After updating the kernel and using btrfs-progs-git from the AUR, I'm now 
getting this output. Does this yield any new insight?

[  473.305408] btrfs: failed to read tree root on dm-2
[  473.305555] BTRFS critical (device dm-2): unable to find logical 
1781900460032 len 4096
[  473.305591] BTRFS emergency (device dm-2): No mapping for 
1781900460032-1781900464128


On 22.08.2013, at 10:09, Mitch Harder <[email protected]> wrote:

> On Thu, Aug 22, 2013 at 1:47 AM, Nicholas Lee <[email protected]> wrote:
> 
>> [   45.914275] ------------[ cut here ]------------
>> [   45.914406] kernel BUG at fs/btrfs/volumes.c:4417!
>> [   45.914489] invalid opcode: 0000 [#1] PREEMPT SMP
> 
> I can't say if this will fix your problem or not, but the 3.10.x
> kernel has a patch to pass this error back instead of halting with a
> BUG() at this point.

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