Johannes Pfrang [:johnp] Reporter
	Description • 9 years ago

This bug was filed from the Socorro interface and is 
report bp-3fdaedae-0cb3-4b11-ab9c-e1d222150823.
=============================================================

Latest Firefox nightly freezes reliably after some minutes of usage. No STR yet.

Crashed it with SIGABRT three times, all reports identical:

bp-43880f33-e2b5-4508-9a5e-758f02150823
bp-2842a1b8-eb91-46c8-885f-72d8c2150823
bp-3fdaedae-0cb3-4b11-ab9c-e1d222150823

	Johannes Pfrang [:johnp] Reporter
	Comment 1 • 9 years ago

Seems to work again after a full system restart + kernel update to 4.1.6.

	Johannes Pfrang [:johnp] Reporter
	Comment 2 • 9 years ago

Not...
Safe-Mode didn't freeze yet, so investigating if it's Add-On related.

	Johannes Pfrang [:johnp] Reporter
	Comment 3 • 9 years ago

Ok, this is only reproducible when enabling EGL for KWin.
Related to KDE bug 347507:

https://bugs.kde.org/show_bug.cgi?id=347507

	Mason Chang [Inactive] [:mchang]
	Comment 4 • 9 years ago

From the crash reports, it's crashing at the PollWrapper[1], which was added by bug 429592.

[1] https://dxr.mozilla.org/mozilla-central/source/widget/gtk/nsAppShell.cpp?offset=100#42

	Johannes Pfrang [:johnp] Reporter
	Comment 5 • 9 years ago

Fwiw (without knowing any of the involved components), it looks to me like Firefox is still running as intended (aka not hanging, also indicated by fluctuating CPU/RAM-usage), but somehow Firefox and KDEs taskbar trigger EGL code that results in some areas not getting repainted anymore (does that make any sense?). On KDEs taskbar for example, highlights for hovered windows still work, but the highlight for the active window is stuck.
Another bit of info: With another session I was able to reproduce the freeze nearly instantly, so maybe one of the websites triggers the issue. Please also cross-read the KDE bug, as I may mix some things up unintended.

	Johannes Pfrang [:johnp] Reporter
	Comment 6 • 9 years ago

Cross-Post: KWin + EGL + Intel SNA are needed to trigger the issue.
(Note: SNA is default, EGL not)

Using multiple windows, I'm able to get the window with the mentioned session to freeze, while the window where I'm writing this comment is fully functional. I'll try to reduce the session tomorrow.

	Johannes Pfrang [:johnp] Reporter
	Comment 7 • 9 years ago

The bug-report has been closed upstream, because apparently Intel SNA has issues with GLX clients in an EGL compositor.

Should this bug remain open and depend on bug 788319 for tracking purposes / easiness to find or should it be closed instead?

	Wayne Mery (:wsmwk)
	Comment 8 • 9 years ago

(In reply to Johannes Pfrang [:johnp] from comment #7)
> The bug-report has been closed upstream, because apparently Intel SNA has
> issues with GLX clients in an EGL compositor.
> 
> Should this bug remain open and depend on bug 788319 for tracking purposes /
> easiness to find or should it be closed instead?

	u279076
	Comment 9 • 9 years ago

I'm not sure what we should do here. If it's been resolved upstream then perhaps there's nothing to be done on our end and this can be closed. Anecdotally, the crash signature has only had 1 report over the last week and 43 reports over the last 6 months (all but one are on unsupported Firefox versions).

I would say that this should certainly be added to the dependency tree for bug 788319 just for tracking purposes. However, I'll leave it up to Milan to decide if this bug should remain open.

	Johannes Pfrang [:johnp] Reporter
	Comment 10 • 9 years ago

Not exactly resolved, but it looks like you can work around a lot of EGL issues (including this one) by also enabling DRI3. Going to test these settings (SNA+EGL+DRI3) and report back. Maybe we can get a good workaround for people running into this.

	Johannes Pfrang [:johnp] Reporter
	Comment 11 • 9 years ago

Looks good! No freezes here. Example xorg.conf or xorg.conf.d/20-intel.conf:

> Section "Device"
>  Identifier "Intel Graphics"
>  Driver "intel"
>  Option "AccelMethod" "sna"
>  Option "DRI" "3"
> EndSection

	u279076
	Comment 12 • 9 years ago

Thanks for checking.