linux-kernel - Re: BUG: soft lockup

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Message-ID: <20090103214443.GA6612@infradead.org>
Date:	Sat, 3 Jan 2009 16:44:43 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Peter Klotz <peter.klotz@....at>,
	Roman Kononov <kernel@...onov.ftml.net>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: BUG: soft lockup - is this XFS problem?

On Tue, Dec 30, 2008 at 05:23:33AM +0100, Nick Piggin wrote:
> 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...

See http://oss.sgi.com/bugzilla/show_bug.cgi?id=805
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