Bug#950890: xserver-xorg-core: X segfaults when displaying a big image with xzgv

[Frédéric Brière <fbriere@fbriere.net>]

On Mon, Feb 10, 2020 at 10:30:44AM +0100, Michel Dänzer wrote:
> Can't see the backtrace,

It was attached as gdb.txt.  (Granted, I could've renamed it to
something a bit more obvious.)

> but the log excerpt above looks like the fixes
> from https://gitlab.freedesktop.org/xorg/xserver/merge_requests/135
> might help, so I added them to
> https://gitlab.freedesktop.org/xorg/xserver/merge_requests/391 and they
> will hopefully be in the upcoming 1.20.8 release.

Thanks!  I've applied !391 to 2:1.20.7-3 (except for the one patch that
was already included), and it does seem to solve the issue.  Now,
instead of crashing, the server merely freezes for 5-15 seconds before
it emits a warning and keeps going on.

Thank you once again!