On Mon, 12 May 2014 18:14:30 +0200,
in 5370F366.7030505@rolffokkens.nl,
Rolf Fokkens [off-list ref] wrote:

So far no problems here, I have been using bcache since october. But
I'm currently running kernel 3.14.3, so I might be at risk?

You might. Independently of this error it may be even riskier if you
are using bcache in writeback mode.

Is this issue there since a specific kernel version?

I'm not sure. My previous kernel was 3.13.11 and it was even worse -
bcache in writeback mode destroyed my filesystem. I escaped from
3.13.11 to 3.14.3 with bcache in writethrough mode, but with this
version the split error occurs. Slava wrote more info on this.
-- 
Mariusz Paradowski