Weird Linux - FreeBSD/ZFS NFSv4 interoperability problem

David Brodbeck gull at
Fri Sep 3 15:57:34 UTC 2010

Thanks, Ivan.  I'll pursue it there.

If it's not ready for prime time yet, I understand, but I'd also like
to help nudge it in that direction. :)

On Fri, Sep 3, 2010 at 2:57 AM, Ivan Voras <ivoras at> wrote:
> On 09/02/10 21:25, David Brodbeck wrote:
>> While doing some interoperability testing between Linux and FreeBSD, I
>> came up with this unusual issue.  I could use some help figuring out
>> if this is a bug, and if so, where to file it.  Here's the scenario:
>> - FreeBSD 8.1-RELEASE server, sharing a ZFS filesystem via NFSv4.
> I think that this is the beginning of your problems - even the developer who
> is working on NFSv4 says it's too experimental to be used in real world.
>> - Linux client (I've tested with RHEL 5.4 and Debian Lenny) mounting
>> said filesystem with NFSv4.
>> - A user on the Linux client does a Subversion checkout onto the
>> mounted filesystem.
>> At the end of the checkout, access to the filesystem hangs.  nfsd on
>> the FreeBSD server and rpciod on the Linux client seem to be in a
>> tight loop, and there's lots of network traffic between them.  I can
>> reproduce this every time.
>> The problem does not occur if the backing filesystem is UFS instead of
>> ZFS, if NFSv3 is used instead of NFSv4, or if the client is FreeBSD
>> instead of Linux.
> ... but you may have stumbled on something specific. I recommend you repeat
> this same post (and others you have on the similar topic) on the freebsd-fs
> at mailing list, the developer (Rick Macklem) reads it.
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