Bug#866898: xorg: switching to a VT (with Ctrl-Alt-Fx) hangs entire system

[Julien Cristau <jcristau@debian.org>]

Control: reassign -1 gnome-shell
Control: severity -1 important

On Sun, Jul  2, 2017 at 17:03:46 +0100, Matthew Vernon wrote:

> Package: xorg
> Version: 1:7.7+19
> Severity: serious
> 
> Hi,
> 
> Since upgrading to stretch, I can no longer switch to a VT - if I do
> Ctrl-Alt-F1 the mouse pointer briefly changes back to that of gdm3 (I
> think), then the entire machine locks up solid - unresponsive to ping
> or anything, and I have to power-cycle it.
> 
> The only thing I see in the log at about the relevant time is:
> 
> Jul  1 23:25:54 aragorn kernel: [  164.494985] gnome-session-f[4309]: segfault at 0 ip b71c492d sp bf8128c4 error 4 in libgtk-3.so.0.2200.11[b6ee7000+803000]
> Jul  1 23:25:54 aragorn kernel: [  164.497200] gnome-session-f[4318]: segfault at 0 ip b721a92d sp bfafd844 error 4 in libgtk-3.so.0.2200.11[b6f3d000+803000]
> 
> ...and, when it happened again:
> 
> Jul  1 23:57:54 aragorn kernel: [  444.296161] traps: gnome-shell[4178] trap int3 ip:b62e8e40 sp:bfb24fb0 error:0
> Jul  1 23:57:54 aragorn kernel: [  444.296168]  in libglib-2.0.so.0.5000.3[b629c000+12a000]
> 
> For me, at least, this is entirely reproducible, and makes it
> impossible for me to use my virtual consoles any more (which I use,
> e.g. for root sessions) :(
> 
Reassigning to gnome-shell since that's what seems to be crashing.  And
downgrading since this doesn't seem to be such a common issue.

If this is still happening it might be useful to gather a core dump.

> The manual x.org.conf is carried from previous releases - I still have
> a CRT, so need to tell Xorg about the monitor.
> 
Unless the monitor is 30 years old that shouldn't be necessary.  EDID
dates back to the mid-1990s.

Cheers,
Julien