netdev - Re: [Bugme-new] [Bug 33502] New: Caught 64-bit read from uninitialized memory in __alloc

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Message-ID: <alpine.DEB.2.00.1104191617070.23077@router.home>
Date:	Tue, 19 Apr 2011 16:18:43 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, casteyde.christian@...e.fr,
	Vegard Nossum <vegardno@....uio.no>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [Bugme-new] [Bug 33502] New: Caught 64-bit read from uninitialized
 memory in __alloc_skb

On Tue, 19 Apr 2011, Eric Dumazet wrote:

> > Ugg.. Isnt there some way to indicate to kmemcheck that a speculative
> > access is occurring?
>
> Yes, here is a totally untested patch (only compiled here), to keep
> kmemcheck & cmpxchg_double together.

Ok looks somewhat saner. Why does DEBUG_PAGEALLOC need this? Pages are
never freed as long as a page is frozen and a page needs to be frozen to
be allocated from. I dont see how we could reference a free page.
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