Re: [gdm-list] FailsafeXServer - gdm keeps restarting X

[Brian Cameron <Brian Cameron Sun COM>]

Bryce:

The Xserver interface expects that a USR1 signal will be sent to the
parent process to let it know that the Xserver is up and running
and ready to be used.  You should send a "kill -USR1 pid" to the
slave daemon.  Or perhaps this signal is being sent to your script
and you could just propagate it, perhaps your script is consuming
it.  You may need a signal handler to do this.  Though I'm not sure
how you handle signal handlers in shell scripts.  You could probably
do it in Perl or something, though.

For example:

   http://www.realvnc.com/pipermail/vnc-list/2000-March/012897.html

Brian


> On Tue, Aug 28, 2007 at 04:07:20PM -0500, Brian Cameron wrote:
> > Bryce:
> >
> > Looking at the logs, it seems that every time GDM tries to start an
> > XServer that it is hitting the following error:
> >
> > Aug 28 12:04:12 dorset gdm[5348]: WARNING: gdm_slave_xioerror_handler: 
> > Fatal X error - Restarting :0
>
> No, those are actually intentional failures I'm injecting to trigger the
> failsafe mode.  Those are just caused by my invalidating the xorg.conf.
>
> It looks like the real issue occurs later on:
>
> Aug 28 12:04:17 dorset gdm[5375]: DEBUG: gdm_server_spawn: '/etc/gdm/failsafeXServer :0 -auth /var/lib/gdm/:0.Xauth -nolisten tcp vt7
> Aug 28 12:04:17 dorset gdm[5369]: DEBUG: gdm_server_spawn: Forked server on pid 5375
> Aug 28 12:04:17 dorset gdm[5369]: DEBUG: do_server_wait: Before mainloop waiting for server
> Aug 28 12:04:17 dorset gdm[5369]: DEBUG: Attempting to parse key string: daemon/GdmXserverTimeout=10
> Aug 28 12:04:28 dorset last message repeated 4 times
> Aug 28 12:04:28 dorset gdm[5369]: DEBUG: do_server_wait: Server timeout
> Aug 28 12:04:28 dorset gdm[5369]: DEBUG: gdm_server_start: After mainloop waiting for server
> Aug 28 12:04:28 dorset gdm[5369]: DEBUG: gdm_server_start: Temporary server failure (:0)
>
> It looks to me like gdm has successfully launched the failsafeXServer
> but doesn't realize it.  It's waiting for some sort of signal from the
> failsafe server in do_server_wait(), that I guess isn't getting sent?
>
> Is there some sort of signal I need to have the failsafeXServer send
> back to gdm?  If so, how is this done?
>
> Also note I'm not doing any of the X authentication - is something
> dependent on having the auth keys set up?
>
> Thanks,
> Bryce