yarn start crashes with "JavaScript heap out of memory" after a while

[weeman1337]

Steps to reproduce

1. Set up a dev environment
2. Run yarn start
3. Edit the source code

Outcome

What did you expect?

No crash

What happened instead?

After a while the process crashes with „JavaScript heap out of memory“

Log

2022-10-06 15:14:57.579 [element-js] 
2022-10-06 15:14:57.579 [element-js] <--- Last few GCs --->
2022-10-06 15:14:57.579 [element-js] 
2022-10-06 15:14:57.579 [element-js] [46054:0x673ff00] 11676387 ms: Mark-sweep 1994.2 (2066.3) -> 1973.6 (2045.6) MB, 167.9 / 0.1 ms  (average mu = 0.150, current mu = 0.115) allocation failure scavenge might not succeed
2022-10-06 15:14:57.579 [element-js] [46054:0x673ff00] 11676395 ms: Scavenge 1989.1 (2061.1) -> 1976.2 (2048.2) MB, 1.2 / 0.0 ms  (average mu = 0.150, current mu = 0.115) allocation failure 
2022-10-06 15:14:57.579 [element-js] [46054:0x673ff00] 11676403 ms: Scavenge 1991.7 (2063.7) -> 1978.7 (2050.8) MB, 1.2 / 0.0 ms  (average mu = 0.150, current mu = 0.115) allocation failure 
2022-10-06 15:14:57.579 [element-js] 
2022-10-06 15:14:57.579 [element-js] 
2022-10-06 15:14:57.579 [element-js] <--- JS stacktrace --->
2022-10-06 15:14:57.579 [element-js] 
2022-10-06 15:14:57.579 [element-js] FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
2022-10-06 15:14:57.594 [element-js]  1: 0xb02960 node::Abort() [/usr/bin/node]
2022-10-06 15:14:57.594 [element-js]  2: 0xa18149 node::FatalError(char const*, char const*) [/usr/bin/node]
2022-10-06 15:14:57.594 [element-js]  3: 0xcdd22e v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [/usr/bin/node]
2022-10-06 15:14:57.595 [element-js]  4: 0xcdd5a7 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [/usr/bin/node]
2022-10-06 15:14:57.595 [element-js]  5: 0xe94c15  [/usr/bin/node]
2022-10-06 15:14:57.596 [element-js]  6: 0xe956f6  [/usr/bin/node]
2022-10-06 15:14:57.596 [element-js]  7: 0xea3c1e  [/usr/bin/node]
2022-10-06 15:14:57.596 [element-js]  8: 0xea4660 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [/usr/bin/node]
2022-10-06 15:14:57.597 [element-js]  9: 0xea75de v8::internal::Heap::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [/usr/bin/node]
2022-10-06 15:14:57.597 [element-js] 10: 0xe68852 v8::internal::Factory::AllocateRaw(int, v8::internal::AllocationType, v8::internal::AllocationAlignment) [/usr/bin/node]
2022-10-06 15:14:57.598 [element-js] 11: 0xe60e64 v8::internal::FactoryBase<v8::internal::Factory>::AllocateRawWithImmortalMap(int, v8::internal::AllocationType, v8::internal::Map, v8::internal::AllocationAlignment) [/usr/bin/node]
2022-10-06 15:14:57.598 [element-js] 12: 0xe62ec1 v8::internal::FactoryBase<v8::internal::Factory>::NewRawTwoByteString(int, v8::internal::AllocationType) [/usr/bin/node]
2022-10-06 15:14:57.599 [element-js] 13: 0x1200c49 v8::internal::Runtime_StringBuilderConcat(int, unsigned long*, v8::internal::Isolate*) [/usr/bin/node]
2022-10-06 15:14:57.599 [element-js] 14: 0x15d54f9  [/usr/bin/node]
2022-10-06 15:15:51.535 [element-js] Aborted (core dumped)

Operating system

Ubuntu 22.04.1 LTS

Browser information

Firefox 105.0.2 (64-bit)

URL for webapp

No response

Application version

fb686ec

Homeserver

No response

Will you send logs?

No

[t3chguy]

Edit the source code

Is it specific to this edit?
I had this happen once when I did weird whacky stuff with workers - matrix-org/matrix-react-sdk#9223

[weeman1337]

Edit the source code

Is it specific to this edit? I had this happen once when I did weird whacky stuff with workers - matrix-org/matrix-react-sdk#9223

No fancy stuff. Just editing the files. After a while it crashes. I would say about once per hour.

[weeman1337]

Happens regularly when editing PCSS files.

[t3chguy]

@weeman1337 are you still seeing this?

[weeman1337]

Yes, it crashes every 5-10 .pcss edits. My current workaround is while true; do yarn start; sleep 1; done 😉