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Bug#939861: Session crashes after unlocking if the screen size has changed while locked

Package: xfce4-session
Version: 4.12.1-6
Severity: normal


thank you for maintaining xfce! I am not sure if this is an issue in
xfce4-session or lightdm/light-locker, feel free to reassign. I also
didn't change the severity, although it could potentially be higher, as
this causes data loss.

What happens is this:

 - I lock the screen, either explicitly or by closing the lid /
 - I unplug or plug my external screen
 - I [resume and] get the lightdm greeter
 - I enter my username/password to unlock
 - there's a flicker, and I get back to the greeter. The session
   has died
 - I enter my username/password and I find an empty session. All my open
   windows have died, all my unsaved work is lost.

It doesn't always happen, but it happens often when there's been a
change in the screen geometry while the session was locked, and never
when the screen geometry stays the same.

When it happens, one can imagine it's extremely frustrating.


-- System Information:
Debian Release: 10.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-6-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8), LANGUAGE=en_IE:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages xfce4-session depends on:
ii  libatk1.0-0            2.30.0-2
ii  libc6                  2.28-10
ii  libcairo2              1.16.0-4
ii  libdbus-1-3            1.12.16-1
ii  libdbus-glib-1-2       0.110-4
ii  libfontconfig1         2.13.1-2
ii  libfreetype6           2.9.1-3
ii  libgdk-pixbuf2.0-0     2.38.1+dfsg-1
ii  libglib2.0-0           2.58.3-2+deb10u1
ii  libgtk2.0-0            2.24.32-3
ii  libice6                2:1.0.9-2
ii  libpango-1.0-0         1.42.4-7~deb10u1
ii  libpangocairo-1.0-0    1.42.4-7~deb10u1
ii  libpangoft2-1.0-0      1.42.4-7~deb10u1
ii  libpolkit-gobject-1-0  0.105-25
ii  libsm6                 2:1.2.3-1
ii  libwnck22              2.30.7-6
ii  libx11-6               2:1.6.7-1
ii  libxfce4ui-1-0         4.12.1-3
ii  libxfce4util7          4.12.1-3
ii  libxfconf-0-2          4.12.1-1
ii  xfce4-settings         4.12.4-1
ii  xfconf                 4.12.1-1

Versions of packages xfce4-session recommends:
ii  dbus-x11           1.12.16-1
ii  libpam-systemd     241-7~deb10u1
ii  light-locker       1.8.0-3
ii  systemd-sysv       241-7~deb10u1
ii  upower             0.99.10-1
ii  x11-xserver-utils  7.7+8
ii  xfdesktop4         4.12.4-2
ii  xfwm4              4.12.5-1

Versions of packages xfce4-session suggests:
pn  fortunes-mod  <none>
ii  sudo          1.8.27-1

-- no debconf information

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