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

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: BUG: soft lockup - is this XFS problem?
From: Nick Piggin <npiggin@xxxxxxx>
Date: Tue, 30 Dec 2008 05:23:33 +0100
Cc: Roman Kononov <kernel@xxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20081223171259.GA11945@xxxxxxxxxxxxx>
References: <gifgp1$8ic$1@xxxxxxxxxxxxx> <20081223171259.GA11945@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.9i
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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