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Web component tests randomly hang on Firefox #1352

Open Hexcles opened 5 years ago

Hexcles commented 5 years ago

The tests randomly hang about half way through and every time it might get stuck at a different location.

Hexcles commented 4 years ago

This issue seems to have reappeared, this time on GitHub Actions. e.g.

https://github.com/web-platform-tests/wpt.fyi/pull/1554/checks?check_run_id=271841178#step:3:708

Hexcles commented 4 years ago

cc @stephenmcgruer

Hexcles commented 4 years ago

https://github.com/web-platform-tests/wpt.fyi/pull/1584/checks?check_run_id=274075821#step:3:994 showed something interesting:

A content process crashed and MOZ_CRASHREPORTER_SHUTDOWN is set, shutting down

But I can't reproduce the crash locally.

Hexcles commented 4 years ago

I still can't reproduce the hang locally. For a moment, I thought the root cause was a big test file (test-runs-query-builder.js), but no I cannot prove conclusively that splitting the test makes the hang less often.

My best guess is that we are seeing the content process crashing, potentially due to lack of resources (memory?) on GitHub Actions.