE_ELEMENTS)>
          94: 0x0fc474307071 <Map(HOLEY_DOUBLE_ELEMENTS)>
          95: 0x0fc4231669e9 <JSFunction Map (sfi = 0xfc48aa548e9)>
          96: 0x0fc474306e31 <Map(HOLEY_ELEMENTS)>
          97: 0x0fc4743092c1 <Map(HOLEY_ELEMENTS)>
          98: 0x0fc423165f99 <JSFunction Set (sfi = 0xfc48aa54349)>
          99: 0x0fc474306c39 <Map(HOLEY_ELEMENTS)>
         100: 0x0fc42316b161 <JSFunction WeakMap (sfi = 0xfc48aa56e59)>
         101: 0x0fc42316d961 <JSFunction WeakSet (sfi = 0xfc48aa58821)>
     102-103: 0x0fc4c5ec1599 <undefined>
         104: 0x0fc474305ba1 <Map>
         105: 0x0fc474309309 <Map>
         106: 0x0fc474309351 <Map>
         107: 0x0fc474309399 <Map>
         108: 0x0fc4743093e1 <Map>
         109: 0x0fc474309429 <Map>
         110: 0x0fc474309471 <Map>
         111: 0x0fc4743094b9 <Map>
         112: 0x0fc474309501 <Map>
         113: 0x0fc474309549 <Map>
         114: 0x0fc423172401 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
         115: 0x0fc474309591 <Map(HOLEY_ELEMENTS)>
         116: 0x0fc4743095d9 <Map(HOLEY_ELEMENTS)>
         117: 0x0fc474309621 <Map(HOLEY_ELEMENTS)>
         118: 0
         119: 0x0fc423172851 <ByteArray[16]>
         120: 0x0fc423172871 <FixedDoubleArray[64]>
         121: 0x0fc423172a81 <FixedArray[1]>
         122: 0x0fc423172a99 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
         123: 0x0fc42316b7b1 <JSFunction Number (sfi = 0xfc48aa572d1)>
         124: 0x0fc42315dee1 <JSFunction Object (sfi = 0xfc48aa4e2d1)>
         125: 0x0fc474305c79 <Map(HOLEY_ELEMENTS)>
         126: 0x0fc474309669 <Map[32]>
         127: 0x0fc4743096b1 <Map[32]>
         128: 0x0fc42316c9c9 <JSFunction Proxy (sfi = 0xfc48aa579f9)>
         129: 0x0fc4743096f9 <Map[32]>
         130: 0x0fc474309741 <Map(HOLEY_ELEMENTS)>
         131: 0x0fc423165bb1 <Object map = 0xfc474306ad1>
         132: 0x0fc4c5ec1599 <undefined>
         133: 0x0fc423160b71 <JSFunction exec (sfi = 0xfc48aa50559)>
         134: 0x0fc4231604c1 <JSFunction RegExp (sfi = 0xfc48aa4ffc1)>
         135: 0x0fc423172cf1 <FixedArray[5]>
         136: 0x0fc423160a91 <JSFunction [Symbol.matchAll] (sfi = 0xfc48aa503d1)>
         137: 0x0fc423160a59 <JSFunction [Symbol.match] (sfi = 0xfc48aa50371)>
         138: 0x0fc4231609a9 <Object map = 0xfc4743060b1>
         139: 0x0fc4743060b1 <Map(HOLEY_ELEMENTS)>
         140: 0x0fc423160ac9 <JSFunction [Symbol.replace] (sfi = 0xfc48aa50439)>
         141: 0x0fc474309789 <Map(HOLEY_ELEMENTS)>
         142: 0x0fc4743097d1 <Map(HOLEY_ELEMENTS)>
         143: 0x0fc423160b01 <JSFunction [Symbol.search] (sfi = 0xfc48aa50499)>
         144: 0x0fc423160b39 <JSFunction [Symbol.split] (sfi = 0xfc48aa504f9)>
         145: 0x0fc474309819 <Map(HOLEY_ELEMENTS)>
         146: 0x0fc423172f79 <ScriptContextTable[2]>
         147: 0x0fc4c5ec1599 <undefined>
         148: 0x0fc423176259 <JSObject>
         149: 0x0fc4a181ea61 <FixedArray[35]>
         150: 0x0fc4743098a9 <Map(HOLEY_ELEMENTS)>
         151: 0x0fc4743098f1 <Map(HOLEY_ELEMENTS)>
         152: 0x0fc4231730e1 <JSFunction SharedArrayBuffer (sfi = 0xfc48aa5a1f9)>
         153: 0x0fc474308df9 <Map(PACKED_ELEMENTS)>
         154: 0x0fc474309a11 <Map(SLOW_SLOPPY_ARGUMENTS_ELEMENTS)>
         155: 0x0fc474309a59 <Map(PACKED_ELEMENTS)>
         156: 0x0fc474309aa1 <Map(HOLEY_ELEMENTS)>
         157: 0x0fc474309ae9 <Map(HOLEY_ELEMENTS)>
         158: 0x0fc423173391 <SimpleNumberDictionary[1027]>
         159: 0x0fc4231753b9 <OrderedHashSet[13]>
         160: 0x0fc423175431 <PropertyCell name=0x0fc4c5ec17b1 <String[0]: #> value=1>
         161: 0x0fc474305de1 <Map(HOLEY_ELEMENTS)>
         162: 0x0fc474309b31 <Map(HOLEY_ELEMENTS)>
         163: 0x0fc474309b79 <Map(HOLEY_ELEMENTS)>
         164: 0x0fc474309bc1 <Map(HOLEY_ELEMENTS)>
         165: 0x0fc474305eb9 <Map(HOLEY_ELEMENTS)>
         166: 0x0fc474309c09 <Map(HOLEY_ELEMENTS)>
         167: 0x0fc474308bb9 <Map(HOLEY_ELEMENTS)>
         168: 0x0fc474305e29 <Map(HOLEY_ELEMENTS)>
         169: 0x0fc474309c51 <Map(HOLEY_ELEMENTS)>
         170: 0x0fc474309c99 <Map(HOLEY_ELEMENTS)>
         171: 0x0fc474309ce1 <Map(HOLEY_ELEMENTS)>
         172: 0x0fc474309d29 <Map(HOLEY_ELEMENTS)>
         173: 0x0fc474309d71 <Map(HOLEY_ELEMENTS)>
         174: 0x0fc474309db9 <Map(HOLEY_ELEMENTS)>
         175: 0x0fc474309e01 <Map(HOLEY_ELEMENTS)>
         176: 0x0fc474308e89 <Map(HOLEY_ELEMENTS)>
         177: 0x0fc474309e49 <Map(HOLEY_ELEMENTS)>
         178: 0x0fc474309e91 <Map(HOLEY_ELEMENTS)>
         179: 0x0fc474309ed9 <Map(HOLEY_ELEMENTS)>
         180: 0x0fc474308a09 <Map(HOLEY_ELEMENTS)>
         181: 0x0fc474309f21 <Map(HOLEY_ELEMENTS)>
         182: 0x0fc474309f69 <Map(HOLEY_ELEMENTS)>
         183: 0x0fc474309fb1 <Map(HOLEY_ELEMENTS)>
         184: 0x0fc474309ff9 <Map(HOLEY_ELEMENTS)>
         185: 0x0fc423164291 <JSFunction String (sfi = 0xfc48aa53009)>
         186: 0x0fc474306849 <Map(FAST_STRING_WRAPPER_ELEMENTS)>
         187: 0x0fc423168a29 <JSFunction Symbol (sfi = 0xfc48aa558a9)>
     188-195: 0x0fc4c5ec1599 <undefined>
         196: 0x0fc423161251 <JSFunction TypedArray (sfi = 0xfc48aa50889)>
         197: 0x0fc423161809 <Object map = 0xfc474306381>
         198: 0x0fc423168e51 <JSFunction Uint16Array (sfi = 0xfc48aa55a29)>
         199: 0x0fc42316c821 <JSFunction Uint32Array (sfi = 0xfc48aa57959)>
         200: 0x0fc42316b4a1 <JSFunction Uint8Array (sfi = 0xfc48aa56f99)>
         201: 0x0fc42316bf61 <JSFunction Uint8ClampedArray (sfi = 0xfc48aa57581)>
         202: 0x0fc423167a61 <JSFunction entries (sfi = 0xfc48aa552c1)>
         203: 0x0fc423167ad1 <JSFunction forEach (sfi = 0xfc48aa55341)>
         204: 0x0fc423167a29 <JSFunction keys (sfi = 0xfc48aa55281)>
         205: 0x0fc423167a99 <JSFunction values (sfi = 0xfc48aa55301)>
         206: 0x0fc423160d01 <JSFunction Error (sfi = 0xfc48aa50681)>
         207: 0x0fc423160e89 <JSFunction toString (sfi = 0xfc48aa506c1)>
         208: 0x0fc423164019 <JSFunction EvalError (sfi = 0xfc48aa52ec9)>
         209: 0x0fc4c5ec1599 <undefined>
         210: 0x0fc423168451 <JSFunction eval (sfi = 0xfc48aa55641)>
         211: 0x0fc4231762c1 <JSFunction (sfi = 0xfc423176281)>
         212: 0x0fc423166cf1 <JSFunction delete (sfi = 0xfc48aa549c1)>
         213: 0x0fc423166e41 <JSFunction get (sfi = 0xfc48aa54b41)>
         214: 0x0fc423166cb9 <JSFunction has (sfi = 0xfc48aa54981)>
         215: 0x0fc423166e79 <JSFunction set (sfi = 0xfc48aa54b81)>
         216: 0x0fc4c5ec1599 <undefined>
         217: 0x0fc42315dc51 <JSFunction [Symbol.hasInstance] (sfi = 0xfc48aa4db91)>
         218: 0x0fc42315e7d9 <JSFunction toString (sfi = 0xfc48aa4e5b9)>
         219: 0x0fc42315e811 <JSFunction valueOf (sfi = 0xfc48aa4e5f9)>
         220: 0x0fc423165a09 <JSFunction all (sfi = 0xfc48aa54071)>
         221: 0x0fc4c5ec1599 <undefined>
         222: 0x0fc423165c81 <JSFunction catch (sfi = 0xfc48aa54261)>
         223: 0x0fc423165989 <JSFunction Promise (sfi = 0xfc48aa54171)>
         224: 0x0fc42316bce1 <JSFunction RangeError (sfi = 0xfc48aa574e9)>
         225: 0x0fc423160f69 <JSFunction ReferenceError (sfi = 0xfc48aa50701)>
         226: 0x0fc4231663a1 <JSFunction add (sfi = 0xfc48aa54579)>
         227: 0x0fc423166251 <JSFunction delete (sfi = 0xfc48aa543f9)>
         228: 0x0fc423166369 <JSFunction has (sfi = 0xfc48aa54539)>
         229: 0x0fc423162199 <JSFunction SyntaxError (sfi = 0xfc48aa513e9)>
         230: 0x0fc423168069 <JSFunction TypeError (sfi = 0xfc48aa555c1)>
         231: 0x0fc423168271 <JSFunction URIError (sfi = 0xfc48aa55601)>
         232: 0x0fc423175cb1 <JSFunction CompileError (sfi = 0xfc48aa5a319)>
         233: 0x0fc423175e91 <JSFunction LinkError (sfi = 0xfc48aa5a359)>
         234: 0x0fc423176071 <JSFunction RuntimeError (sfi = 0xfc48aa5a399)>
         235: 0x0fc42316b3b1 <JSFunction set (sfi = 0xfc48aa56f59)>
         236: 0x0fc42316b379 <JSFunction get (sfi = 0xfc48aa56f19)>
         237: 0x0fc42316db61 <JSFunction add (sfi = 0xfc48aa588e1)>
         238: 0x0fc4c5ec3099 <Other heap object (WEAK_ARRAY_LIST_TYPE)>
         239: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
     240-242: 0x0fc4c5ec1599 <undefined>
 - microtask_queue: 0x0

