Red Hat Bugzilla – Bug 431852
gdm 2.20.2/3 ignores MaxSessions value
Last modified: 2015-01-14 18:20:22 EST
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Description of problem:
I have a fresh install of F8. MaxSessions is set to 100 in /etc/gdm/custom.conf and also in /usr/share/gdm/defaults.conf. However, gdm still rejects connections above about 16 with:
gdm-binary: WARNING: Maximum number of open XDMCP sessions reached
Upgrading to 2.20.3 in the updates testing repo gets rid of those messages in the log, but the when the number of connections reaches about 16, additional connections are rejected. I'm not certain that the number is exactly 16, but it is in that vicinity. No more than 20.
There were actually a couple of different problems with similar symptoms in 2.20.1 back around November 2007.
When I try to hard code the value to higher and recompile the package, ./configure fork bombs with pkg-config processes. I'll present more detailed information on that later in another bug report.
Version-Release number of selected component (if applicable):
2.20.2 and 2.20.3
Steps to Reproduce:
1. Install F8
2. Set maximum sessions to 100 in gdmsetup
3. Confirm the changes were made to the config file.
4. Tell your 70 users that they can log in now.
Connections above about 16 were rejected.
gdm should accept up to 100 connections.
I just noticed I have a typo in the subject. Just to be clear, I am using
MaxSessions as the key and not MxSessions. Also, the fork bomb problem on build
went away and I have a special version compiled with MaxSessions hardcoded to
100. Did a gdm-safe-restart and probably won't be certain whether it works
until after close of business today.
Well, my new rpm in which I hardcoded Maxsessions=100 into
daemon/gdm-daemon-config-keys.h still rejects clients at about the same number
and emits the maximum sessions reached message. I'm stumped. There have been two
recent (oct/nov 2007) issues which might relate. One in which the config files
were not being honored for certain config keys. And another where the counter
was not getting decremented properly. I know the latter is not the case here,
since I have only about 18 users doing xdmcp sessions. Everyone else is using
NX. And the former should have been worked around by my hardcoding the values.
This is a fresh 64 bit install. It seems odd that no one else has reported
Turning on debug I see that Maxsessions is always 16. The session count seems
to increment and decrement properly, so the only problem seems to be MaxSessions
being stuck at 16.
#define DEFAULT_MAX_DISPLAYS 64
in daemon/gdm-xdmcp-manager.c and recompiling *does* give me 64 sessions. So
that's a work around, and perhaps a clue as to where the real problem is. I'm a
bit confused, since I thought all this got hashed out and fixed upstream in
2.20.2 months ago. But downloading the vanilla source from upstream and
compiling yielded the same broken behavior.
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