Hi,

On a customer cluster, we noticed that Lustre client cache directory information is not updated when directory owner or access mode changes.

If a user tries to change owner/group or directory mode and then looks for the change from another node, the change is not visible. Moreover, the more we look, the more the cache update is delayed.

We were suspecting troubles related to LU-3671, but we checked that sync_permission is set to 1.

This problem is easy to reproduce:
Node 1 : make directory
with umask 0027
mkdir <lustre filesystem>/<new directory>

Node 2 : add directory in node2 cache
cd <lustre filesystem>/<new directory>
ls -lia

Node 1 : update directory
chmod 770 <lustre filesystem>/<new directory>
or
chown
or both

Node 2 : look for the change
ls -lia (don't wait more than 10s)

Thanks,
Sebastien.