0xfc423176259: [JSGlobalObject] in OldSpace
 - map: 0x0fc47430a431 <Map(HOLEY_ELEMENTS)> [DictionaryProperties]
 - prototype: 0x0fc422246d79 <Object map = 0xfc47430a3e9>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - native context: 0x0fc42315cf99 <NativeContext[243]>
 - global proxy: 0x0fc42315cf79 <JSGlobal Object>
 - properties: 0x0fc422246709 <GlobalDictionary[133]> {
   Math: 0x0fc42316cf21 <Object map = 0xfc4743084b1> (data, dict_index: 25, attrs: [W_C])
   decodeURI: 0x0fc42316ca89 <JSFunction decodeURI (sfi = 0xfc48aa57a59)> (data, dict_index: 48, attrs: [W_C])
   encodeURI: 0x0fc4231610f9 <JSFunction encodeURI (sfi = 0xfc48aa50761)> (data, dict_index: 50, attrs: [W_C])
   clearTimeout: 0x0fc4a1818a39 <JSFunction clearTimeout (sfi = 0xfc4d23e7a99)> (data, dict_index: 69, attrs: [WEC])
   globalThis: 0x0fc42315cf79 <JSGlobal Object> (data, dict_index: 23, attrs: [W_C])
   escape: 0x0fc42316be71 <JSFunction escape (sfi = 0xfc48aa57541)> (data, dict_index: 52, attrs: [W_C])
   0x0fc423176c39 <Symbol: node:per_context_binding_exports>: 0x0fc422246b41 <Object map = 0xfc47430e5b9> (data, dict_index: 57, attrs: [W_C])
   ArrayBuffer: 0x0fc42316ded9 <JSFunction ArrayBuffer (sfi = 0xfc48aa58aa1)> (data, dict_index: 28, attrs: [W_C])
   isFinite: 0x0fc4231620c1 <JSFunction isFinite (sfi = 0xfc48aa513a9)> (data, dict_index: 55, attrs: [W_C])
   clearInterval: 0x0fc4a1818ab9 <JSFunction clearInterval (sfi = 0xfc4d23e7b49)> (data, dict_index: 68, attrs: [WEC])
   Proxy: 0x0fc42316c9c9 <JSFunction Proxy (sfi = 0xfc48aa579f9)> (data, dict_index: 46, attrs: [W_C])
   Symbol: 0x0fc423168a29 <JSFunction Symbol (sfi = 0xfc48aa558a9)> (data, dict_index: 12, attrs: [W_C])
   decodeURIComponent: 0x0fc42315eeb9 <JSFunction decodeURIComponent (sfi = 0xfc48aa4e7a1)> (data, dict_index: 49, attrs: [W_C])
   clearImmediate: 0x0fc4a1818b39 <JSFunction clearImmediate (sfi = 0xfc4d23e7bf9)> (data, dict_index: 73, attrs: [WEC])
   Int16Array: 0x0fc423168541 <JSFunction Int16Array (sfi = 0xfc48aa55681)> (data, dict_index: 32, attrs: [W_C])
   NaN: 0x0fc4c5ec1611 <HeapNumber nan> (data, dict_index: 8, attrs: [___])
   global: 0x0fc42315cf79 <JSGlobal Object> (data, dict_index: 58, attrs: [WEC])
   Reflect: 0x0fc42316c3e9 <Object map = 0xfc474308349> (data, dict_index: 47, attrs: [W_C])
   Int32Array: 0x0fc423165701 <JSFunction Int32Array (sfi = 0xfc48aa53f99)> (data, dict_index: 34, attrs: [W_C])
   encodeURIComponent: 0x0fc423162061 <JSFunction encodeURIComponent (sfi = 0xfc48aa51351)> (data, dict_index: 51, attrs: [W_C])
   setTimeout: 0x0fc4a18189f9 <JSFunction setTimeout (sfi = 0xfc4d23e7a41)> (data, dict_index: 71, attrs: [WEC])
   SyntaxError: 0x0fc423162199 <JSFunction SyntaxError (sfi = 0xfc48aa513e9)> (data, dict_index: 20, attrs: [W_C])
   Map: 0x0fc4231669e9 <JSFunction Map (sfi = 0xfc48aa548e9)> (data, dict_index: 41, attrs: [W_C])
   parseFloat: 0x0fc423166401 <JSFunction parseFloat (sfi = 0xfc48aa545d9)> (data, dict_index: 5, attrs: [W_C])
   Date: 0x0fc423162dc1 <JSFunction Date (sfi = 0xfc48aa51dd1)> (data, dict_index: 13, attrs: [W_C])
   Promise: 0x0fc423165989 <JSFunction Promise (sfi = 0xfc48aa54171)> (data, dict_index: 14, attrs: [W_C])
   0x0fc4c5ec5af9 <Symbol: Symbol.toStringTag>: 0x0fc4c5ec4791 <String[6]: #global> (data, dict_index: 60, attrs: [__C])
   BigUint64Array: 0x0fc423165d71 <JSFunction BigUint64Array (sfi = 0xfc48aa542a1)> (data, dict_index: 38, attrs: [W_C])
   Uint8ClampedArray: 0x0fc42316bf61 <JSFunction Uint8ClampedArray (sfi = 0xfc48aa57581)> (data, dict_index: 37, attrs: [W_C])
   TypeError: 0x0fc423168069 <JSFunction TypeError (sfi = 0xfc48aa555c1)> (data, dict_index: 21, attrs: [W_C])
   Object: 0x0fc42315dee1 <JSFunction Object (sfi = 0xfc48aa4e2d1)> (data, dict_index: 1, attrs: [W_C])
   setImmediate: 0x0fc4a1818af9 <JSFunction setImmediate (sfi = 0xfc4d23e7ba1)> (data, dict_index: 74, attrs: [WEC])
   BigInt64Array: 0x0fc42316c139 <JSFunction BigInt64Array (sfi = 0xfc48aa575c1)> (data, dict_index: 39, attrs: [W_C])
   RegExp: 0x0fc4231604c1 <JSFunction RegExp (sfi = 0xfc48aa4ffc1)> (data, dict_index: 15, attrs: [W_C])
   Error: 0x0fc423160d01 <JSFunction Error (sfi = 0xfc48aa50681)> (data, dict_index: 16, attrs: [W_C])
   eval: 0x0fc423168451 <JSFunction eval (sfi = 0xfc48aa55641)> (data, dict_index: 54, attrs: [W_C])
   process: 0x0fc42224acd1 <process map = 0xfc474331dd9> (data, dict_index: 59, attrs: [W_C])
   Intl: 0x0fc4231690b9 <Object map = 0xfc474310221> (data, dict_index: 27, attrs: [W_C])
   Float64Array: 0x0fc423165529 <JSFunction Float64Array (sfi = 0xfc48aa53f59)> (data, dict_index: 36, attrs: [W_C])
   WeakSet: 0x0fc42316d961 <JSFunction WeakSet (sfi = 0xfc48aa58821)> (data, dict_index: 45, attrs: [W_C])
   ReferenceError: 0x0fc423160f69 <JSFunction ReferenceError (sfi = 0xfc48aa50701)> (data, dict_index: 19, attrs: [W_C])
   isNaN: 0x0fc42316d889 <JSFunction isNaN (sfi = 0xfc48aa587e1)> (data, dict_index: 56, attrs: [W_C])
   undefined: 0x0fc4c5ec1599 <undefined> (data, dict_index: 9, attrs: [___])
   setInterval: 0x0fc4a1818a79 <JSFunction setInterval (sfi = 0xfc4d23e7af1)> (data, dict_index: 70, attrs: [WEC])
   unescape: 0x0fc423166ed9 <JSFunction unescape (sfi = 0xfc48aa54bd9)> (data, dict_index: 53, attrs: [W_C])
   Number: 0x0fc42316b7b1 <JSFunction Number (sfi = 0xfc48aa572d1)> (data, dict_index: 4, attrs: [W_C])
   String: 0x0fc423164291 <JSFunction String (sfi = 0xfc48aa53009)> (data, dict_index: 11, attrs: [W_C])
   AbortSignal: 0x0fc4a1818191 <JSFunction AbortSignal (sfi = 0xfc4d23dee71)> (data, dict_index: 67, attrs: [W_C])
   RangeError: 0x0fc42316bce1 <JSFunction RangeError (sfi = 0xfc48aa574e9)> (data, dict_index: 18, attrs: [W_C])
   URIError: 0x0fc423168271 <JSFunction URIError (sfi = 0xfc48aa55601)> (data, dict_index: 22, attrs: [W_C])
   queueMicrotask: 0x0fc4d23d4489 <JSFunction queueMicrotask (sfi = 0xfc4d23ca0e1)> (data, dict_index: 72, attrs: [WEC])
   Buffer: 0x0fc4222581c9 <JSFunction Buffer (sfi = 0xfc4ab0c27c9)> (data, dict_index: 61, attrs: [W_C])
   AbortController: 0x0fc4a18183f9 <JSFunction AbortController (sfi = 0xfc4d23def99)> (data, dict_index: 66, attrs: [W_C])
   parseInt: 0x0fc42316b959 <JSFunction parseInt (sfi = 0xfc48aa57231)> (data, dict_index: 6, attrs: [W_C])
   Set: 0x0fc423165f99 <JSFunction Set (sfi = 0xfc48aa54349)> (data, dict_index: 43, attrs: [W_C])
   TextEncoder: 0x0fc4a18144b1 <JSFunction TextEncoder (sfi = 0xfc4d23dd421)> (data, dict_index: 64, attrs: [W_C])
   Uint8Array: 0x0fc42316b4a1 <JSFunction Uint8Array (sfi = 0xfc48aa56f99)> (data, dict_index: 29, attrs: [W_C])
   WeakMap: 0x0fc42316b161 <JSFunction WeakMap (sfi = 0xfc48aa56e59)> (data, dict_index: 44, attrs: [W_C])
   Infinity: 0x0fc4c5ec30b1 <HeapNumber inf> (data, dict_index: 7, attrs: [___])
   EvalError: 0x0fc423164019 <JSFunction EvalError (sfi = 0xfc48aa52ec9)> (data, dict_index: 17, attrs: [W_C])
   TextDecoder: 0x0fc4a18148d9 <JSFunction TextDecoder (sfi = 0xfc4d23de4e1)> (data, dict_index: 65, attrs: [W_C])
   Int8Array: 0x0fc423168719 <JSFunction Int8Array (sfi = 0xfc48aa556c1)> (data, dict_index: 30, attrs: [W_C])
   Function: 0x0fc42315da31 <JSFunction Function (sfi = 0xfc48aa4da51)> (data, dict_index: 2, attrs: [W_C])
   BigInt: 0x0fc423166639 <JSFunction BigInt (sfi = 0xfc48aa54781)> (data, dict_index: 42, attrs: [W_C])
   Uint32Array: 0x0fc42316c821 <JSFunction Uint32Array (sfi = 0xfc48aa57959)> (data, dict_index: 33, attrs: [W_C])
   URLSearchParams: 0x0fc4a1810121 <JSFunction URLSearchParams (sfi = 0xfc4d23d4fe9)> (data, dict_index: 63, attrs: [W_C])
   URL: 0x0fc4a18102e1 <JSFunction URL (sfi = 0xfc4d23d5099)> (data, dict_index: 62, attrs: [W_C])
   console: 0x0fc4a18071d1 <Object map = 0xfc47432a891> (data, dict_index: 26, attrs: [W_C])
   Uint16Array: 0x0fc423168e51 <JSFunction Uint16Array (sfi = 0xfc48aa55a29)> (data, dict_index: 31, attrs: [W_C])
   Array: 0x0fc423167061 <JSFunction Array (sfi = 0xfc48aa54d59)> (data, dict_index: 3, attrs: [W_C])
   DataView: 0x0fc4231623a1 <JSFunction DataView (sfi = 0xfc48aa51441)> (data, dict_index: 40, attrs: [W_C])
   Boolean: 0x0fc42316dc39 <JSFunction Boolean (sfi = 0xfc48aa58921)> (data, dict_index: 10, attrs: [W_C])
   JSON: 0x0fc4231664c1 <Object map = 0xfc474306cc9> (data, dict_index: 24, attrs: [W_C])
   Float32Array: 0x0fc423161f19 <JSFunction Float32Array (sfi = 0xfc48aa512e9)> (data, dict_index: 35, attrs: [W_C])
 }

