Date: Tue, 28 Feb 2012 18:40:50 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: Siddhesh Poyarekar <siddhesh.poyarekar@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Jamie Lokier <jamie@shareable.org>, Mike Frysinger <vapier@gentoo.org>,
        Alexey Dobriyan <adobriyan@gmail.com>, Matt Mackall <mpm@selenic.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org
Subject: Re: + procfs-mark-thread-stack-correctly-in-proc-pid-maps.patch
	added to -mm tree
Message-ID: <20120228174049.GA11136@redhat.com>
References: <20120228170436.GA9698@redhat.com> <CAAHN_R1hmJt4zCxGAL7z2-9URmWUFwwV9pcqkdvQZodpunEJjQ@mail.gmail.com>
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On 02/28, Siddhesh Poyarekar wrote:
>
> On Tue, Feb 28, 2012 at 10:34 PM, Oleg Nesterov <oleg@redhat.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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