Help diagnosing kworker 'bug'

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Yesterday night I noticed (just before performing an update my conky
showing high continuous writing to root. iotop -Pa shows this:-

Total DISK READ :       0.00 B/s | Total DISK WRITE :       8.93 M/s
Actual DISK READ:       0.00 B/s | Actual DISK WRITE:      11.06 M/s
  PID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
  112 be/4 root          0.00 B     64.91 M  0.00 % 24.34 % [kworker/u16:3]
11936 be/4 root          0.00 B      0.00 B  0.00 %  0.06 % [kworker/1:1]
28794 be/4 root          0.00 B     36.00 K  0.00 %  0.00 % [kworker/u16:1]

This is after roughly 6-7 seconds, and 65 MB has already been written
by that kworker thread.

As I said, this was already happening before an upgrade. I ran the
upgrade anyway, which upgraded linux to 3.16-2, and still got the same
thing. Yes, I'm using [testing].

Any ideas on how to proceed? Next thing I'm going to try is
downgrading linux to 3.15, but I thought I'd post this here first in
case I don't make it back.


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