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Date: Wed, 17 Oct 2007 16:55:24 +0100
From: Christoph Hellwig <hch@infradead.org>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Peter Zijlstra <peterz@infradead.org>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] nfs: fix nfs_writepage()
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On Wed, Oct 17, 2007 at 11:47:54AM -0400, Trond Myklebust wrote:
> Put differently:
>       * _who_ is dirtying the page when the swapper is trying to write
>         the page out?
>       * why are they not calling either page_mkwrite() or
>         commit_write()?

Apparently Peter has some broken patches in his tree that cause this.
It can for sure not happen in mainline and that's absolutely intentional.