On Mon, May 11, 2015 at 1:28 PM, Tejun Heo [off-list ref] wrote:

CommWake isn't the problem here.  SError is being dumped just for
information.  The disk is reporting failure on a write command which
is diagnosed as "device error" and thus the link is not reset.  It's
really the device actively reporting command failure.

Ok, that makes sense. Is there any practical way for us to identify
why the device might be doing that? It seems to be limited to the LPM
case, but this is (theoretically) in the same configuration that the
firmware programmed, so it's a little surprising.

-- 
Matthew Garrett | matthew.garrett@coreos.com