Re: Ugly rmap NULL ptr deref oopsie on hibernate (was Linux2.6.34-rc3)

From: Minchan Kim
Date: Tue Apr 06 2010 - 12:54:50 EST

On Tue, 2010-04-06 at 09:32 -0700, Linus Torvalds wrote:
> On Wed, 7 Apr 2010, Minchan Kim wrote:
> > >
> > > I don't think so. That isn't the racy case. We're working with a
> > > anon_vma_chain, so the anonvma is all there.
> >
> > But the anon_vma is using for another anon_vma.
> No, that can only happen if somebody has done "anon_vma_free()" on it. And
> nobody does that if the anonvma still has a non-empty'&anon_vma->head'.
> So as long as the anon_vma has a anon_vma_chain entry associated with it
> (or a ksm refcount, but that's a separate issue), it's not going to be
> re-allocated for any other use, because it's not going to be free'd.

> Linus

That's what I am missing.
Thanks, Linus.

I will think over the problem. :)

Kind regards,
Minchan Kim

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