[lxc-users] lxd git master - lxc stop hangs for 15.04 guest in 14.04 host

[Tycho Andersen]

Hi Sean,

On Wed, May 20, 2015 at 03:14:43PM -0400, Sean McNamara wrote:
> I am using an Ubuntu 14.04 host (upstart init) running linux-generic amd64
> kernel, with lxd-spawned unprivileged lxc container running 15.04 (systemd
> init). Latest 15.04 image with no custom software inside the container, and
> nothing installed but the barebones.
> 
> I applied a profile specifying a custom bridge device and static IP; this
> config works fine for multiple 14.04 containers. Each of these 14.04
> containers can be successfully started and stopped at will.
> 
> But when I create a 15.04 amd64 guest, it will start successfully and is
> usable, but it won't *stop*. Even trying to kill the container processes
> from the host doesn't seem to get rid of it. The container just keeps
> running unless I reboot the system. `lxc stop name` just hangs forever.
> There are only systemd processes and /bin/bash running in the container.
> 
> Should the lxc command have a '-f' flag to send SIGKILL to all the child
> processes of a container in case one of them is hung?

You can do lxc stop $container --force, which does effectively this.

> There is nothing useful in the lxc or lxd logs. All it says is that the
> container changed to RUNNING state. Nothing about it changing to any
> stop/stopping state.
> 
> P.S. - I looked in dmesg, and none of the "stuck" processes have generated
> any kernel oops/warn/etc.

I've seen this in some cases too, but not been able to reproduce it. I
thing stgraber looked at it a while ago, cc-ing him here to see what
he knows.

Tycho

> Thanks,
> 
> Sean

> _______________________________________________
> lxc-users mailing list
> lxc-users at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-users