3.18.3 + latest bcache-dev

["Stephen R. van den Berg" <srb@cuci.nl>]

I have:
16GB RAM
16GB SSD swap
5 x 6TB HDD bcache backing storage
2 x 490GB SSD bcache cache (Crucial M550, 4KB block, 2M bucket size)
writeback and trim enabled on bcache.
I used the latestbcache tools from git.

On the backing storage, I created a BTRFS using nossd and notrim.

Now, whenever I boot, I end up with exactly 4 bcache_writebac
processes pegged at  99 or 100% CPU.  This is on an octocore cpu.
top shows it as 50% system time.  The four processes are marked as R,
but I cannot trace them.

Even after waiting for several minutes, the cpu load does not come down.
The mounted volume simply seems to work, though.

Any ideas?
-- 
Stephen.