linux-kernel - Re: NFS BUG_ON in nfs_do

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Message-Id: <1240582459.4946.31.camel@heimdal.trondhjem.org>
Date:	Fri, 24 Apr 2009 10:14:19 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Rince <rincebrain@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: NFS BUG_ON in nfs_do_writepage

On Fri, 2009-04-24 at 05:26 -0400, Rince wrote:
> Applied try 3 of Nick Piggin's patch to 2.6.30-rc3 (cleanly, no less!)
> 
> Doesn't appear to have helped at all - I received my favorite BUG ON
> write.c:252 just like always, within 24 hours of booting the kernel,
> even.
> 
> - Rich

Yes. I'm able to reproduce this bug now. I found that I can trigger it
fairly reliably by running iozone in something like the following
configuration: "iozone -t 32 -r 1k -s 256m -c -D -K -Z -i0 -i8"

I believe it boils down to the problems being discussed in the following
thread:
   http://thread.gmane.org/gmane.linux.nfs/26181

Cheers
  Trond

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