URL.canParse fails when stressed

[joacub]

Version

20.4.0

Platform

any

Subsystem

No response

What steps will reproduce the bug?

while (true) {
  const test = URL.canParse('/ ', 'http://n');
  console.log(test);
}

How often does it reproduce? Is there a required condition?

after some stress

What is the expected behavior? Why is that the expected behavior?

same result as first one

What do you see instead?

return false at some point of stress

Additional information

No response

[joacub]

another test in my end doing a 100ms wait wil not have the same beharviour in that case return true always:

import { setTimeout } from 'timers/promises';
while (true) {
  await setTimeout(100);
  const test = URL.canParse('/ ', 'http://n');
  console.log(test);
}

this will also fail at some point so maybe the 100 ms will aso fail just didnt get the point were it will fail

import { setTimeout } from 'timers/promises';
while (true) {
  await setTimeout(1);
  const test = URL.canParse('/ ', 'http://n');
  console.log(test);
}

[joacub]

@anonrig i think you are following this changes so you may have all the details about this

[anonrig]

Thanks for the bug report. I confirm this is indeed a really awkward bug. cc @nodejs/url

[anonrig]

This is probably due to v8 Fast API. When you call it multiple times, it triggers v8 fast api.

[anonrig]

@KhafraDev disabling/commenting out V8 Fast API fixes the bug

[anonrig]

@joacub I opened a PR to fix this: #48817

[joacub]

@joacub I opened a PR to fix this: #48817

Thank you so much sir, we are facing many many issues due to this and our websites goes down very often, thank you so much for your work