[lxc-devel] odd freezer cgroup behavior
Tycho Andersen
tycho.andersen at canonical.com
Thu Oct 29 06:44:44 UTC 2015
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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