(In reply to comment #0)
> How reproducible:
> You won't like it...

Oh well. :(

However, more I would like to get more logs. Most of the fun stuff these happens in kernel, and there is nothing kernelish in /var/log/Xorg.0.log. So, please add drm.debug=0x04 to the kernel command line, restart computer, and attach

* your X server config file (/etc/X11/xorg.conf, if available),
* output of the dmesg command, and
* system log (/var/log/messages)

to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above.

We will review this issue again once you've had a chance to attach this information.

Thanks in advance.

Created attachment 422997 [details]
/etc/X11/xorg.conf.d/00-system-setup-keyboard.conf

I don't have an Xorg.conf; this is the only related file, /etc/X11/xorg.conf.d/00-system-setup-keyboard.conf

Created attachment 422998 [details]
dmesg

Created attachment 422999 [details]
/var/log/messages from boot with drm.debug=0x04

(Note that these files were generated with a docking station, the original log is without a docking station; I have seen X crashes in both cases.  I'm afraid the most recent X crash, with a docking station, only contained a "Backtrace" header, but no backtrace.)

Created attachment 423954 [details]
dmesg

I've been experiencing the same issue:
Backtrace:
[  6156.231] 0: /usr/bin/Xorg (xorg_backtrace+0x3c) [0x80e51dc]
[  6156.231] 1: /usr/bin/Xorg (0x8047000+0x5e176) [0x80a5176]
[  6156.231] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xdb640c]
[  6156.232] 3: /lib/libc.so.6 (0x42c000+0x79296) [0x4a5296]
[  6156.232] Segmentation fault at address (nil)
[  6156.232] 
Fatal server error:
[  6156.232] Caught signal 11 (Segmentation fault). Server aborting
[  6156.232] 
[  6156.232] 

And I've got what you asked for (note I don't have any xorg.conf file).

Created attachment 423955 [details]
Xorg.0.log

Created attachment 423960 [details]
messages

Note there's nothing there (I removed dhclient|ntpd|NetworkManager|pulseaudio|pcscd|nscd|gnome-ses|dbus|gdm-simple|gpm|modem-manager)...

The crash happened just before 20:56.

I can easily reproduce this bug by opening tabs in firefox and it's fairly recent because I haven't changed the way I work.  The only things that have changed are updates I've been applying.

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