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Date: Tue, 19 Nov 2013 13:36:43 +0200
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Subject: Re: Warning in record_one_backref()
From: Emil Karlson <jekarlson@gmail.com>
To: Pedro Fonseca <pfonseca@mpi-sws.org>,
        Linux Btrfs <linux-btrfs@vger.kernel.org>
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On Tue, Nov 19, 2013 at 1:00 PM, Pedro Fonseca <pfonseca@mpi-sws.org> wrote:
> Hi,
>
> In another test, I've encountered a few situations that triggered a warning
> message in "record_one_backref()". I'm not sure if it's serious but it is
> probably related to the concurrent defragment operations executed during the
> test.
>
I think You'll need this patch or later linux-3.11 or linux-3.12

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=50f1319cb5f7690e4d9de18d1a75ea89296d0e53