Red Hat Bugzilla – Bug 419381
gnome-session crashes with XDMCP login
Last modified: 2009-01-09 00:28:44 EST
Description of problem:
Remote login to a Fedora 8 system, with Xming from Windows XP, results in an
immediate crash of the gnome session, just after the (successful) login.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Setup XDMCP access
Connect from remote, using a X11 server like Xming, to the target
Session appears for about 1 second (more or less, depending on network
conditions and so on...), then the connection is lost and the local X11 server
(Xming) closes down.
Well, the session should start, as it was doing with Fedora 7...
It seems there are some bugs, in Fedora 8, GNOME, Ubuntu about a gdm problem,
see for example bug #379511 and bug #403961, which may resemble the situation here.
I do not know if gdm has a bug, but in this case the following (differential)
diagnosis ruled out gdm alone (even if it may still be guilty, see below):
1) Forcing xdm did not improve the situation.
2) Changing (from within gdm) to kde resulted in a proper login.
So, I guess gnome-session is just crashing for some (unknown) reasons.
One error reported in /var/log/messages is:
[date host] gdm-binary[pid]: WARNING: gdm_slave_xioerror_handler: Fatal X error
- Restarting [ip:screen]
Which may lead to the conclusion that gdm could be involved...
After some updates (but I cannot trace back which one) it seems now possible to
access the remote machine with gnome.
The problem is not completely gone, since the process takes ages (several
minutes) to finish.
It seems there could be something related to pulseaudio, which cannot access any
audio device (of course, there aren't, since we're in remote X connection).
Created attachment 293135 [details]
log file on the server side when an attempt to open a session on the X-terminal
same problem to access X-terminal from a RHEL5-application-server with xdmcp
with a RHEL4-application-server all is fine on the same X-terminal
on the RHEL5-application server :
- [xdmcp] Enable=true in the /etc/gdm/custom.conf
- no firewall ; no iptables; no ipchains
"nmap -sU" localhost shows 177/udp open
- [debug]Enable=true in /etc/gdm/custom.conf
gives nothing clear :
see the attach file xdmcp.log
on the X-terminal side :
- an X error log with warnings just the same as from a RHEL4
- the chooser menu shows the RHEl5-server
- when I try to open the session
one second wait ; then the X error message ...
- on the RHEL5-application-server :
export DISPLAY=eon37.ceremade.dauphine.fr:0;(xeyes)& ; is OK
(gdmgreeter:2074): Gtk-CRITICAL **: gtk_tree_view_get_selection:
assertion `GTK_IS_TREE_VIEW (tree_view)' failed
export DOING_GDM_DEVELOPMENT=yes ; (/usr/libexec/gdmgreeter) &
is OK !
I try to change :
without any result
this is a great problem for me ; I have 40 X-terminal and five RHEL4 servers
that I want to upgrade to RHEL5 ; without the solution to this problem I should
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