0xfc47430a431: [Map]
 - type: JS_GLOBAL_OBJECT_TYPE
 - instance size: 40
 - inobject properties: 0
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 0
 - enum length: invalid
 - dictionary_map
 - may_have_interesting_symbols
 - prototype_map
 - prototype info: 0x0fc4231782b1 <PrototypeInfo>
 - prototype_validity cell: 0x0fc42317bc99 <Cell value= 1>
 - instance descriptors (own) #0: 0x0fc4c5ec1249 <DescriptorArray[0]>
 - prototype: 0x0fc422246d79 <Object map = 0xfc47430a3e9>
 - constructor: 0x0fc423176219 <JSFunction (sfi = 0xfc4231761d9)>
 - dependent code: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

0xfc422246d79: [JS_OBJECT_TYPE] in OldSpace
 - map: 0x0fc47430a3e9 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc42315e669 <Object map = 0xfc474305c79>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - properties: 0x0fc4c5ec2e39 <PropertyArray[0]> {
    0xfc4c5ec42d1: [String] in ReadOnlySpace: #constructor: 0x0fc42315dee1 <JSFunction Object (sfi = 0xfc48aa4e2d1)> (data field 0)
 }

0xfc47430a3e9: [Map]
 - type: JS_OBJECT_TYPE
 - instance size: 56
 - inobject properties: 4
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 3
 - enum length: invalid
 - stable_map
 - prototype_map
 - prototype info: 0x0fc4231782e9 <PrototypeInfo>
 - prototype_validity cell: 0x0fc48aa41659 <Cell value= 1>
 - instance descriptors (own) #1: 0x0fc422246db1 <DescriptorArray[1]>
 - prototype: 0x0fc42315e669 <Object map = 0xfc474305c79>
 - constructor: 0x0fc42315dee1 <JSFunction Object (sfi = 0xfc48aa4e2d1)>
 - dependent code: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

0xfc42315e669: [JS_OBJECT_TYPE] in OldSpace
 - map: 0x0fc474305c79 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc4c5ec1319 <null>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - properties: 0x0fc42315e6a1 <PropertyArray[9]> {
    0xfc4c5ec42d1: [String] in ReadOnlySpace: #constructor: 0x0fc42315dee1 <JSFunction Object (sfi = 0xfc48aa4e2d1)> (data field 0)
    0xfc48aa4e311: [String] in OldSpace: #__defineGetter__: 0x0fc42315e881 <JSFunction __defineGetter__ (sfi = 0xfc48aa4e679)> (const data field 1)
    0xfc48aa4e331: [String] in OldSpace: #__defineSetter__: 0x0fc42315e8b9 <JSFunction __defineSetter__ (sfi = 0xfc48aa4e6b9)> (const data field 2)
    0xfc48aa4e351: [String] in OldSpace: #hasOwnProperty: 0x0fc42315e8f1 <JSFunction hasOwnProperty (sfi = 0xfc48aa4e6f9)> (const data field 3)
    0xfc48aa4e371: [String] in OldSpace: #__lookupGetter__: 0x0fc42315e6f9 <JSFunction __lookupGetter__ (sfi = 0xfc48aa4e4b9)> (const data field 4) properties[0]
    0xfc48aa4e391: [String] in OldSpace: #__lookupSetter__: 0x0fc42315e731 <JSFunction __lookupSetter__ (sfi = 0xfc48aa4e4f9)> (const data field 5) properties[1]
    0xfc48aa4e3b1: [String] in OldSpace: #isPrototypeOf: 0x0fc42315e769 <JSFunction isPrototypeOf (sfi = 0xfc48aa4e539)> (const data field 6) properties[2]
    0xfc48aa4e3d1: [String] in OldSpace: #propertyIsEnumerable: 0x0fc42315e7a1 <JSFunction propertyIsEnumerable (sfi = 0xfc48aa4e579)> (const data field 7) properties[3]
    0xfc4c5ec52a1: [String] in ReadOnlySpace: #toString: 0x0fc42315e7d9 <JSFunction toString (sfi = 0xfc48aa4e5b9)> (const data field 8) properties[4]
    0xfc4c5ec53e9: [String] in ReadOnlySpace: #valueOf: 0x0fc42315e811 <JSFunction valueOf (sfi = 0xfc48aa4e5f9)> (const data field 9) properties[5]
    0xfc4c5ec4de9: [String] in ReadOnlySpace: #__proto__: 0x0fc42315e5a9 <AccessorPair> (const accessor descriptor)
    0xfc43ad152e9: [String] in ReadOnlySpace: #toLocaleString: 0x0fc42315e849 <JSFunction toLocaleString (sfi = 0xfc48aa4e639)> (const data field 10) properties[6]
 }

0xfc474305c79: [Map]
 - type: JS_OBJECT_TYPE
 - instance size: 56
 - inobject properties: 4
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 2
 - enum length: invalid
 - stable_map
 - prototype_map
 - prototype info: 0x0fc42315e631 <PrototypeInfo>
 - prototype_validity cell: 0x0fc423176cb9 <Cell value= 1>
 - instance descriptors (own) #12: 0x0fc42315e471 <DescriptorArray[12]>
 - prototype: 0x0fc4c5ec1319 <null>
 - constructor: 0x0fc42315dee1 <JSFunction Object (sfi = 0xfc48aa4e2d1)>
 - dependent code: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

