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Description of problem:
   When a user logs out of a GUI session, 3 file descriptors are left behind, which do not dissipate. This, should the system not be rebooted, will inevitably lead to GDM crashing due to "Too many open files".

Version-Release number of selected component (if applicable):
gdm-3.28.3-29

How reproducible:
Consistent.

Steps to Reproduce:
1.Login and Logout a considerable number of times.
2.On default configuration, about 350 logins can cause the issue to occur.

Actual results:
3 file descriptors are left behind on logout.

Expected results:
No file descriptors are left behind on logout.

Additional Information:
Customer also had XDMCP configured on system, but confirmed it happens no matter how you login.

Created attachment 1714599 [details]
Customer reproducer

Unable to reproduce with customer reproducer with gdm-3.28.3-34.el8.x86_64 package.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: GNOME security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:4451