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Message-Id: <1219087173.7192.17.camel@localhost>
Date: Mon, 18 Aug 2008 15:19:33 -0400
From: Trond Myklebust <trond.myklebust@....uio.no>
To: Athanasius <link@...gy.org>
Cc: Grant Coady <gcoady.lk@...il.com>,
linux-kernel <linux-kernel@...r.kernel.org>, neilb@...e.de,
bfields@...ldses.org, linux-nfs@...r.kernel.org
Subject: Re: NFS regression? Odd delays and lockups accessing an NFS
export.
On Mon, 2008-08-18 at 19:50 +0100, Athanasius wrote:
> On Mon, Aug 18, 2008 at 12:02:20PM +1000, Grant Coady wrote:
> > I've been using NFS here for years, lately there's something odd going on
> > since about a month or so. Previously reported last month:
> > http://www.gossamer-threads.com/lists/linux/kernel/951419?page=last
> >
> > Now with 2.6.27-rc3 on one of the client boxes I get a complete stall
> > at odd times when accessing the server's exported directory, cannot
> > see a pattern to it. Eventually recovers after a Ctrl-C. Nothing in
> > the server or client log files. Not easy to reproduce either.
>
> I wonder if this is what I've been seeing. I've been otherwise too
> busy to properly report it, thinking that *someone* else must also be
> seeing it and it's being worked on, else it's a subtle configuration
> problem my end.
Your lockdep trace basically shows that the rpc layer is blocking for
some reason. Could you please try to reproduce the problem, and then do
echo 0 >/proc/sys/sunrpc/rpc_debug
...and see what the output from 'dmesg' shows?
Cheers
Trond
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