Bug#897390: xwayland: Segmentation fault loading GNOME 3

[Manolinux <mu@member.fsf.org>]

Package: xwayland
Version: 2:1.19.6-1
Severity: grave
Justification: renders package unusable

This started happening to me when I updated the system after a long time.

When I login into GNOME 3 (default session), the system appears to be loading
correctly, I can see the wallpaper and the activities bar, but before I can
interact with anything, the system crashes and I'm returned to the GDM window.

a core file is left on the HOME directory, which belongs to xwayland
executable.

I can start a GNOME classic or GNOME flashback session and no crash happens.

---

I don't know if it is related somehow, but since the same update, GDM login
window is displayed weird, I can't see the user names and some other characters
are missing (i.e. it says "GNOME Fl sh  k" instead of "GNOME Flashback").



-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386, armel

Kernel: Linux 4.15.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8),
LANGUAGE=es_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages xwayland depends on:
ii  libaudit1           1:2.8.2-1
ii  libbsd0             0.8.7-1
ii  libc6               2.27-3
ii  libdrm2             2.4.91-2
ii  libegl1             1.0.0+git20180308-2
ii  libepoxy0           1.4.3-1
ii  libgbm1             17.3.9-1
ii  libgcrypt20         1.8.2-2
ii  libgl1              1.0.0+git20180308-2
ii  libpixman-1-0       0.34.0-2
ii  libselinux1         2.7-2+b2
ii  libsystemd0         238-4
ii  libwayland-client0  1.14.0-2
ii  libxau6             1:1.0.8-1+b2
ii  libxdmcp6           1:1.1.2-3
ii  libxfont2           1:2.0.3-1
ii  libxshmfence1       1.3-1
ii  xserver-common      2:1.19.6-1

xwayland recommends no packages.

xwayland suggests no packages.