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Created attachment 1024721 [details]
sosreport

Description of problem:
- 58000 entries in /etc/passwd and over 1200 in /etc/group.
The account-daemon, gnome-shell, and gnome-initial-setup process are all consuming large amounts of CPU and memory as they try to load all of those entries.  In addition, it appears that they're trying to iterate over all of the home directories looking for .face files.

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


How reproducible:
- 100%

Steps to Reproduce:
1. build a machine with 58000 user accounts that authenticate to active directory
2. attempt to boot machine to the GUI
3.

Actual results:
- account-daemon, gnome-shell and gnome-initial-setup consume the CPU

Expected results:
- no issues

Additional info:
- sosreport attached
- nsswitch.conf configuration issue has been corrected by no longer calling sssd
From:

passwd:     files sss
shadow:     files sss
group:      files sss
services:   files sss
netgroup:   files sss

To: 

passwd:     files 
shadow:     files 
group:      files 
services:   files 
netgroup:   files

Upstream bugs:
https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/941673
https://utcc.utoronto.ca/~cks/space/blog/linux/UbuntuAccountsServiceProblems

I did a few changes here that should make it perform much better in a variety of large user deployments.

Unable to reproduce with accountsservice-0.6.35-12.el7.x86_64

*** Bug 1302349 has been marked as a duplicate of this bug. ***

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, 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://rhn.redhat.com/errata/RHBA-2016-2522.html