The PID & type of crashed processes are printed out in tests

[Gabriele Svelto]

[cross-posting to stability]

Hiya all,
a couple of weeks ago I landed bug 1840651 [1] which lets you know what
was the PID and type of processes that crashed while running tests. This
works both locally and in automation (with slight differences depending
on the type of test you're running).

So whenever you'd encounter this output while running a test:

PROCESS-CRASH | application crashed [@ None + None] |
dom/media/autoplay/test/browser/browser.ini
INFO - Crash dump filename:
/var/folders/yn/mn96mnjd2rvfmzjwbmygq740000014/T/tmpurvm3rsy.mozrunner/minidumps/13E0A8D2-7C5B-48CE-BB2E-2AF61A3AFFF0.dmp
INFO - Operating system: Mac OS X
...

You'll now get something like this:

PROCESS-CRASH | application crashed [@ None + None] |
dom/media/autoplay/test/browser/browser.ini
INFO - Crash dump filename:
/var/folders/yn/mn96mnjd2rvfmzjwbmygq740000014/T/tmpurvm3rsy.mozrunner/minidumps/13E0A8D2-7C5B-48CE-BB2E-2AF61A3AFFF0.dmp
INFO - Process type: utility
INFO - Process pid: 1854
INFO - Operating system: Mac OS X
...

Here's a real-world example from treeherder:

https://treeherder.mozilla.org/logviewer?job_id=423528959&repo=mozilla-central&lineNumber=5471-5472

The process type is printed out correctly on all platforms but for the
time being the PID is only printed out on macOS and Windows. Linux needs
some changes to the stackwalker which I haven't done yet (but will do soon).

Gabriele

[1] [mozcrash] Print the process ID and type for every minidump we encounter
https://bugzilla.mozilla.org/show_bug.cgi?id=1840651

[Mike Conley]

This is great, thank you!