linux-kernel - [PATCH v2 -mm 0/1] pidns: find_new_reaper() can no longer switch to init_pid_ns.child

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Date:	Sun, 27 May 2012 21:10:32 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Louis Rilling <louis.rilling@...labs.com>,
	Mike Galbraith <efault@....de>
Subject: [PATCH v2 -mm 0/1] pidns: find_new_reaper() can no longer switch
	to init_pid_ns.child_reaper

On 05/25, Eric W. Biederman wrote:
>
> Oleg Nesterov <oleg@...hat.com> writes:
>
> > Change find_new_reaper() to use pid_ns->parent->child_reaper.
>
> Oleg this is a good catch for a real problem.  However I disagree about
> the fix.
>
> We should make unhash_process say:
> 	if ((task_active_pid_ns(parent)->child_reaper == parent) &&

Damn, I hate you^W^W^W thanks a lot Eric.

Indeed! Not only this is more simple, this is just more natural!

> And we should just set delete the code after zap_pid_ns_processes

Yes, this is clear.

> We could set pid_ns.child_reaper to NULL after that
> but why bother.

Agreed. Plus I do not think that pid_ns.child_reaper == NULL looks
good even if this doesn't matter currently.

OK, please see v2. Note that I moved detach_pid(PIDTYPE_PID) back.
Yes, yes, there is no real reason to do this. Just I think that if
someone look at these changes later, it is not easy to understand
why it was moved down.

Thanks!

Oleg.

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