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[Bug 1709224] Re: libvirt lxc can't stop all process when destroy vm.

 

Hi yuanzhicao,
thank you for your report and your analysis to a suggested fix.

The fix you refer to was released in 1.3.2, setting later releases to
fix-released.

In general Libvirt's lxc support is not of focus, I'd highly recommend
using lxd for system containers which is far more stable in my
experience (Setting prio low to reflect that).

I'll try to quickly come up with a ppa to test for you and get back
here.

** Also affects: libvirt (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: libvirt (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1709224

Title:
  libvirt lxc  can't stop all process when destroy vm.

Status in libvirt package in Ubuntu:
  Fix Released
Status in libvirt source package in Xenial:
  New

Bug description:
  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@xxxxxxxxxx>
  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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