[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 #2 from Rick Macklem <rmacklem@FreeBSD.org> ---
I'll make a few random comments.
1 - Since the crashes occur at different places, I agree with
    you that it might be a hardware problem.
    It would be nice if you could set up another machine with
    exactly the same software/usage and see if it crashes as well.

2 - You should never use "intr" nor "soft" on NFSv4 mounts. This is
    mentioned in the BUGS section at the end of "man mount_nfs".
    To get rid of a hung NFS mount, use "umount -N <mnt_path>.
    (It can take a couple of minutes, but normally succeeds. Note
     that any file writing that was in progress when you do this
     will get lost.)

3 - If you can still log in and do these when "hung", capture the
    output of:
    # ps axHl
    # procstat -a -kk
    # netstat -a
    # ping <nfs-server>

4 - nfscl_hasexpired() only gets called when the NFS client does not
    get a response from the server for minutes and then gets a
    NFSERR_EXPIRED reply from the server.

You did not mention what NFS server you are using. If it is a FreeBSD 13.0
server, then see PR#256280.

If you get the output from #3, please post it here.

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