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[libvirt] A bug that libvirt lxc can't destroy all container process.



Hello all,

This is my first mail to this list, so let me introduce myself. My name is yuanzhi cao, and I work in the oVirt team. Currently We are using libvirt lxc in large-scale and found that libvirt can't destroy container process normally .

Environments:

System: zesty
libvirt version: 2.5.0-3ubuntu5
vm rootfs release: ubuntu:16.04

Reproduce:
1. Run command "virsh -c lxc:// start vm" and the release of vm is xenial
2. Run command "pa aux|grep init" ,you would find the pid of init launch by vm.
3. Run command "virsh -c lxc:// destroy vm".
4. Run command "virsh -c lxc:// list --all" and "ps aux|grep init" ,you could find that vm is shutoff, but the init process launch by vm is still running.

Infact I have found the case of this bug, there is a patch after 1.3.1 that import this bug.

-------------------------------------------------------------
Commit: dc576025c360a1d2c89da410d0f3f0da55d0143f [dc57602]
Parents: 511e7c5bba
Author: Daniel P. Berrange <berrange@redhat.com>
Date: 2016年1月23日 GMT+8 上午12:07:18
Commit Date: 2016年1月27日 GMT+8 上午12:11:32
lxc: don't try to hide parent cgroups inside container
-------------------------------------------------------------

Cgroups inside container does't hide parent, so the process of container can change it own cgroup to another cgroup.
lxc destroy process by read cgroup tasks file,if process change it own cgroup,it can't destroy container process normally.


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