Date: Fri, 3 Sep 2010 19:41:05 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: David Brodbeck <gull@gull.us> Cc: freebsd-fs@freebsd.org Subject: Re: Weird Linux - FreeBSD/ZFS NFSv4 interoperability problem Message-ID: <697498209.486386.1283557265921.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <AANLkTi=DJA62jKgi5iyAcUjQ16VC07iFp%2BQUpXgbbhpD@mail.gmail.com>
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> (Note: I originally posted this to freebsd-questions, and it was
> suggested I take it here.)
>
> 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.
> - 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.
>
If you email me a packet capture (probably only need a few seconds
when it is the tight loop), I can look at it in wireshark.
Something like "tcpdump -s 0 -w xxx host <client>" run on the server
should do it. Then email me "xxx" as an attachment.
However, I don't know diddly w.r.t. ZFS, so I don't know how much
I'll be able to help?
rick
ps: You either need the correct kernel modules or a kernel built
with "options NFSD" to run the exp. server (which is the one
that does NFSv4).
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