Red Hat Bugzilla – Bug 119036
Gnome logout tries to start xserver on new display
Last modified: 2015-01-07 19:07:38 EST
Description of problem:
Every time I log out of gnome I get the
"There already appears to be an X server running on display :0. Should
I try another display number?..."
message. Selecting 'No' restarts the xserver on :0 with no problem.
Version-Release number of selected component (if applicable):
Happens every time on two different machines, with different video
cards. /etc/X11/XF86Config has
VendorName "Videocard vendor"
BoardName "NVIDIA GeForce 2 GTS (generic)"
for one machine and
VendorName "Videocard vendor"
BoardName "Matrox Millennium G200"
for the other. Happens to other users too, so not due to any
Steps to Reproduce:
1. Gnome login
Error message reporting existing xserver on display :0.
Restarts xserver on :0 with no error message.
Created attachment 98949 [details]
1. This problem also occurs when logging out of a KDE session.
2. This problem does NOT occur when logging out of a 'failsafe' session.
3. I have modified gdm.conf slightly (attached), but since KDE also
has problem, this seems unlikely to be culprit.
4. I see this on 5 different machines, i.e. all I have with RHEL3.
5. No machines with RH9, but similar configs, have this problem.
cp /etc/X11/gdm/factory-gdm.conf /etc/X11/gdm/gdm.conf
does not fix problem. Date of /etc/X11/gdm/factory-gdm.conf is Sep 2
The problem only occurs with usernames obtained from ldap, not
/etc/passwd. In addition, removing the
session optional /lib/security/pam_ldap.so
line from the pam file fixes the problem. Some observations:
1. I do not know if this is a bug (probably in pam_ldap, perhaps it
should be reassigned), or a configuration error.
2. The problem has not always existed. Although I can't recall exactly
when the problem arose, there has been a fairly recent update to nss_ldap.
2. I don't see any messages logged that shed light on the problem.
3. I can't find any docs on what pam_ldap does as a session module.
Perhaps it is not needed.
Suggestions for further tests welcome.
Adding pam maintainer for comment/feedback.
It's probably bug http://bugzilla.padl.com/show_bug.cgi?id=142
CCing nalin as he's the owner of nss/pam_ldap.
Can you check if nss_ldap-207-15 from
http://people.redhat.com/nalin/test/ resolves this? It incorporates
the fix for the upstream bug to which Tomas points, and would shed
some light on whether or not it's the trigger.
This does not sound like an X server or video driver problem at all, in
particular looking at comment #4 through #7. Reassigning to pam
This bug is filed against RHEL 3, which is in maintenance phase.
During the maintenance phase, only security errata and select mission
critical bug fixes will be released for enterprise products. Since
this bug does not meet that criteria, it is now being closed.
For more information of the RHEL errata support policy, please visit:
If you feel this bug is indeed mission critical, please contact your
support representative. You may be asked to provide detailed
information on how this bug is affecting you.