vercel: `now dev` resulting in intermittent by frequent `FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory`

Hey guys,

We’re starting to see this quite frequently now. Sometimes it will happen immediately, other times after 5mins or so.

Have tried a number of different node 10.* versions and see the same thing.

Have also tried setting export NODE_OPTIONS=--max_old_space_size=8192 and still see the same thing.

Any ideas?

[ event ] build page: /deposit
[ wait ]  compiling ...

<--- Last few GCs --->

[7076:0x10280a000]   150807 ms: Scavenge 1369.2 (1408.2) -> 1367.9 (1409.2) MB, 3.6 / 0.0 ms  (average mu = 0.185, current mu = 0.147) allocation failure 
[7076:0x10280a000]   150815 ms: Scavenge 1369.3 (1409.2) -> 1368.3 (1411.2) MB, 3.1 / 0.0 ms  (average mu = 0.185, current mu = 0.147) allocation failure 
[7076:0x10280a000]   150829 ms: Scavenge 1372.3 (1412.7) -> 1370.3 (1421.2) MB, 3.1 / 0.0 ms  (average mu = 0.185, current mu = 0.147) allocation failure 


<--- JS stacktrace --->

==== JS stack trace =========================================

Security context: 0x2a6ae3e1e6e9 <JSObject>
    0: builtin exit frame: parse(aka parse)(this=0x2a6aa20826f1 <undefined>,0x2a6a81462909 <Uint8Array map = 0x2a6ae031d1c1>,0x2a6aa20826f1 <undefined>)

    1: getStats [0x2a6a375f9861] [/Users/<snipped>/code/<snipped>/now/web/node_modules/autodll-webpack-plugin/lib/createMemory.js:82] [bytecode=0x2a6a93005349 offset=31](this=0x2a6a375f6bf9 <Object map = 0x2a6a14499ee1>)
    2: /* anonymous */(aka ...

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: 0x10003d041 node::Abort() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
 2: 0x10003d24b node::OnFatalError(char const*, char const*) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
 3: 0x1001b8e25 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
 4: 0x100586d82 v8::internal::Heap::FatalProcessOutOfMemory(char const*) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
 5: 0x100589855 v8::internal::Heap::CheckIneffectiveMarkCompact(unsigned long, double) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
 6: 0x1005856ff v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
 7: 0x1005838d4 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
 8: 0x10059016c v8::internal::Heap::AllocateRawWithLigthRetry(int, v8::internal::AllocationSpace, v8::internal::AllocationAlignment) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
 9: 0x1005901ef v8::internal::Heap::AllocateRawWithRetryOrFail(int, v8::internal::AllocationSpace, v8::internal::AllocationAlignment) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
10: 0x100562074 v8::internal::Factory::NewRawTwoByteString(int, v8::internal::PretenureFlag) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
11: 0x10065c5a8 v8::internal::Handle<v8::internal::String> v8::internal::JsonParser<false>::SlowScanJsonString<v8::internal::SeqTwoByteString, unsigned short>(v8::internal::Handle<v8::internal::String>, int, int) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
12: 0x10065ac7d v8::internal::JsonParser<false>::ParseJsonValue() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
13: 0x10065e5a0 v8::internal::JsonParser<false>::ParseJsonObject() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
14: 0x10065ae09 v8::internal::JsonParser<false>::ParseJsonValue() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
15: 0x10065f4c2 v8::internal::JsonParser<false>::ParseJsonArray() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
16: 0x10065acef v8::internal::JsonParser<false>::ParseJsonValue() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
17: 0x10065ec52 v8::internal::JsonParser<false>::ParseJsonObject() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
18: 0x10065ae09 v8::internal::JsonParser<false>::ParseJsonValue() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
19: 0x10065a6d1 v8::internal::JsonParser<false>::ParseJson() [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
20: 0x10065a541 v8::internal::JsonParser<false>::Parse(v8::internal::Isolate*, v8::internal::Handle<v8::internal::String>, v8::internal::Handle<v8::internal::Object>) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
21: 0x100279ffc v8::internal::Builtin_Impl_JsonParse(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/Users/<snipped>/.nvm/versions/node/v10.17.0/bin/node]
22: 0x3a6f9eadbf9d 
23: 0x3a6f9ea918d5 
> Error! Failed to complete request to /web/static/favicon.ico: Error: connect ECONNREFUSED 127.0.0.1:5000
> Error! Failed to complete request to /web/_next/webpack-hmr?page=%2Fwallet: Error: connect ECONNREFUSED 127.0.0.1:5000