[Lxc-users] 6mn to launch a VM (lxc hung_task_timeout_secs)

[Daniel Lezcano]

On 08/20/2010 09:16 AM, Sebastien Douche wrote:
> On Thu, Aug 19, 2010 at 23:23, Daniel Lezcano<daniel.lezcano at free.fr>  wrote:
>
>    
>> Hmm, it is very probable the problem is located in the kernel. This kind of
>> warnings appears when a task is in a uninterruptible state and the kernel
>> compilation option CONFIG_DETECT_HUNG_TASK is set.
>>
>> What is the kernel version ?
>>      
> # uname -a
> Linux srv3 2.6.32-trunk-amd64 #1 SMP Sun Jan 10 22:40:40 UTC 2010
> x86_64 GNU/Linux
>
> It's a Debian Squeeze (up to date). After some tests, it seems related
> with some device nodes creation (/dev/pts, /dev/shm...) but i'm not
> sure.
>    

I think you hit a kernel bug. May be this one : 
https://bugzilla.kernel.org/show_bug.cgi?id=14430
Normally, a system container spawns instantaneously.

When the containers starts it does pivot_root and unmount all previous 
mount points belonging to the old rootfs.
Is it possible you have a particular mount on your system which triggers 
this problem ?

Thanks
   -- Daniel