auto_private_groups does not create cache in IPA server SSSD cache

What were you trying to do that didn't work?

It took about 1 minutes to resolve trusted AD users in IdM client, which prevent them from login before the users are resolved.

While IPA server have no problem resolving the users, yet the user private groups did not exist in the SSSD cache, which may cause IPA client failed to get the user private group from IPA server, thus IPA client has to query and cache the group itself, causing delay.

% ipa idrange-find
Range name: AD.EXAMPLE.COM_id_range
First Posix ID of the range: 100000
Number of IDs in the range: 200000
...
Range type: Active Directory trust range with POSIX attributes
Auto private groups: hybrid

AD users have following POSIX attribute
uidNumber: 2000
gidNumber: 2000

However, there are no AD group that has gidNumber: 2000

Please provide the package NVR for which bug is seen:

sssd-2.8.2-3.el8_8
ipa-client-4.9.11-5.module+el8.8.0+18146+a1d8660b.x86_64
ipa-server-4.9.11-5.module+el8.8.0+18146+a1d8660b.x86_64

How reproducible:

Always

Steps to reproduce

1. On IPA server
   systemctl stop sssd; rm -fr /var/lib/sss/ {db,mc}

   /*; systemctl start sssd

2. id aduser
3. ldbsearch -H /var/lib/sss/db/cache_idm.example.com name=aduser@ad.example.com

Expected results

group aduser@ad.example.com should appear in SSSD cache

Actual results

group aduser@ad.example.com did not appear in SSSD cache