[Bug 260664] ZFS/NFS: Intermittent hangs and crashes after a period of time in: nfscl_hasexpired || dbuf_write_done || zio_execute

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260664

--- Comment #10 from Rick Macklem <rmacklem@FreeBSD.org> ---
Would it be possible for you to upgrade your kernel from
the sources for stable/13?

There is a patch in stable/13 that fixed a problem where
open/create would defer to an exclusive lock request and
cause a deadlock.
It is commit 701eb03cc0dc in stable/13, but I do not know
if it will apply to 13.0 kernel sources cleanly?

I thought this could only occur when delegations were being
issued by the server and, since you are not running nfscbd(8),
delegations should never be issued to the client, even for
non-FreeBSD servers.

You never mentioned what NFS server you are using. If it is
a FreeBSD one, make sure delegations are not enabled.
The sysctl vfs.nfsd.enable_delegations should be set to 0
on the server.

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