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From: Chris Mason <chris.mason@fusionio.com>
To: Sage Weil <sage@inktank.com>,
        "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
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Message-ID: <20130611162129.4914.54461@localhost.localdomain>
Subject: Re: hang on 3.9, 3.10-rc5
Date: Tue, 11 Jun 2013 12:21:29 -0400
Sender: linux-btrfs-owner@vger.kernel.org
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Quoting Sage Weil (2013-06-11 11:43:30)
> 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.

Everyone here is waiting for the root node, but it isn't immediately
clear who has the lock.  log_one_extent is the most likely suspect, but
I can't see how it would be scheduling with the root lock held.

Could you please sysrq-w?

-chris