RangeError: Invalid string length in LeakTraceDetailsLogger

[johnhok]

Error

I'm getting this an RangeError: Invalid string length when I run memlab in a CI environment.

It looks to be related to JSON.stringify in the LeakTraceDetailsLogger.

https://github.com/facebook/memlab/blob/16b4d9a3f1d383b02a67a4d87596f8a16c0d1f86/packages/core/src/logger/LeakTraceDetailsLogger.ts#L44

Notes

• While digging around, it generally looks like this is an OOM in node when trying to stringify a large object. I've tried tweaking the execution environment to increase memory but have been unsuccessful in resolving.
• Unfortunately, I've also been unable to reproduce this on my local machine and I've been unable to extract the heap snapshots that generates this specific error (for other reasons).
• The heap dumps don't seem particularly complex from the sizes
  • ex. page-load[27.5MB](baseline)[s1] > action-on-page[62MB](target)[s2] > revert[59.1MB](final)[s3]

Does anyone have thoughts on alternative solutions to resolve this or have encountered a similar situation?

[JacksonGL]

RangeError: Invalid string length indicates that the string is too large, causing the JavaScript engine to throw an exception. Since the traceJSON result is not critical for most use cases, you can temporarily resolve this issue by commenting out the JSON.stringify statement and replacing it with something like:

const traceJSON = '{}';

I will add a guard check to this statement later.

[johnhok]

Are you planning on bumping the memlab versions? I see you have the proper fix in place now. Thanks for the help!

[JacksonGL]

@johnhok The fix is released in memlab@1.1.49. Thanks for reporting this issue