0xfc42315dee1: [Function] in OldSpace
 - map: 0x0fc474305cc1 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - function prototype: 0x0fc42315e669 <Object map = 0xfc474305c79>
 - initial_map: 0x0fc474305e71 <Map(HOLEY_ELEMENTS)>
 - shared_info: 0x0fc48aa4e2d1 <SharedFunctionInfo Object>
 - name: 0x0fc4c5ec4ca9 <String[6]: #Object>
 - builtin: ObjectConstructor
 - formal_parameter_count: 65535
 - kind: NormalFunction
 - context: 0x0fc42315cf99 <NativeContext[243]>
 - code: 0x20e18df4fda1 <Code BUILTIN ObjectConstructor>
 - properties: 0x0fc42315df21 <PropertyArray[21]> {
    0xfc4c5ec49c9: [String] in ReadOnlySpace: #length: 0x0fc48aa41499 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec4b21: [String] in ReadOnlySpace: #name: 0x0fc48aa41429 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec4e09: [String] in ReadOnlySpace: #prototype: 0x0fc48aa41509 <AccessorInfo> (const accessor descriptor)
    0xfc48aa4dbf9: [String] in OldSpace: #assign: 0x0fc42315dfd9 <JSFunction assign (sfi = 0xfc48aa4dd91)> (data field 0) properties[0]
    0xfc4c5ec4749: [String] in ReadOnlySpace: #getOwnPropertyDescriptor: 0x0fc42315e011 <JSFunction getOwnPropertyDescriptor (sfi = 0xfc48aa4ddd1)> (data field 1) properties[1]
    0xfc48aa4dc11: [String] in OldSpace: #getOwnPropertyDescriptors: 0x0fc42315e049 <JSFunction getOwnPropertyDescriptors (sfi = 0xfc48aa4de11)> (data field 2) properties[2]
    0xfc48aa4dc41: [String] in OldSpace: #getOwnPropertyNames: 0x0fc42315e081 <JSFunction getOwnPropertyNames (sfi = 0xfc48aa4de51)> (data field 3) properties[3]
    0xfc48aa4dc69: [String] in OldSpace: #getOwnPropertySymbols: 0x0fc42315e0b9 <JSFunction getOwnPropertySymbols (sfi = 0xfc48aa4de91)> (data field 4) properties[4]
    0xfc48aa4dc91: [String] in OldSpace: #is: 0x0fc42315e0f1 <JSFunction is (sfi = 0xfc48aa4ded1)> (data field 5) properties[5]
    0xfc4c5ec4d89: [String] in ReadOnlySpace: #preventExtensions: 0x0fc42315e129 <JSFunction preventExtensions (sfi = 0xfc48aa4df11)> (data field 6) properties[6]
    0xfc48aa4dca9: [String] in OldSpace: #seal: 0x0fc42315e161 <JSFunction seal (sfi = 0xfc48aa4df51)> (data field 7) properties[7]
    0xfc48aa4dcc1: [String] in OldSpace: #create: 0x0fc42315e199 <JSFunction create (sfi = 0xfc48aa4df91)> (data field 8) properties[8]
    0xfc48aa4dcd9: [String] in OldSpace: #defineProperties: 0x0fc42315e1d1 <JSFunction defineProperties (sfi = 0xfc48aa4dfd1)> (data field 9) properties[9]
    0xfc4c5ec4359: [String] in ReadOnlySpace: #defineProperty: 0x0fc42315e209 <JSFunction defineProperty (sfi = 0xfc48aa4e011)> (data field 10) properties[10]
    0xfc48aa4dcf9: [String] in OldSpace: #freeze: 0x0fc42315e241 <JSFunction freeze (sfi = 0xfc48aa4e051)> (data field 11) properties[11]
    0xfc4c5ec4771: [String] in ReadOnlySpace: #getPrototypeOf: 0x0fc42315e279 <JSFunction getPrototypeOf (sfi = 0xfc48aa4e091)> (data field 12) properties[12]
    0xfc4c5ec5071: [String] in ReadOnlySpace: #setPrototypeOf: 0x0fc42315e2b1 <JSFunction setPrototypeOf (sfi = 0xfc48aa4e0d1)> (data field 13) properties[13]
    0xfc4c5ec4931: [String] in ReadOnlySpace: #isExtensible: 0x0fc42315e2e9 <JSFunction isExtensible (sfi = 0xfc48aa4e111)> (data field 14) properties[14]
    0xfc48aa4dd11: [String] in OldSpace: #isFrozen: 0x0fc42315e321 <JSFunction isFrozen (sfi = 0xfc48aa4e151)> (data field 15) properties[15]
    0xfc48aa4dd29: [String] in OldSpace: #isSealed: 0x0fc42315e359 <JSFunction isSealed (sfi = 0xfc48aa4e191)> (data field 16) properties[16]
    0xfc4c5ec4991: [String] in ReadOnlySpace: #keys: 0x0fc42315e391 <JSFunction keys (sfi = 0xfc48aa4e1d1)> (data field 17) properties[17]
    0xfc48aa4dd41: [String] in OldSpace: #entries: 0x0fc42315e3c9 <JSFunction entries (sfi = 0xfc48aa4e211)> (data field 18) properties[18]
    0xfc48aa4dd59: [String] in OldSpace: #fromEntries: 0x0fc42315e401 <JSFunction fromEntries (sfi = 0xfc48aa4e251)> (data field 19) properties[19]
    0xfc48aa4dd79: [String] in OldSpace: #values: 0x0fc42315e439 <JSFunction values (sfi = 0xfc48aa4e291)> (data field 20) properties[20]
 }
 - feedback vector: feedback metadata is not available in SFI

0xfc474305cc1: [Map]
 - type: JS_FUNCTION_TYPE
 - instance size: 64
 - inobject properties: 0
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 0
 - enum length: invalid
 - stable_map
 - callable
 - constructor
 - has_prototype_slot
 - back pointer: 0x0fc4c5ec1599 <undefined>
 - prototype_validity cell: 0x0fc48aa41659 <Cell value= 1>
 - instance descriptors (own) #24: 0x0fc42315dc89 <DescriptorArray[24]>
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - constructor: 0x0fc4c5ec1319 <null>
 - dependent code: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

0xfc42315d941: [Function] in OldSpace
 - map: 0x0fc474305d09 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc42315e669 <Object map = 0xfc474305c79>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - function prototype: <no-prototype-slot>
 - shared_info: 0x0fc48aa4d8a1 <SharedFunctionInfo>
 - name: 0x0fc4c5ec17b1 <String[0]: #>
 - builtin: EmptyFunction
 - formal_parameter_count: 65535
 - kind: NormalFunction
 - context: 0x0fc42315cf99 <NativeContext[243]>
 - code: 0x20e18df44a21 <Code BUILTIN EmptyFunction>
 - source code: 
 - properties: 0x0fc42315d979 <PropertyArray[6]> {
    0xfc4c5ec49c9: [String] in ReadOnlySpace: #length: 0x0fc48aa41499 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec4b21: [String] in ReadOnlySpace: #name: 0x0fc48aa41429 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec3f41: [String] in ReadOnlySpace: #arguments: 0x0fc42315d851 <AccessorPair> (const accessor descriptor)
    0xfc4c5ec41c9: [String] in ReadOnlySpace: #caller: 0x0fc42315d851 <AccessorPair> (const accessor descriptor)
    0xfc4c5ec42d1: [String] in ReadOnlySpace: #constructor: 0x0fc42315da31 <JSFunction Function (sfi = 0xfc48aa4da51)> (const data field 0) properties[0]
    0xfc4c5ec3f09: [String] in ReadOnlySpace: #apply: 0x0fc42315db71 <JSFunction apply (sfi = 0xfc48aa4da91)> (const data field 1) properties[1]
    0xfc4c5ec40d1: [String] in ReadOnlySpace: #bind: 0x0fc42315dba9 <JSFunction bind (sfi = 0xfc48aa4dad1)> (const data field 2) properties[2]
    0xfc48aa4da39: [String] in OldSpace: #call: 0x0fc42315dbe1 <JSFunction call (sfi = 0xfc48aa4db11)> (const data field 3) properties[3]
    0xfc4c5ec52a1: [String] in ReadOnlySpace: #toString: 0x0fc42315dc19 <JSFunction toString (sfi = 0xfc48aa4db51)> (const data field 4) properties[4]
    0x0fc4c5ec5a71 <Symbol: Symbol.hasInstance>: 0x0fc42315dc51 <JSFunction [Symbol.hasInstance] (sfi = 0xfc48aa4db91)> (const data field 5) properties[5]
 }
 - feedback vector: feedback metadata is not available in SFI

0xfc474305d09: [Map]
 - type: JS_FUNCTION_TYPE
 - instance size: 56
 - inobject properties: 0
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 0
 - enum length: invalid
 - stable_map
 - callable
 - prototype_map
 - prototype info: 0x0fc42315d909 <PrototypeInfo>
 - prototype_validity cell: 0x0fc4a182e2f1 <Cell value= 0>
 - instance descriptors (own) #10: 0x0fc42315d749 <DescriptorArray[10]>
 - prototype: 0x0fc42315e669 <Object map = 0xfc474305c79>
 - constructor: 0x0fc4c5ec1319 <null>
 - dependent code: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

0xfc42315d909: [PrototypeInfo] in OldSpace
 - map: 0x0fc4c5ec61f9 <Map[56]>
 - module namespace: 0x0fc4c5ec1599 <undefined>
 - prototype users: 0x0fc42224a2c9 <Other heap object (WEAK_ARRAY_LIST_TYPE)>
 - registry slot: 9
 - object create map: 0x0fc4c5ec1599 <undefined>
 - should_be_fast_map: 1

0xfc42224a2c9: [WeakArrayList] in OldSpace
 - map: 0x0fc4c5ec2851 <Map>
 - capacity: 4
 - length: 2

           0: 0
           1: [weak] 0x0fc4743062f1 <Map(HOLEY_ELEMENTS)>

0xfc4743062f1: [Map]
 - type: JS_FUNCTION_TYPE
 - instance size: 64
 - inobject properties: 0
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 1
 - enum length: invalid
 - stable_map
 - callable
 - constructor
 - has_prototype_slot
 - prototype_map
 - prototype info: 0x0fc42317dc19 <PrototypeInfo>
 - prototype_validity cell: 0x0fc48aa41659 <Cell value= 1>
 - instance descriptors (own) #6: 0x0fc423161159 <DescriptorArray[6]>
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - constructor: 0x0fc42315dee1 <JSFunction Object (sfi = 0xfc48aa4e2d1)>
 - dependent code: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

0xfc423161159: [DescriptorArray] in OldSpace
 - map: 0x0fc4c5ec11a9 <Map>
 - enum_cache: empty
 - nof slack descriptors: 0
 - nof descriptors: 6
 - raw marked descriptors: mc epoch 1, marked 6
  [0]: 0xfc4c5ec49c9: [String] in ReadOnlySpace: #length (const accessor descriptor, p: 1, attrs: [__C]) @ 0x0fc48aa41499 <AccessorInfo>
  [1]: 0xfc4c5ec4b21: [String] in ReadOnlySpace: #name (const accessor descriptor, p: 5, attrs: [__C]) @ 0x0fc48aa41429 <AccessorInfo>
  [2]: 0xfc4c5ec4e09: [String] in ReadOnlySpace: #prototype (const accessor descriptor, p: 0, attrs: [___]) @ 0x0fc48aa41509 <AccessorInfo>
  [3]: 0x0fc4c5ec5981 <Symbol: Symbol.species> (const accessor descriptor, p: 2, attrs: [W_C]) @ 0x0fc423161201 <AccessorPair>(get: 0x0fc423161219 <JSFunction get [Symbol.species] (sfi = 0xfc48aa507a1)>, set: 0x0fc4c5ec1599 <undefined>)
  [4]: 0xfc4c5ec4ce1: [String] in ReadOnlySpace: #of (data field 0:t, p: 3, attrs: [W_C]) @ Any
  [5]: 0xfc4c5ec4659: [String] in ReadOnlySpace: #from (data field 1:t, p: 4, attrs: [W_C]) @ Any

