[Devel] Re: [PATCH 1/15] Move exit_task_namespaces()

[Oleg Nesterov]

On 08/06, Pavel Emelyanov wrote:
>
> If task X is exiting and has already exit_task_namespaces()-ed task
> Y will OOPs during its exit in determining parent's namespace. I agree 
> that in that case this is not important what namespace X belongs to, 
> but we need to handle the race with changing the nsproxy from not-NULL
> to NULL. This is OK to make this under task_lock() but what to add 
> extra locking for if we can avoid it?

No, we can't take task_lock() under write_lock(tasklist).

Oleg.