Those of you who are seeing similar problems; could you try to get a
core dump and a full stack trace?
Here's how I managed to do it:
1. Prevent X from trapping SIGSEGV by putting the following in
/usr/share/X11/xorg.conf.d/00-no-trap-signals.conf:
Section "ServerFlags"
Option "NoTrapSignals" "true"
EndSection
2. Tell X to dump core by adding the following to the [SeatDefaults]
section of /etc/lightdm.conf:
xserver-command=X -core
3. Make sure the X is allowed to dump core:
- log out from your session
- switch to another VT (ctrl-alt-f1)
- sudo stop lightdm
- ulimit -c unlimited
- sudo lightdm
4. Check that the changes kicked in:
$ ps -fp $(pidof X)
UID PID PPID C STIME TTY TIME CMD
root 16043 6885 1 08:44 tty7 00:01:34 /usr/bin/X -core :7 -auth
/var/run/lightdm/root/:7 -nolisten tcp vt7 -novtswitch
$ cat /proc/$(pidof X)/limits | grep core
Max core file size unlimited unlimited bytes
$
5. Switch back to VT7, log in and wait for X to crash again.
6. To get meaningful stacktraces, you'll want debug symbols installed
for X and friends (adjust for different video drivers):
sudo apt-get install libc6-dbg xserver-xorg-core-dbg
xserver-xorg-video-intel-dbg
7. If/when X crashes, check for /etc/X11/core. If it exists, copy it to your
home dir and run:
gdb /usr/bin/Xorg core
8. In gdb, say "bt full" to get a stacktrace.
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https://bugs.launchpad.net/bugs/1026777
Title:
Xorg segfault: kicks out to login screen
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