0xfc423161201: [AccessorPair] in OldSpace
 - map: 0x0fc4c5ec5dc1 <Map[24]>
 - getter: 0x0fc423161219 <JSFunction get [Symbol.species] (sfi = 0xfc48aa507a1)>
 - setter: 0x0fc4c5ec1599 <undefined>

0xfc423161219: [Function] in OldSpace
 - map: 0x0fc474305e29 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - function prototype: <no-prototype-slot>
 - shared_info: 0x0fc48aa507a1 <SharedFunctionInfo get [Symbol.species]>
 - name: 0x0fc48aa507e1 <String[20]: "get [Symbol.species]">
 - builtin: ReturnReceiver
 - formal_parameter_count: 0
 - kind: NormalFunction
 - context: 0x0fc42315cf99 <NativeContext[243]>
 - code: 0x20e18df44c21 <Code BUILTIN ReturnReceiver>
 - properties: 0x0fc4c5ec1309 <FixedArray[0]> {
    0xfc4c5ec49c9: [String] in ReadOnlySpace: #length: 0x0fc48aa41499 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec4b21: [String] in ReadOnlySpace: #name: 0x0fc48aa41429 <AccessorInfo> (const accessor descriptor)
 }
 - feedback vector: feedback metadata is not available in SFI

0xfc474305e29: [Map]
 - type: JS_FUNCTION_TYPE
 - instance size: 56
 - inobject properties: 0
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 0
 - enum length: invalid
 - callable
 - back pointer: 0x0fc4c5ec1599 <undefined>
 - prototype_validity cell: 0x0fc48aa41659 <Cell value= 1>
 - instance descriptors (own) #2: 0x0fc42315db29 <DescriptorArray[2]>
 - transitions #1: 0x0fc47432f289 <Map(HOLEY_ELEMENTS)>
     0xfc4d23e5c09: [String] in OldSpace: #enabled: (transition to (const accessor descriptor, attrs: [WEC]) @ 0x0fc422243239 <AccessorPair>(get: 0x0fc4a181a061 <JSFunction get (sfi = 0xfc422242f59)>, set: 0x0fc4c5ec1319 <null>)) -> 0x0fc47432f289 <Map(HOLEY_ELEMENTS)>
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - constructor: 0x0fc4c5ec1319 <null>
 - dependent code: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

0xfc47432f289: [Map]
 - type: JS_FUNCTION_TYPE
 - instance size: 56
 - inobject properties: 0
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 0
 - enum length: invalid
 - stable_map
 - callable
 - back pointer: 0x0fc474305e29 <Map(HOLEY_ELEMENTS)>
 - prototype_validity cell: 0x0fc48aa41659 <Cell value= 1>
 - instance descriptors (own) #3: 0x0fc4a181a099 <DescriptorArray[3]>
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - constructor: 0x0fc4c5ec1319 <null>
 - dependent code: 0x0fc4c5ec1239 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

0xfc4a181a099: [DescriptorArray] in OldSpace
 - map: 0x0fc4c5ec11a9 <Map>
 - enum_cache: empty
 - nof slack descriptors: 0
 - nof descriptors: 3
 - raw marked descriptors: mc epoch 1, marked 3
  [0]: 0xfc4c5ec49c9: [String] in ReadOnlySpace: #length (const accessor descriptor, p: 1, attrs: [__C]) @ 0x0fc48aa41499 <AccessorInfo>
  [1]: 0xfc4c5ec4b21: [String] in ReadOnlySpace: #name (const accessor descriptor, p: 0, attrs: [__C]) @ 0x0fc48aa41429 <AccessorInfo>
  [2]: 0xfc4d23e5c09: [String] in OldSpace: #enabled (const accessor descriptor, p: 2, attrs: [WEC]) @ 0x0fc422243239 <AccessorPair>(get: 0x0fc4a181a061 <JSFunction get (sfi = 0xfc422242f59)>, set: 0x0fc4c5ec1319 <null>)

0xfc422243239: [AccessorPair] in OldSpace
 - map: 0x0fc4c5ec5dc1 <Map[24]>
 - getter: 0x0fc4a181a061 <JSFunction get (sfi = 0xfc422242f59)>
 - setter: 0x0fc4c5ec1319 <null>

0xfc4a181a061: [Function] in OldSpace
 - map: 0x0fc474305e29 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - function prototype: <no-prototype-slot>
 - shared_info: 0x0fc422242f59 <SharedFunctionInfo get>
 - name: 0x0fc4c5ec4731 <String[3]: #get>
 - builtin: CompileLazy
 - formal_parameter_count: 0
 - kind: ConciseMethod
 - context: 0x0fc4a1819f29 <FunctionContext[8]>
 - code: 0x20e18df446a1 <Code BUILTIN CompileLazy>
 - source code: () {
      return test();
    }
 - properties: 0x0fc4c5ec1309 <FixedArray[0]> {
    0xfc4c5ec49c9: [String] in ReadOnlySpace: #length: 0x0fc48aa41499 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec4b21: [String] in ReadOnlySpace: #name: 0x0fc48aa41429 <AccessorInfo> (const accessor descriptor)
 }
 - feedback vector: feedback metadata is not available in SFI

0xfc4a1819f29: [Context] in OldSpace
 - map: 0x0fc474309309 <Map>
 - length: 8
 - scope_info: 0x0fc422242d41 <ScopeInfo FUNCTION_SCOPE [21]>
 - previous: 0x0fc4a1815bf1 <FunctionContext[18]>
 - native_context: 0x0fc42315cf99 <NativeContext[243]>
           0: 0x0fc422242d41 <ScopeInfo FUNCTION_SCOPE [21]>
           1: 0x0fc4a1815bf1 <FunctionContext[18]>
           2: 0x0fc4a1819ef1 <JSFunction (sfi = 0xfc4d23ea4c1)>
           3: 0x0fc4d23e72c9 <String[5]: #timer>
           4: 0x0fc4a1819f79 <JSFunction init (sfi = 0xfc422242df9)>
           5: 0x0fc4a1819fb9 <JSFunction debug (sfi = 0xfc422242e51)>
           6: 0x0fc4c5ec1599 <undefined>
           7: 0x0fc4a1819ff1 <JSFunction test (sfi = 0xfc422242ea9)>

0xfc4a1815bf1: [Context] in OldSpace
 - map: 0x0fc474309309 <Map>
 - length: 18
 - scope_info: 0x0fc4d23e5d11 <ScopeInfo FUNCTION_SCOPE [40]>
 - previous: 0x0fc42315cf99 <NativeContext[243]>
 - native_context: 0x0fc42315cf99 <NativeContext[243]>
           0: 0x0fc4d23e5d11 <ScopeInfo FUNCTION_SCOPE [40]>
           1: 0x0fc42315cf99 <NativeContext[243]>
           2: 0x0fc42224acd1 <process map = 0xfc474331dd9>
           3: 0x0fc42226d6a9 <JSFunction (sfi = 0xfc4a18200d9)>
           4: 0x0fc42315e199 <JSFunction create (sfi = 0xfc48aa4df91)>
           5: 0x0fc42315e209 <JSFunction defineProperty (sfi = 0xfc48aa4e011)>
           6: 0x0fc4231604c1 <JSFunction RegExp (sfi = 0xfc48aa4ffc1)>
           7: 0x0fc42226b781 <JSFunction (sfi = 0xfc4a18200d9)>
           8: 0x0fc42226d159 <JSFunction (sfi = 0xfc4a18200d9)>
           9: 0x0fc42224b1a1 <JSFunction inspect (sfi = 0xfc4a183b2b9)>
          10: 0x0fc42227db49 <JSFunction format (sfi = 0xfc4a183c1d9)>
          11: 0x0fc42227db89 <JSFunction formatWithOptions (sfi = 0xfc4a183c231)>
          12: 0x0fc4c5ec1599 <undefined>
          13: 0x0fc4a1815dd1 <JSRegExp <String[2]: #^$>>
          14: 0x0fc4c5ec1599 <undefined>
          15: 0x0fc4a1815cd1 <JSFunction emitWarningIfNeeded (sfi = 0xfc4d23e5fc9)>
          16: 0x0fc4a1815d11 <JSFunction noop (sfi = 0xfc4d23e6021)>
          17: 0x0fc4a1815d51 <JSFunction debuglogImpl (sfi = 0xfc4d23e6079)>

