linux-kernel - Re: + procfs-mark-thread-stack-correctly-in-proc-pid-maps.patch added to -mm tree

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Date:	Tue, 28 Feb 2012 18:40:50 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Siddhesh Poyarekar <siddhesh.poyarekar@...il.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jamie Lokier <jamie@...reable.org>,
	Mike Frysinger <vapier@...too.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: + procfs-mark-thread-stack-correctly-in-proc-pid-maps.patch
	added to -mm tree

On 02/28, Siddhesh Poyarekar wrote:
>
> On Tue, Feb 28, 2012 at 10:34 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> >> +int vm_is_stack(struct task_struct *task,
> >> +                           struct vm_area_struct *vma, int in_group)
> >> +{
> >> +     if (vm_is_stack_for_task(task, vma))
> >> +             return 1;
> >> +
> >> +     if (in_group) {
> >> +             struct task_struct *t = task;
> >> +             while_each_thread(task, t) {
> >> +                     if (vm_is_stack_for_task(t, vma))
> >> +                             return 1;
> >> +             }
> >> +     }
> >> +
> >> +     return 0;
> >> +}
> >
> > This is obviously wrong, while_each_thread() is not safe without
> > tasklist or siglock or rcu.
>
> I have fixed this in my git stash. I'll submit

OK, please CC me ;)

Oleg.

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