netdev - Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison overwritten

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Message-ID: <1309791232.2247.27.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Mon, 04 Jul 2011 16:53:52 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Michael Büsch <m@...s.ch>
Cc:	Alexey Zaytsev <alexey.zaytsev@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, Gary Zambrano <zambrano@...adcom.com>,
	bugme-daemon@...zilla.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Pekka Pietikainen <pp@...oulu.fi>,
	Florian Schirmer <jolt@...box.org>,
	Felix Fietkau <nbd@...nwrt.org>, Michael Buesch <mb@...sch.de>
Subject: Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison
 overwritten

Le lundi 04 juillet 2011 à 16:43 +0200, Michael Büsch a écrit :
> On Mon, 4 Jul 2011 16:27:26 +0200
> Michael Büsch <m@...s.ch> wrote:
> > We do this in b43, which has exactly the same DMA engine.
> 
> (Ok, it turns out we don't do this in b43 (We only do it on the TX side).
>  But that's a bug. We should do a wmb() on the RX side before advancing the
>  descriptor ring pointer.)


Also it appears rx_ring (or tx_ring ) are not necessarily 4K aligned if
kzalloc() path is taken.

(SL?B DEBUG -> kzalloc(4096) might not be 4K aligned)


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