linux-kernel - Re: pppd service crash in linux-3.13.6

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Message-ID: <20140314192346.GA14823@redhat.com>
Date:	Fri, 14 Mar 2014 20:23:46 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Sree Harsha Totakura <sreeharsha@...akura.in>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: pppd service crash in linux-3.13.6

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.

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