On 2/27/2016 9:06 PM, Randell Jesup wrote:
months until recently it popped up a bit). Note that this failure
*never* results in a crashdump, and I've never seen it locally, just in
Automation.
What we do know:
* Exit code -11 is evidence a SIGSEGV (crash).
This I don't know, but somebody may know (+ted):
* Are we sure that the crash is happening in firefox.exe? Or is it
possible that some other process is crashing and taking down our
test harness with it?
* Can somebody point to exactly what line of code in the test harness
collects the -11 code?
* Is there no crash dump because the crash reporter is turned off?
o If it's turned on, is the crash reporter itself crashing? Or is
the test harness not picking up the crash dump?
We *need* to find some solution to it -- even if it's to decide it's a
(safe) artifact of some underlying problem outside of our control.
Is "we" you? Are you asking somebody else to help you with this, or own
the problem completely?
I'd
far rather find a true cause and either fix or wallpaper it. But right
now it's stopping me from landing some important code changes.
On the plus side, I have a nice Try run which will cause it 100% of the
time - though when I tried to provoke it on a loaner Test VM after
painfully emulating what's needed to run tests, it wouldn't fail -- but
I don't trust that was a well-setup recreation of a real Try run.
https://treeherder.mozilla.org/#/jobs?repo=try&revision=b2eb01359621
IIRC, there was recently a post about how you can submit a try job and
have the VM stay alive afterwards for postmortem debugging. I don't
remember/can't find the details right now
Can we also submit a try job with rr enabled, and get a recording of the
failure? That combination could lead to a pretty quick cause diagnosis
of this, since it's Linux.
Also, does this failure happen if you disable all the tests except for
the one which is permafailing
(dom/media/tests/mochitest/identity/test_setIdentityProviderWithErrors.html)?
If so, that would make it easier to record and debug.
--BDS
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