0xfc42224acd1: [JS_API_OBJECT_TYPE] in OldSpace
 - map: 0x0fc474331dd9 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc4222504a1 <Object map = 0xfc47431dee9>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - properties: 0x0fc4a181dd51 <PropertyArray[57]> {
    0xfc423142b59: [String] in OldSpace: #version: 0x0fc42226db79 <String[11]: "v15.0.0-pre"> (const data field 0) properties[0]
    0xfc4a1821eb1: [String] in OldSpace: #versions: 0x0fc42226db99 <Object map = 0xfc474310809> (const data field 1) properties[1]
    0xfc4a1822001: [String] in OldSpace: #arch: 0x0fc42226dbd1 <String[3]: "x64"> (const data field 2) properties[2]
    0xfc4a1822019: [String] in OldSpace: #platform: 0x0fc42226dbe9 <String[6]: "darwin"> (const data field 3) properties[3]
    0xfc4a1822031: [String] in OldSpace: #release: 0x0fc42226dc01 <Object map = 0xfc474310929> (const data field 4) properties[4]
    0xfc4a1822151: [String] in OldSpace: #_rawDebug: 0x0fc4d23e22a9 <JSFunction _rawDebug (sfi = 0xfc4d23c4741)> (data field 5) properties[5]
    0xfc4a18224c1: [String] in OldSpace: #moduleLoadList: 0x0fc422268281 <JSArray[53]> (const data field 6) properties[6]
    0xfc4a1822781: [String] in OldSpace: #binding: 0x0fc4a18234e1 <JSFunction binding (sfi = 0xfc4a1822dc9)> (const data field 7) properties[7]
    0xfc4a1822799: [String] in OldSpace: #_linkedBinding: 0x0fc4a1823531 <JSFunction _linkedBinding (sfi = 0xfc4a1822e21)> (const data field 8) properties[8]
    0xfc4a18368b1: [String] in OldSpace: #_events: 0x0fc42226dc39 <Object map = 0xfc474309aa1> (const data field 9) properties[9]
    0xfc4a18368c9: [String] in OldSpace: #_eventsCount: 2 (data field 10) properties[10]
    0xfc4a18368e9: [String] in OldSpace: #_maxListeners: 0x0fc4c5ec1599 <undefined> (const data field 11) properties[11]
    0x0fc4a183f809 <Symbol: kCapture>: 0x0fc4c5ec1769 <false> (const data field 12) properties[12]
    0x0fc4c5ec5af9 <Symbol: Symbol.toStringTag>: 0x0fc4231425c1 <String[7]: #process> (const data field 13) properties[13]
    0xfc4a1824179: [String] in OldSpace: #domain: 0x0fc4c5ec1319 <null> (const data field 14) properties[14]
    0xfc4a1824191: [String] in OldSpace: #_exiting: 0x0fc4c5ec1769 <false> (const data field 15) properties[15]
    0xfc423141861: [String] in OldSpace: #config: 0x0fc4d23d9559 <Object map = 0xfc474321a89> (const data field 16) properties[16]
    0xfc4a1824221: [String] in OldSpace: #dlopen: 0x0fc4d23c41b9 <JSFunction dlopen (sfi = 0xfc4d23c4179)> (const data field 17) properties[17]
    0xfc4a1824239: [String] in OldSpace: #uptime: 0x0fc4d23c43c9 <JSFunction uptime (sfi = 0xfc4d23c4389)> (const data field 18) properties[18]
    0xfc4a1824251: [String] in OldSpace: #_getActiveRequests: 0x0fc4d23c3d99 <JSFunction _getActiveRequests (sfi = 0xfc4d23c3d59)> (const data field 19) properties[19]
    0xfc4a1824279: [String] in OldSpace: #_getActiveHandles: 0x0fc4d23c3ea1 <JSFunction _getActiveHandles (sfi = 0xfc4d23c3e61)> (const data field 20) properties[20]
    0xfc4a18242a1: [String] in OldSpace: #reallyExit: 0x0fc4d23c42c1 <JSFunction reallyExit (sfi = 0xfc4d23c4281)> (const data field 21) properties[21]
    0xfc4a18242c1: [String] in OldSpace: #_kill: 0x0fc4d23c3fa9 <JSFunction _kill (sfi = 0xfc4d23c3f69)> (const data field 22) properties[22]
    0xfc4a1824301: [String] in OldSpace: #cpuUsage: 0x0fc4d23e22e9 <JSFunction cpuUsage (sfi = 0xfc4d23c4799)> (const data field 23) properties[23]
    0xfc4a1824319: [String] in OldSpace: #resourceUsage: 0x0fc4d23e2429 <JSFunction resourceUsage (sfi = 0xfc4d23c4951)> (const data field 24) properties[24]
    0xfc4a1824339: [String] in OldSpace: #memoryUsage: 0x0fc4d23e2369 <JSFunction memoryUsage (sfi = 0xfc4d23c4849)> (const data field 25) properties[25]
    0xfc4a1824359: [String] in OldSpace: #kill: 0x0fc4d23e23e9 <JSFunction kill (sfi = 0xfc4d23c48f9)> (const data field 26) properties[26]
    0xfc4a1824371: [String] in OldSpace: #exit: 0x0fc4d23e23a9 <JSFunction exit (sfi = 0xfc4d23c48a1)> (const data field 27) properties[27]
    0xfc4a1824389: [String] in OldSpace: #openStdin: 0x0fc4d23c4d19 <JSFunction process.openStdin (sfi = 0xfc4a1824d31)> (const data field 28) properties[28]
    0xfc4a18243f9: [String] in OldSpace: #getuid: 0x0fc4d23c4f51 <JSFunction getuid (sfi = 0xfc4d23c4f11)> (const data field 29) properties[29]
    0xfc4a1824411: [String] in OldSpace: #geteuid: 0x0fc4d23c5059 <JSFunction geteuid (sfi = 0xfc4d23c5019)> (const data field 30) properties[30]
    0xfc4a1824429: [String] in OldSpace: #getgid: 0x0fc4d23c5161 <JSFunction getgid (sfi = 0xfc4d23c5121)> (const data field 31) properties[31]
    0xfc4a1824441: [String] in OldSpace: #getegid: 0x0fc4d23c5269 <JSFunction getegid (sfi = 0xfc4d23c5229)> (const data field 32) properties[32]
    0xfc4a1824459: [String] in OldSpace: #getgroups: 0x0fc4d23c5371 <JSFunction getgroups (sfi = 0xfc4d23c5331)> (const data field 33) properties[33]
    0xfc4a1824729: [String] in OldSpace: #allowedNodeEnvironmentFlags: 0x0fc422244011 <AccessorPair> (const accessor descriptor)
    0xfc48aa4e999: [String] in OldSpace: #assert: 0x0fc4a181be99 <JSFunction deprecated (sfi = 0xfc422243a09)> (const data field 34) properties[34]
    0xfc4a1824829: [String] in OldSpace: #features: 0x0fc4a181c069 <Object map = 0xfc474330f39> (const data field 35) properties[35]
    0xfc423141cd9: [String] in OldSpace: #_fatalException: 0x0fc4a181c749 <JSFunction (sfi = 0xfc422245209)> (const data field 36) properties[36]
    0xfc4a1824909: [String] in OldSpace: #setUncaughtExceptionCaptureCallback: 0x0fc4a181c4e9 <JSFunction setUncaughtExceptionCaptureCallback (sfi = 0xfc4222449f9)> (const data field 37) properties[37]
    0xfc4a1824941: [String] in OldSpace: #hasUncaughtExceptionCaptureCallback: 0x0fc4a181c529 <JSFunction hasUncaughtExceptionCaptureCallback (sfi = 0xfc422244a51)> (const data field 38) properties[38]
    0xfc423141b61: [String] in OldSpace: #emitWarning: 0x0fc4a181ca99 <JSFunction emitWarning (sfi = 0xfc422245a49)> (const data field 39) properties[39]
    0xfc4a1824979: [String] in OldSpace: #nextTick: 0x0fc4d23d64e1 <JSFunction nextTick (sfi = 0xfc4d23c9fd9)> (const data field 40) properties[40]
    0xfc4a18249b1: [String] in OldSpace: #_tickCallback: 0x0fc4d23e4ff1 <JSFunction runNextTicks (sfi = 0xfc4d23c9f29)> (const data field 41) properties[41]
    0xfc4d23c32d9: [String] in OldSpace: #_debugProcess: 0x0fc4d23c32a1 <JSFunction _debugProcess (sfi = 0xfc4d23c3261)> (const data field 42) properties[42]
    0xfc4d23c3401: [String] in OldSpace: #_debugEnd: 0x0fc4d23c33c9 <JSFunction _debugEnd (sfi = 0xfc4d23c3389)> (const data field 43) properties[43]
    0xfc422247131: [String] in OldSpace: #_startProfilerIdleNotifier: 0x0fc422248121 <JSFunction process._startProfilerIdleNotifier (sfi = 0xfc422247b29)> (const data field 44) properties[44]
    0xfc422247161: [String] in OldSpace: #_stopProfilerIdleNotifier: 0x0fc422248159 <JSFunction process._stopProfilerIdleNotifier (sfi = 0xfc422247bc1)> (const data field 45) properties[45]
    0xfc4d23cc4d1: [String] in OldSpace: #stdout: 0x0fc422248339 <AccessorPair> (const accessor descriptor)
    0xfc4222471e9: [String] in OldSpace: #stdin: 0x0fc422248351 <AccessorPair> (const accessor descriptor)
    0xfc4d23cc4e9: [String] in OldSpace: #stderr: 0x0fc422248369 <AccessorPair> (const accessor descriptor)
    0xfc4d23c3529: [String] in OldSpace: #abort: 0x0fc4d23c34f1 <JSFunction abort (sfi = 0xfc4d23c34b1)> (const data field 46) properties[46]
    0xfc4d23c3891: [String] in OldSpace: #umask: 0x0fc4a181d3f9 <JSFunction wrappedUmask (sfi = 0xfc42224a381)> (const data field 47) properties[47]
    0xfc4d23c3771: [String] in OldSpace: #chdir: 0x0fc4a181d3b9 <JSFunction wrappedChdir (sfi = 0xfc42224a329)> (const data field 48) properties[48]
    0xfc423141971: [String] in OldSpace: #cwd: 0x0fc4a181d439 <JSFunction wrappedCwd (sfi = 0xfc42224a3d9)> (const data field 49) properties[49]
    0xfc4d23c54b1: [String] in OldSpace: #initgroups: 0x0fc4a181dad1 <JSFunction initgroups (sfi = 0xfc42224a831)> (const data field 50) properties[50]
    0xfc4d23c5a59: [String] in OldSpace: #setgroups: 0x0fc4a181db11 <JSFunction setgroups (sfi = 0xfc42224a889)> (const data field 51) properties[51]
    0xfc4d23c55d9: [String] in OldSpace: #setegid: 0x0fc4a181dbc1 <JSFunction (sfi = 0xfc42224ad79)> (const data field 52) properties[52]
    0xfc4d23c56f9: [String] in OldSpace: #seteuid: 0x0fc4a181dc31 <JSFunction (sfi = 0xfc42224ad79)> (const data field 53) properties[53]
    0xfc4d23c5819: [String] in OldSpace: #setgid: 0x0fc4a181dca1 <JSFunction (sfi = 0xfc42224ad79)> (const data field 54) properties[54]
    0xfc4d23c5939: [String] in OldSpace: #setuid: 0x0fc4a181dd11 <JSFunction (sfi = 0xfc42224ad79)> (const data field 55) properties[55]
    0xfc42224b081: [String] in OldSpace: #env: 0x0fc4a181e061 <JSObject> (const data field 56) properties[56]
 }

