Date: Tue, 30 Dec 2008 05:23:33 +0100
From: Nick Piggin <npiggin@suse.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Roman Kononov <kernel@kononov.ftml.net>, linux-kernel@vger.kernel.org,
       xfs@oss.sgi.com
Subject: Re: BUG: soft lockup - is this XFS problem?
Message-ID: <20081230042333.GC27679@wotan.suse.de>
References: <gifgp1$8ic$1@ger.gmane.org> <20081223171259.GA11945@infradead.org>
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On Tue, Dec 23, 2008 at 12:12:59PM -0500, Christoph Hellwig wrote:
> 
> Nick, I've seen various reports like this by Roman.  It seems to be
> caused by an interaction of the lockless pagecache with the xfs
> I/O code.  Any idea what might be wrong here:

Hmm, it could get into a loop here if there is a page in the pagecache
with a zero refcount, which might be a problem with XFS... other looping
conditions might indicate a problem iwth lockless pagecache or radix
tree. It would be very helpful to know what condition it is looping on...

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