CIFS on 22.04 LTS - has something changed between kernel 5.15.0-101-generic and 5.15.0-102-generic?

I have an Ubuntu 22.04 client connected via CIFS to an Ubuntu 22.04 server.

The mounts are done via an fstab entry similar to:

//machine.fqdn/sharename /mnt/some.directory cifs rw,credentials=/root/some.file,uid=1000,gid=1000,file_mode=0777,dir_mode=0777

I've updated both systems just now from 5.15.0-101-generic kernels to 5.15.0-102-generic .The upgrade of the client seems to break the automatic mount. Instead of the expected information, df returns:

df: /mnt/some.directory: Resource temporarily unavailable

instead of the expected:

//machine.fqdn/sharename    61608748 16429164  45179584  27% /mnt/some.directory

If I reboot the client off the previous 5.15.0-101-generic kernel all is well again.

This seems to be similar to the problem described at https://www.reddit.com/r/Ubuntu/comments/1bzshdt/ubuntu_2204_smb_shares_stopped_working_lastnight/?rdt=37907 , although there is no solution there yet. With the problem kernel in place, attempted access to the share is "somewhat unreliable" - access via smbclient is mostly OK, but mounting via an fstab entry is not. With the problematic kernel, the /etc/fstab entries in place and the disks not mounted, "mount /mnt/some.directory" returns no errors.

Is this some sort of known issue, or a documented change (perhaps to mount parameters) in kernel 5.15.0-102-generic ?