0xfc4a181dd51: [PropertyArray] in OldSpace
 - map: 0x0fc4c5ec24a9 <Map>
 - length: 57
 - hash: 0
           0: 0x0fc42226db79 <String[11]: "v15.0.0-pre">
           1: 0x0fc42226db99 <Object map = 0xfc474310809>
           2: 0x0fc42226dbd1 <String[3]: "x64">
           3: 0x0fc42226dbe9 <String[6]: "darwin">
           4: 0x0fc42226dc01 <Object map = 0xfc474310929>
           5: 0x0fc4d23e22a9 <JSFunction _rawDebug (sfi = 0xfc4d23c4741)>
           6: 0x0fc422268281 <JSArray[53]>
           7: 0x0fc4a18234e1 <JSFunction binding (sfi = 0xfc4a1822dc9)>
           8: 0x0fc4a1823531 <JSFunction _linkedBinding (sfi = 0xfc4a1822e21)>
           9: 0x0fc42226dc39 <Object map = 0xfc474309aa1>
          10: 2
          11: 0x0fc4c5ec1599 <undefined>
          12: 0x0fc4c5ec1769 <false>
          13: 0x0fc4231425c1 <String[7]: #process>
          14: 0x0fc4c5ec1319 <null>
          15: 0x0fc4c5ec1769 <false>
          16: 0x0fc4d23d9559 <Object map = 0xfc474321a89>
          17: 0x0fc4d23c41b9 <JSFunction dlopen (sfi = 0xfc4d23c4179)>
          18: 0x0fc4d23c43c9 <JSFunction uptime (sfi = 0xfc4d23c4389)>
          19: 0x0fc4d23c3d99 <JSFunction _getActiveRequests (sfi = 0xfc4d23c3d59)>
          20: 0x0fc4d23c3ea1 <JSFunction _getActiveHandles (sfi = 0xfc4d23c3e61)>
          21: 0x0fc4d23c42c1 <JSFunction reallyExit (sfi = 0xfc4d23c4281)>
          22: 0x0fc4d23c3fa9 <JSFunction _kill (sfi = 0xfc4d23c3f69)>
          23: 0x0fc4d23e22e9 <JSFunction cpuUsage (sfi = 0xfc4d23c4799)>
          24: 0x0fc4d23e2429 <JSFunction resourceUsage (sfi = 0xfc4d23c4951)>
          25: 0x0fc4d23e2369 <JSFunction memoryUsage (sfi = 0xfc4d23c4849)>
          26: 0x0fc4d23e23e9 <JSFunction kill (sfi = 0xfc4d23c48f9)>
          27: 0x0fc4d23e23a9 <JSFunction exit (sfi = 0xfc4d23c48a1)>
          28: 0x0fc4d23c4d19 <JSFunction process.openStdin (sfi = 0xfc4a1824d31)>
          29: 0x0fc4d23c4f51 <JSFunction getuid (sfi = 0xfc4d23c4f11)>
          30: 0x0fc4d23c5059 <JSFunction geteuid (sfi = 0xfc4d23c5019)>
          31: 0x0fc4d23c5161 <JSFunction getgid (sfi = 0xfc4d23c5121)>
          32: 0x0fc4d23c5269 <JSFunction getegid (sfi = 0xfc4d23c5229)>
          33: 0x0fc4d23c5371 <JSFunction getgroups (sfi = 0xfc4d23c5331)>
          34: 0x0fc4a181be99 <JSFunction deprecated (sfi = 0xfc422243a09)>
          35: 0x0fc4a181c069 <Object map = 0xfc474330f39>
          36: 0x0fc4a181c749 <JSFunction (sfi = 0xfc422245209)>
          37: 0x0fc4a181c4e9 <JSFunction setUncaughtExceptionCaptureCallback (sfi = 0xfc4222449f9)>
          38: 0x0fc4a181c529 <JSFunction hasUncaughtExceptionCaptureCallback (sfi = 0xfc422244a51)>
          39: 0x0fc4a181ca99 <JSFunction emitWarning (sfi = 0xfc422245a49)>
          40: 0x0fc4d23d64e1 <JSFunction nextTick (sfi = 0xfc4d23c9fd9)>
          41: 0x0fc4d23e4ff1 <JSFunction runNextTicks (sfi = 0xfc4d23c9f29)>
          42: 0x0fc4d23c32a1 <JSFunction _debugProcess (sfi = 0xfc4d23c3261)>
          43: 0x0fc4d23c33c9 <JSFunction _debugEnd (sfi = 0xfc4d23c3389)>
          44: 0x0fc422248121 <JSFunction process._startProfilerIdleNotifier (sfi = 0xfc422247b29)>
          45: 0x0fc422248159 <JSFunction process._stopProfilerIdleNotifier (sfi = 0xfc422247bc1)>
          46: 0x0fc4d23c34f1 <JSFunction abort (sfi = 0xfc4d23c34b1)>
          47: 0x0fc4a181d3f9 <JSFunction wrappedUmask (sfi = 0xfc42224a381)>
          48: 0x0fc4a181d3b9 <JSFunction wrappedChdir (sfi = 0xfc42224a329)>
          49: 0x0fc4a181d439 <JSFunction wrappedCwd (sfi = 0xfc42224a3d9)>
          50: 0x0fc4a181dad1 <JSFunction initgroups (sfi = 0xfc42224a831)>
          51: 0x0fc4a181db11 <JSFunction setgroups (sfi = 0xfc42224a889)>
          52: 0x0fc4a181dbc1 <JSFunction (sfi = 0xfc42224ad79)>
          53: 0x0fc4a181dc31 <JSFunction (sfi = 0xfc42224ad79)>
          54: 0x0fc4a181dca1 <JSFunction (sfi = 0xfc42224ad79)>
          55: 0x0fc4a181dd11 <JSFunction (sfi = 0xfc42224ad79)>
          56: 0x0fc4a181e061 <JSObject>

0xfc4a181c749: [Function] in OldSpace
 - map: 0x0fc474305e29 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - function prototype: <no-prototype-slot>
 - shared_info: 0x0fc422245209 <SharedFunctionInfo>
 - name: 0x0fc4c5ec17b1 <String[0]: #>
 - builtin: CompileLazy
 - formal_parameter_count: 2
 - kind: ArrowFunction
 - context: 0x0fc4a181c381 <FunctionContext[19]>
 - code: 0x20e18df446a1 <Code BUILTIN CompileLazy>
 - source code: (er, fromPromise) => {
    // It's possible that defaultTriggerAsyncId was set for a constructor
    // call that threw and was never cleared. So clear it now.
    clearDefaultTriggerAsyncId();

    // If diagnostic reporting is enabled, call into its handler to see
    // whether it is interested in handling the situation.
    // Ignore if the error is scoped inside a domain.
    // use == in the checks as we want to allow for null and undefined
    if (er == null || er.domain == null) {
      try {
        const report = internalBinding('report');
        if (report != null && report.shouldReportOnUncaughtException()) {
          report.writeReport(er ? er.message : 'Exception',
                             'Exception',
                             null,
                             er ? er : {});
        }
      } catch {}  // Ignore the exception. Diagnostic reporting is unavailable.
    }

    const type = fromPromise ? 'unhandledRejection' : 'uncaughtException';
    process.emit('uncaughtExceptionMonitor', er, type);
    if (exceptionHandlerState.captureFn !== null) {
      exceptionHandlerState.captureFn(er);
    } else if (!process.emit('uncaughtException', er, type)) {
      // If someone handled it, then great. Otherwise, die in C++ land
      // since that means that we'll exit the process, emit the 'exit' event.
      try {
        if (!process._exiting) {
          process._exiting = true;
          process.exitCode = 1;
          process.emit('exit', 1);
        }
      } catch {
        // Nothing to be done about it at this point.
      }
      return false;
    }

    // If we handled an error, then make sure any ticks get processed
    // by ensuring that the next Immediate cycle isn't empty.
    require('timers').setImmediate(noop);

    // Emit the after() hooks now that the exception has been handled.
    if (afterHooksExist()) {
      do {
        emitAfter(executionAsyncId());
      } while (hasAsyncIdStack());
    }
    // And completely empty the id stack, including anything that may be
    // cached on the native side.
    clearAsyncIdStack();

    return true;
  }
 - properties: 0x0fc4c5ec1309 <FixedArray[0]> {
    0xfc4c5ec49c9: [String] in ReadOnlySpace: #length: 0x0fc48aa41499 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec4b21: [String] in ReadOnlySpace: #name: 0x0fc48aa41429 <AccessorInfo> (const accessor descriptor)
 }
 - feedback vector: feedback metadata is not available in SFI

0xfc4a181c381: [Context] in OldSpace
 - map: 0x0fc474309309 <Map>
 - length: 19
 - scope_info: 0x0fc422244479 <ScopeInfo FUNCTION_SCOPE [42]>
 - previous: 0x0fc42315cf99 <NativeContext[243]>
 - native_context: 0x0fc42315cf99 <NativeContext[243]>
           0: 0x0fc422244479 <ScopeInfo FUNCTION_SCOPE [42]>
           1: 0x0fc42315cf99 <NativeContext[243]>
           2: 0x0fc4222455d9 <JSFunction internalBinding (sfi = 0xfc4a1822e79)>
           3: 0x0fc42224acd1 <process map = 0xfc474331dd9>
           4: 0x0fc422244439 <JSFunction nativeModuleRequire (sfi = 0xfc4a1822d31)>
           5: 0x0fc4a180f3b9 <Object map = 0xfc47432b029>
           6: 0x0fc42224b0e1 <JSFunction NodeError (sfi = 0xfc4a182df49)>
           7: 0x0fc422265089 <JSFunction NodeError (sfi = 0xfc4a182df49)>
           8: 0x0fc422264709 <JSFunction NodeError (sfi = 0xfc4a182df49)>
           9: 0x0fc4d23e2529 <JSFunction executionAsyncId (sfi = 0xfc4d23c79d1)>
          10: 0x0fc4d23e7941 <JSFunction clearDefaultTriggerAsyncId (sfi = 0xfc4d23c7501)>
          11: 0x0fc4d23c84e1 <JSFunction clearAsyncIdStack (sfi = 0xfc4d23c84a1)>
          12: 0x0fc4d23e45f1 <JSFunction hasAsyncIdStack (sfi = 0xfc4d23c78c9)>
          13: 0x0fc4d23e5e61 <JSFunction afterHooksExist (sfi = 0xfc4d23c76b9)>
          14: 0x0fc4d23e4571 <JSFunction emitAfterScript (sfi = 0xfc4d23c7819)>
          15: 0x0fc422242641 <Uint32Array map = 0xfc4743083d9>
          16: 0x0fc4a181c429 <JSFunction tryGetCwd (sfi = 0xfc4222446f1)>
          17: 0x0fc4a181c5e9 <Object map = 0xfc474330fc9>
          18: 0x0fc4a181c569 <JSFunction noop (sfi = 0xfc422244aa9)>

