[REGRESSION]: NFS 4.2 reports "Operation Not Supported" on getxattr calls

[Scott Haiden <scott.b.haiden@gmail.com>]

Hello,
Between version v6.16.1 and v6.16.2 on the stable tree, NFS client 
started reporting operation not supported when I issue getxattr calls. I 
simply see:     $ strace -e getxattr getfattr -n user.hash.sha512 
'S01E01 - Kassa.mkv'     getxattr("S01E01 - Kassa.mkv", 
"user.hash.sha512", NULL, 0) = -1 EOPNOTSUPP (Operation not supported)   
   S01E01 - Kassa.mkv: user.hash.sha512: Operation not supported     +++ 
exited with 1 +++
Before this issue cropped up, it simply returned the xattr as expected.

I did a git bisect between those two changes on the stable tree, and
found that the backport of this change 
(https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b01f21cacde9f2878492cf318fee61bf4ccad323 
<https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b01f21cacde9f2878492cf318fee61bf4ccad323>)
onto the stable tree is what caused it to start happening. The 6.12
longterm repo is also affected.
I built mainline 6.17-rc3 and it was still facing the issue as of last 
night, but if I patch a reverse diff of that change on then getxattr 
calls work again.
Please let me know if there's more information I should provide, or if
I'm just doing something wrong.
Thanks,
--Scott