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Re: BUG: soft lockup - is this XFS problem?

To: Nick Piggin <npiggin@xxxxxxx>
Subject: Re: BUG: soft lockup - is this XFS problem?
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Sat, 3 Jan 2009 16:44:43 -0500
Cc: Peter Klotz <peter.klotz@xxxxxx>, Roman Kononov <kernel@xxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20081230042333.GC27679@xxxxxxxxxxxxx>
References: <gifgp1$8ic$1@xxxxxxxxxxxxx> <20081223171259.GA11945@xxxxxxxxxxxxx> <20081230042333.GC27679@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)
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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