gdm won't restart after zapping x

[Colin]

After zapping X (ctrl + alt = backspace) GDM has to manually killed and restarted. I am using the nvidia-glx driver + beryl on Feisty with the latest updates applied.

[Brian Murray (brian-murray)]

The beryl packages are not from the official Ubuntu repositories, and as such are not supported here. Please either report this bug upstream at http://bugs.beryl-project.org/ or try to reproduce the bug without using beryl. Thanks!

[Martin Pool (mbp)]

This happened to me on feisty, and I am not using either nvidia or beryl (or compiz). So I'm reattributing it to gdm.

I had to zap the server because my gnome-panel had crashed. (Well, I guess I could have tried killing the gnome-session instead, but gdm ought to be robust against the server unexpectedly exiting.)

I couldn't seem to get much debugging information, except this from the daemon.log:

Mar 22 09:58:20 hope gdm[5298]: gdm_cleanup_children: child 5306 crashed of sign
al 9
Mar 22 09:58:20 hope gdm[5298]: gdm_cleanup_children: Slave crashed, killing its
 children

gdb shows

(gdb) bt
#0 0xb75f9903 in ?? () from /lib/tls/i686/cmov/libc.so.6
#1 0x080a1410 in ?? ()
#2 0x080934e0 in ?? ()
#3 0x080a1418 in ?? ()

and strace shows it repeatedly

rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0

[Martin Pool (mbp)]

This is reproducible for me at the moment. I should also mention that it's the gdb child process that spins, using 100% of cpu. I can recover by either killing that process, or restarting gdm as a whole.

Here's my X log in case it helps.

[Sebastien Bacher (seb128)]

Thanks for the bug report. This particular bug has already been reported, but feel free to report any other bugs you find.