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

To: Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
Subject: Re: 2.6.39-rc3, 2.6.39-rc4: XFS lockup - regression since 2.6.38
From: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Date: Sat, 30 Apr 2011 16:18:10 +0200
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, xfs-masters@xxxxxxxxxxx, xfs@xxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Alex Elder <aelder@xxxxxxx>, Dave Chinner <dchinner@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
In-reply-to: <20110429213524.449e003b@xxxxxxxxxxxx>
References: <20110423224403.5fd1136a@xxxxxxxxxxxx> <20110427050850.GG12436@dastard> <20110427182622.05a068a2@xxxxxxxxxxxx> <20110428194528.GA1627@xxxxxxxxxxxxxx> <20110429011929.GA13542@dastard> <20110429151841.GA893@xxxxxxxxxxxxxx> <20110429213524.449e003b@xxxxxxxxxxxx>
On Fri, 29 April 2011 Bruno Prémont wrote:
> On Fri, 29 April 2011 Markus Trippelsdorf wrote:
> > On 2011.04.29 at 11:19 +1000, 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.
> > 
> > Hmm, I'm wondering if this issue is somehow related to the hrtimer bug,
> > that Thomas Gleixner fixed yesterday:
> > http://git.us.kernel.org/?p=linux/kernel/git/tip/linux-2.6-tip.git;a=commit;h=ce31332d3c77532d6ea97ddcb475a2b02dd358b4
> > http://thread.gmane.org/gmane.linux.kernel.mm/61909/
> > 
> > It also looks similar to the issue that James Bottomley reported
> > earlier: http://thread.gmane.org/gmane.linux.kernel.mm/62185/ 
> 
> I'm going to see, I've applied Thomas' fix on the box seeing XFS freeze 
> (without
> other changes to kernel).
> Going to run that kernel for the week-end and beyond if it survives to see 
> what
> happens.

Happened again (after a few hours of uptime), so it definitely is not
caused by hrtimer bug that Thomas Gleixner fixed.

Bruno

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