* Christoph Mathys | 2015-12-23 14:55:08 [+0100]:

While running my "infamous" tests with containers[0] on 4.1, I get
system freezes regularly. I have tried with and without PREEMPT_RT.
The lockups did only occur on RT and when the cgroup "memory" was in
use. Without rt or this particular cgroup (cgroup_disable kernel
parameter), my test ran for ~15h before I stopped it manually.

tldr; CONFIG_MEMCG seem to be broken for PREEMPT_RT.

I don't know if the errors below are directly responsible for the
system freeze, but they are the last thing I see from the system
before it freezes.

The second dump below might contain some typos because I had to
convert it manually from a screenshot to text.

The memcg tests from LTP didn't cause any problems. And after about
three hours trying to get lxc to work I gave up.
So I have no idea how to continue here.

[0] http://www.spinics.net/lists/linux-rt-users/msg14262.html

Sebastian