Bug#1050512: gnome-shell: Crash when viewing video with mpv

[Marc Glisse]

On Sun, 10 Sep 2023, Simon McVittie wrote:

> Would you be able to reproduce this with MUTTER_SYNC=1 in the environment
> (setting it in ~/.config/environment.d/mutter-sync.conf should apparently
> work) to confirm that it's the same crash as mutter#2857 upstream?

I was hoping to wait until the other bug was fixed, since producing the 
trace is a bit of work.

> You say this happens when playing a video with mpv: perhaps this could
> be because mpv disables power saving / screen blanking while it's playing
> the video?

I have no idea. It also happens (but less quickly) when watching videos 
full screen with firefox.

> If you install the x11-xserver-utils package and run "xset -dpms", does
> that trigger the same crash?

No, it doesn't seem to have any effect.

> There is a merge request upstream which *might* fix this. If you are able
> to rebuild the mutter source package with patches applied, please try
> applying the attached file "bug1050512-without-xsync.patch" and see whether
> you can reproduce the crash. If that works, please report back. If not,
> please revert that change, apply "bug1050512-with-xsync.patch", rebuild
> and try again.

The first patch does not work (still crashing). The second one does seem 
to help, that's great! Playing a few videos did not trigger any crash :-)

If the problem reappears (with a lower frequency), I'll write again.

> If you're not able to rebuild the mutter source package,

I had to use DEB_BUILD_OPTIONS=nocheck since several tests were failing, 
including some with very long timeouts.

> there's a heatwave here at the moment,

Same here...

-- 
Marc Glisse