Comment 1 for bug 1899968

Can you clarify one scenario that reproduces the problem, being explicit about what the server is, and the client? cifs-utils (and the kernel?) could very well be involved here. Also the server share config please. Or can you show the bad/good behavior by just by switching servers, and keeping the same client?

It also may matter which SMB protocol was used for the mount, as defaults have changed. To be honest, I'm suspecting it's unix extensions that are not being used, since the default cifs mount option changed from SMB1 (deprecated nowadays) to SMB2 and higher, and unix extensions are not yet available for these higher protocol versions.

To see which version was selected, you can type "mount -t cifs" or check dmesg right after a mount was done.