[Lxc-users] [PATCH 2/2] cgroups: support cgroups mounted in multiple places

[Daniel Lezcano]

On 06/26/2011 05:52 PM, Michael H. Warfield wrote:
> On Sun, 2011-06-26 at 17:27 +0200, Daniel Lezcano wrote: 
>> On 06/26/2011 05:06 PM, Serge E. Hallyn wrote:
>>> Quoting Michael H. Warfield (mhw at WittsEnd.com):
>>>>> cd /sys/fs/cgroup
>>>>>    for d in `/bin/ls`; do
>>>>>       echo 1 > $d/cgroup.clone_children
>>>>>    done
>>>>
>>>> Doing this step alone broke lxc totally for me, with or without the
>>>> patch below.  This was on Fedora 15 testing with lxc 0.7.4.2 as well as
>>>
>>> Do you have the ns cgroup mounted?  The above is only for without
>>> ns cgroup.
> 
>> Yes, the ns_cgroup and clone_children are mutually exclusive.
> 
>> If you try to create a namespace with a ns cgroup mounted and the
>> clone_children flag is set. The 'clone' will return EINVAL.
> 
>> I noticed with the patch applied because there was a bug in it which was
>> setting this flag even if the cgroup was ns.
> 
>> It is possible, you ran lxc with the patch, the clone_children was set,
>> and then you remove the patch and try to run lxc again. As the
>> clone_children is still set, that will make impossible to clone a new
>> namespace.
> 
>> With the patch I sent previously on top of Serge's patch, that should be
>> fixed.
> 
> Ok...  Got that an threw it into the mix.
> 
> I'm still seeing the segfaults on lxc-info.  Seems to fault even if I
> specify the name of a non-existent machine as well.

Oh, seems I missed this info :s

If you launch lxc-info -n foo, that segfaults ?

On what architecture does it fault ?