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Date: Mon, 23 Sep 2013 10:57:00 -0400
From: Josef Bacik <jbacik@fusionio.com>
To: Tomasz Chmielewski <mangoo@wpkg.org>
CC: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: btrfs: qgroup scan failed with -12
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On Mon, Sep 23, 2013 at 07:43:44AM +0700, Tomasz Chmielewski wrote:
> Not sure if it's anything interesting - I had the following entry in
> dmesg a few days ago, on a server with 32 GB RAM. The system is still working fine.
> 

Can you try the patch here

https://bugzilla.kernel.org/attachment.cgi?id=107408&action=diff

and see if that helps?  Thanks,

Josef