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From: Chris Mason <chris.mason@fusionio.com>
To: Jon Nelson <jnelson+btrfs@jamponi.net>, <linux-btrfs@vger.kernel.org>
References: <alpine.DEB.2.00.1306110841550.15858@cobra.newdream.net>
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Subject: Re: hang on 3.9, 3.10-rc5
Date: Thu, 20 Jun 2013 21:11:37 -0400
Sender: linux-btrfs-owner@vger.kernel.org
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Quoting Jon Nelson (2013-06-18 13:19:04)
> Josef Bacik <jbacik <at> fusionio.com> writes:
> 
> > 
> > On Tue, Jun 11, 2013 at 11:43:30AM -0400, Sage Weil wrote:
> > > I'm also seeing this hang regularly with both 3.9 and 3.10-rc5.  Is this 
> > > is a known problem?  In this case there is no powercycling; just a regular 
> > > ceph-osd workload.
> 
> ..
> 
> 
> I'm able to cause a complete kernel hang by defrag'ing even one 
> file on 3.9.X (3.9.0 through 3.9.4, so far).

I'm not able to reproduce this here.  Could you please capture the
output from sysrq-w during the hang?  (It will all go to your dmesg)

-chris