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Re: 2.6.39-rc3, 2.6.39-rc4: XFS lockup - regression since 2.6.38

To: linux-kernel@xxxxxxxxxxxxxxx, Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>, Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>, xfs-masters@xxxxxxxxxxx, xfs@xxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Alex Elder <aelder@xxxxxxx>, Dave Chinner <dchinner@xxxxxxxxxx>
Subject: Re: 2.6.39-rc3, 2.6.39-rc4: XFS lockup - regression since 2.6.38
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 4 May 2011 23:25:52 +1000
In-reply-to: <20110504005736.GA2958@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <20110423224403.5fd1136a@xxxxxxxxxxxx> <20110427050850.GG12436@dastard> <20110427182622.05a068a2@xxxxxxxxxxxx> <20110428194528.GA1627@xxxxxxxxxxxxxx> <20110429011929.GA13542@dastard> <20110504005736.GA2958@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Wed, May 04, 2011 at 12:57:36AM +0000, Jamie Heilman wrote:
> Dave Chinner wrote:
> > OK, so the common elements here appears to be root filesystems
> > with small log sizes, which means they are tail pushing all the
> > time metadata operations are in progress. Definitely seems like a
> > race in the AIL workqueue trigger mechanism. I'll see if I can
> > reproduce this and cook up a patch to fix it.
> 
> Is there value in continuing to post sysrq-w, sysrq-l, xfs_info, and
> other assorted feedback wrt this issue?  I've had it happen twice now
> myself in the past week or so, though I have no reliable reproduction
> technique.  Just wondering if more data points will help isolate the
> cause, and if so, how to be prepared to get them.

Not really. I think I know where the problem lies, but I currently
lack a reproducer. There's also been another regression I've only
just got to the bottom of, so I haven't really had a chance to focus
properly on this one yet. Log space hangs like this have
historically been difficult to reproduce reliably....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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