[lxc-devel] odd freezer cgroup behavior

[Tycho Andersen]

On Wed, Oct 28, 2015 at 11:55:32AM +0100, Christian Brauner wrote:
> On Wed, Oct 28, 2015 at 04:08:09PM +0900, Tycho Andersen wrote:
> > Hi all,
> > 
> > I'm seeing some (what seems to me to be) odd behavior, where only a
> > task's init process is in its freezer cgroup:
> > 
> > firedrill:~ sudo lxc-info -n proposed
> > Name:           proposed
> > State:          RUNNING
> > PID:            10959
> > IP:             10.0.3.176
> > IP:             10.0.4.1
> > CPU use:        2.77 seconds
> > BlkIO use:      0 bytes
> > Memory use:     24.42 MiB
> > KMem use:       0 bytes
> > Link:           vethM6Q3GG
> >  TX bytes:      1.01 KiB
> >  RX bytes:      3.66 KiB
> >  Total bytes:   4.67 KiB
> > firedrill:~ cat /sys/fs/cgroup/freezer/lxc/proposed/tasks 
> > 10959
> > 
> > I vaguely recall something like this before, but I don't remember how it was
> > resolved. Surely all of the tasks in the container should live in the freezer
> > cgroup?
> > 
> > Note that this doesn't seem to happen with LXD (even with privileged
> > containers). Haven't had time to investigate further.
> 
> Could this be by any chance related to a kernel bug? I don't see this behaviour
> at all (neither priv nor unpriv):

I suppose so; I'm on,

Linux firedrill 4.2.0-10-generic #12-Ubuntu SMP Tue Sep 15 19:43:01 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

(i.e. ubuntu wily with the latest kernel + lxc). It seems odd to me
that the children aren't here, but perhaps I'm misunderstanding how
freezer is supposed to work.

Tycho

>         Archlinux
>         Kernel 4.2.5
>         lxc 1.1.4
>         lxcfs 0.11
>         cgmanager 0.39



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