0xfc4d23e2529: [Function] in OldSpace
 - map: 0x0fc474305eb9 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x0fc42315d941 <JSFunction (sfi = 0xfc48aa4d8a1)>
 - elements: 0x0fc4c5ec1309 <FixedArray[0]> [HOLEY_ELEMENTS]
 - function prototype: 
 - initial_map: 
 - shared_info: 0x0fc4d23c79d1 <SharedFunctionInfo executionAsyncId>
 - name: 0x0fc4d23c64c9 <String[16]: #executionAsyncId>
 - builtin: CompileLazy
 - formal_parameter_count: 0
 - kind: NormalFunction
 - context: 0x0fc4d23e3651 <FunctionContext[67]>
 - code: 0x20e18df446a1 <Code BUILTIN CompileLazy>
 - source code: () {
  return async_id_fields[kExecutionAsyncId];
}
 - properties: 0x0fc4c5ec1309 <FixedArray[0]> {
    0xfc4c5ec49c9: [String] in ReadOnlySpace: #length: 0x0fc48aa41499 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec4b21: [String] in ReadOnlySpace: #name: 0x0fc48aa41429 <AccessorInfo> (const accessor descriptor)
    0xfc4c5ec4e09: [String] in ReadOnlySpace: #prototype: 0x0fc48aa41509 <AccessorInfo> (const accessor descriptor)
 }
 - feedback vector: feedback metadata is not available in SFI

0xfc4d23e3651: [Context] in OldSpace
 - map: 0x0fc474309309 <Map>
 - length: 67
 - scope_info: 0x0fc4d23c6969 <ScopeInfo FUNCTION_SCOPE [138]>
 - previous: 0x0fc42315cf99 <NativeContext[243]>
 - native_context: 0x0fc42315cf99 <NativeContext[243]>
           0: 0x0fc4d23c6969 <ScopeInfo FUNCTION_SCOPE [138]>
           1: 0x0fc42315cf99 <NativeContext[243]>
           2: 0x0fc42224acd1 <process map = 0xfc474331dd9>
           3: 0x0fc422244439 <JSFunction nativeModuleRequire (sfi = 0xfc4a1822d31)>
           4: 0x0fc42226c921 <JSFunction (sfi = 0xfc4a18200d9)>
           5: 0x0fc423160d01 <JSFunction Error (sfi = 0xfc48aa50681)>
           6: 0x0fc42226d6a9 <JSFunction (sfi = 0xfc4a18200d9)>
           7: 0x0fc42224cea9 <JSFunction (sfi = 0xfc4a18200d9)>
           8: 0x0fc42315e209 <JSFunction defineProperty (sfi = 0xfc48aa4e011)>
           9: 0x0fc423165989 <JSFunction Promise (sfi = 0xfc48aa54171)>
          10: 0x0fc42316c731 <JSFunction apply (sfi = 0xfc48aa57919)>
          11: 0x0fc4d23e25a9 <JSObject>
          12: 0x0fc422244321 <Uint32Array map = 0xfc4743083d9>
          13: 0x0fc422247301 <Float64Array map = 0xfc4743068d9>
          14: 0x0fc4d23d3439 <JSArray[0]>
          15: 0x0fc4d23c81c9 <JSFunction pushAsyncContext (sfi = 0xfc4d23c8189)>
          16: 0x0fc4d23c82d1 <JSFunction popAsyncContext (sfi = 0xfc4d23c8291)>
          17: 0x0fc4d23c83d9 <JSFunction executionAsyncResource (sfi = 0xfc4d23c8399)>
          18: 0x0fc4d23c8719 <JSFunction enablePromiseHook (sfi = 0xfc4d23c86d9)>
          19: 0x0fc4d23c8821 <JSFunction disablePromiseHook (sfi = 0xfc4d23c87e1)>
          20: 0x0fc4d23df1f1 <Object map = 0xfc474325239>
          21: 0x0fc4d23c8e11 <JSFunction enqueueMicrotask (sfi = 0xfc4d23c8dd1)>
          22: 0x0fc423141599 <Symbol: resource_symbol>
          23: 0
          24: 1
          25: 2
          26: 3
          27: 4
          28: 6
          29: 0
          30: 2
          31: 1
          32: 3
          33: 7
          34: 8
          35: 0x0fc423141331 <Symbol: async_id_symbol>
          36: 0x0fc4231415d9 <Symbol: trigger_async_id_symbol>
          37: 0x0fc4d23c9341 <Symbol: init>
          38: 0x0fc4d23ded91 <JSBoundFunction (BoundTargetFunction 0xfc4d23ce6e1)>
          39: 0x0fc4d23de761 <JSBoundFunction (BoundTargetFunction 0xfc4d23ce6e1)>
          40: 0x0fc4d23de7c1 <JSBoundFunction (BoundTargetFunction 0xfc4d23ce6e1)>
          41: 0x0fc4c5ec1599 <undefined>
          42: 0x0fc4d23d7899 <Object map = 0xfc474305e71>
          43: 0x0fc4d23d3041 <JSFunction fatalError (sfi = 0xfc4d23c6ed1)>
          44: 0x0fc4d23d3081 <JSFunction lookupPublicResource (sfi = 0xfc4d23c6f29)>
          45: 0x0fc4d23ce6a1 <JSFunction emitInitNative (sfi = 0xfc4d23c6f81)>
          46: 0x0fc4d23ce6e1 <JSFunction emitHook (sfi = 0xfc4d23c6fd9)>
          47: 0x0fc4d23cb851 <JSFunction storeActiveHooks (sfi = 0xfc4d23c70e1)>
          48: 0x0fc42315ea31 <JSFunction copyHooks (sfi = 0xfc4d23c7139)>
          49: 0x0fc42315ea71 <JSFunction restoreActiveHooks (sfi = 0xfc4d23c7191)>
          50: 0x0fc423177bd9 <JSFunction trackPromise (sfi = 0xfc4d23c71e9)>
          51: 0x0fc423177c19 <JSFunction fastPromiseHook (sfi = 0xfc4d23c7241)>
          52: 0x0fc4c5ec1769 <false>
          53: -1
          54: 0x0fc4d23cd4c1 <JSFunction disablePromiseHookIfNecessary (sfi = 0xfc4d23c73a1)>
          55: 0x0fc4d23e7881 <JSFunction newAsyncId (sfi = 0xfc4d23c73f9)>
          56: 0x0fc4d23e78c1 <JSFunction getOrSetAsyncId (sfi = 0xfc4d23c7451)>
          57: 0x0fc4d23e7901 <JSFunction getDefaultTriggerAsyncId (sfi = 0xfc4d23c74a9)>
          58: 0x0fc4d23e6669 <JSFunction hasHooks (sfi = 0xfc4d23c75b1)>
          59: 0x0fc4d23e66a9 <JSFunction enabledHooksExist (sfi = 0xfc4d23c7609)>
          60: 0x0fc4d23e66e9 <JSFunction initHooksExist (sfi = 0xfc4d23c7661)>
          61: 0x0fc4d23e5ea1 <JSFunction destroyHooksExist (sfi = 0xfc4d23c7711)>
          62: 0x0fc4d23e5ee1 <JSFunction emitInitScript (sfi = 0xfc4d23c7769)>
          63: 0x0fc4d23e5f21 <JSFunction emitBeforeScript (sfi = 0xfc4d23c77c1)>
          64: 0x0fc4d23e4631 <JSFunction pushAsyncContext (sfi = 0xfc4d23c7921)>
          65: 0x0fc4d23e24e9 <JSFunction popAsyncContext (sfi = 0xfc4d23c7979)>
          66: 0x0fc4d23e2529 <JSFunction executionAsyncId (sfi = 0xfc4d23c79d1)>

0xfc422244321: [JSTypedArray] in OldSpace
 - map: 0x0fc4743083d9 <Map(UINT32ELEMENTS)> [FastProperties]
 - prototype: 0x0fc42316c909 <Object map = 0xfc474308421>
 - elements: 0x0fc4c5ec2e49 <ByteArray[0]> [UINT32ELEMENTS]
 - embedder fields: 2
 - buffer: 0x0fc422267e51 <ArrayBuffer map = 0xfc4743086f1>
 - byte_offset: 0
 - byte_length: 36
 - length: 9
 - data_ptr: 0x2
   - base_pointer: 0x0
   - external_pointer: 0x2
 - properties: 0x0fc4c5ec1309 <FixedArray[0]> {}
 - elements: 0x0fc4c5ec2e49 <ByteArray[0]> {

[joyeecheung]

I dug around a bit and it looks like it's not related to the global uncaught exception handler after all. As long as the serializer reaches a Uint32Array in the closure of getDefaultTriggerAsyncId or executionAsyncId (pretty sure it's async_hook_fields), it tries to obtain a back reference to it and that back reference is somehow invalid. Still looking into why that's the case..

[targos]

This is affecting V8 8.7: nodejs/node#35700 (comment)

[joyeecheung]

Maybe it would be easier to fix if we find the V8 commit where this starts to fail. Is there a way to automate bisect between two V8 versions with Node? Or do you have closer hashes other than v8.6 and v8.7? @targos

[targos]

I do not have a way to bisect V8 versions with Node. The only additional info I can give you is that the oldest CI run with canary, which was on Sep 15, 2020, already showed that failure.

It gives us this commit range, if I compare from the point of 8.6 branch to Sep 16: v8/v8@a626bc0...c73ca67

[joyeecheung]

From the CI this also at least showed up on Sep 11, do you remember the last good commit of this?

[joyeecheung]

Oh, wait, the last good commit should be a626bc036236c9bf92ac7b87dc40c9e538b087e3. This gives us v8/v8@a626bc0...86e5f1a

[targos]

@joyeecheung where did you find this? I can only go back to Sep 15 in the history

[joyeecheung]

@targos https://ci.nodejs.org/job/node-test-commit-node-v8/602/

[targos]

Still a lot of candidates :(