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

[Stéphane Graber]

On Wed, May 20, 2015 at 03:08:51PM -0700, Tycho Andersen wrote:
> 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.

Last I checked, the problem was that systemd in 15.04 doesn't respond to
SIGPWR the same way upstart did.

Martin (Cced) was looking into fixing that a few weeks ago.

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

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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