Subject: Re: pppd service crash in linux-3.13.6

From: Oleg Nesterov <[email-masked]>
Date: Fri, 14 Mar 2014 20:23:46 +0100

On 03/14, Peter Hurley wrote:
>
>> On 03/13/2014 01:06 PM, Oleg Nesterov wrote:
>>>
>>> OTOH, why we should delay disassociate_ctty? IOW, do you see any
>>> potential problem with the trivial patch below?
>
> Won't work.
>
> cgroup_exit() can exec a userspace process (the notify_on_exit() facility)
                                                  ^^^^^^^^^^^^^^^^

can't find anything named notify_on_exit, perhap you meant
cgroup_release_agent? Although I guess this should not matter.

> which requires both namespace and tty facilities.

Hmm... why?

The exiting task obviously can't exec. The only way to spawn a userspace
process is call_usermodehelper(), it should work just fine, no?

Oleg.