I've CCd kernel package maintainer Stefan Bader also.
I've seen this problem on a customer machine also with current linux-image hwe-18.04 (5.4.0.91) kernels. Directories with nounix mount option are empty.
Previous 5.4.0.89 seems to have issues *with* unix extensions here though, that one wan not able to mount at all if the unix mount option is added.
The current bug with "successful" but empty cifs mounts is worse though.
I've CCd kernel package maintainer Stefan Bader also.
I've seen this problem on a customer machine also with current linux-image hwe-18.04 (5.4.0.91) kernels. Directories with nounix mount option are empty.
Previous 5.4.0.89 seems to have issues *with* unix extensions here though, that one wan not able to mount at all if the unix mount option is added.
The current bug with "successful" but empty cifs mounts is worse though.