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

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Date:	Wed, 20 Apr 2011 09:45:19 +0200
From:	casteyde.christian@...e.fr
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux.com>,
	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>
Subject: Re: [Bugme-new] [Bug 33502] New: Caught 64-bit read from uninitialized memory in __alloc_skb

Quoting Eric Dumazet <eric.dumazet@...il.com>:


> > Looks good to me! Can we get someone to test it as well?
>
> I tested first patch, but was not able to trigger the fault anyway
> without it. I'll try a bit more today if time permits...
>
> It would be nice if Christian can reproduce the initial problem easily
> and give us the steps...
>
>
>
>

Indeed I can reproduce each time I boot, however I didn't managed to apply the
patch to test it on -rc3 (neither -rc4), only the first hunk passed.

I simply boot on this laptop with kmemcheck activated to get the warning, with
vanilla -rc3. I've also tested -rc4 yersterday (without the patch therefore),
the warning was not the same (it's a bit later, I will post the dmesg output on
bugzilla tonight).

For info, my laptop is single core if that matters, it is preemptible, with
slub, 64bits, on an old CPU (Athlon64 3000 pre- lahf in 64bits).
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