Bug#851119: memcg causing freezes on backports kernel

[Laurence Parry <greenreaper@hotmail.com>]

memory cgroups decreased the stability of 4.8, regardless of whether they 
were actively being used; we were not actively using them, but still 
experienced lockups. Disabling them on the kernel command line fixed it.

I'm not sure if it's been fixed in 4.9 because I removed memcgroups them 
from our kernel compilation entirely. It'd certainly be worth trying 4.9.18 
if you haven't already, as I know they were working on the problem.
-- 
Laurence "GreenReaper" Parry - Inkbunny administrator
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