I have had some troubles recently using btrfs with kernels >=4.8 when
using the cfq scheduler.
Please see my post: http://www.spinics.net/lists/linux-btrfs/msg63599.html
I have no problem with kernels < 4.8 or when using the deadline
scheduler (or none).
It is possible that the problem I see is a result of a major redesign
that happened in March 2016.
So, contrary to most people advising to use very recent kernels, I
suggest to try and strike a balance between a kernel that is recent
enough to have known bugs fixed but old enough that any recently
introduced change has been around for a while and tested.
Regards,
Luca
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