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

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Message-ID: <20110704165137.1332c44f@maggie>
Date:	Mon, 4 Jul 2011 16:51:37 +0200
From:	Michael Büsch <m@...s.ch>
To:	Eric Dumazet <eric.dumazet@...il.com>
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

On Mon, 04 Jul 2011 16:45:05 +0200
Eric Dumazet <eric.dumazet@...il.com> wrote:

> Le lundi 04 juillet 2011 à 16:31 +0200, Michael Büsch a écrit :
> > On Mon, 04 Jul 2011 16:00:49 +0200
> > Eric Dumazet <eric.dumazet@...il.com> wrote:
> > > > And an other question. Why so we have the logic to work-around the 1Gb
> > > > DMA limit instead of just setting the dma mask?
> > > 
> > > Your problem is in RX side : NIC actually writes to a buffer that is
> > > supposedly not its property.
> > 
> > The problem is on both sides, because some Linux architectures simply
> > do not support any DMA mask less than 32. This applied to i386 (IA32) last
> > time I looked.
> > The b44 DMA engine can only address 30-bits.
> 
> 
> Michael, traces provided by Alexey are in the RX path.
> 
> NIC does a DMA  (Receives an UDP frame) into a 2048 bytes buffers that
> was freed.

Yeah sure. That's obvious from the logs.
By "the problem" I meant "the 30bit limitation".
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