[Bug 282156] page fault while in kernel mode after 14.0-Release to 14.1-Release upgrade

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282156

--- Comment #9 from Rick Macklem <rmacklem@FreeBSD.org> ---
(In reply to Rick Macklem from comment #8)
OK, I got the packet traces. It appears that
the server is doing a CB_RECALL_ANY (which is
not currently supported by the client) and that
is causing the crash.

It looks like the code should reply NFSERR_NOTSUPP,
so I cannot spot an obvious bug.

I do not currently have a server that does this
callback, but I should be able to hack one to-gether
to do testing with. I really should implement the
callback.

Not sure why 14.0 works and 14.1 does not?

If you need to upgrade to 14.1, you could try a
couple of workarounds:
1 - Try running the client without the nfscbd daemon
    (Just delete the nfscbd_enable="YES" line from
     /etc/rc.conf and reboot it.)
or
2 - Use NFSv4.0 by specifying minorversion=0 on the
    mount command line. (It is possible that the default
    might have been 0 for 14.0. That would explain why
    the crash occurs on 14.1, but not 14.0.)
If you do:
# nfsstat -m
on the 14.0 client, it will show you what minor version
it is using.

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