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

From: Borislav Petkov
Date: Wed Apr 07 2010 - 10:14:38 EST

From: Paulo Marques <pmarques@xxxxxxxxxxxx>
Date: Wed, Apr 07, 2010 at 03:05:50PM +0100

> Linus Torvalds wrote:
> > [...]
> > So it once more is 'anon_vma->' that is crap, but now it's not
> > NULL, it's that very odd 0x002e2e2e002e2e2e pattern (the %r13 has had 0x20
> > subtracted from it, so that LSB of "0x0e" is actually _also_ a 0x2e).
> >
> > What does '0x2e' mean? It's ASCII '.', but that doesn't really mean
> > anything either.
> Just a wild shot in the dark: it can be a couple of gray pixels with
> intensity 0x2e at some 32 bits per pixel mode. I say this because of the
> zero bytes there and someone mentioning seeing the problem when starting X.

I don't think those are related: the problem when X was starting happens
with Rik' newest patch and the funny %r13 value happened after enabling
SLUB debugging last night.



Advanced Micro Devices, Inc.
Operating Systems Research Center
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