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

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Date:	Tue, 5 Jul 2011 02:29:13 +0400
From:	Alexey Zaytsev <alexey.zaytsev@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Michael Büsch <m@...s.ch>,
	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 Tue, Jul 5, 2011 at 00:25, Alexey Zaytsev <alexey.zaytsev@...il.com> wrote:
> On Mon, Jul 4, 2011 at 19:12, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> 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.)
>>
>> I am wondering what happens if RX ring is set to 64, and we receive
>> exactly 64 buffers in one round, B44_DMARX_PTR wont change at all ?
>>
>> Alexey, could you try this patch please ?
>
> Sorry, did not help.
>

Ran a few rounds of tcpdump. Seeing a significant number or duplicate
ACKs from the problematic machine. Not seeing them when testing
between this machine and an other linux box. Or the illumos machine
and the other linux box.

Dumps are available here:

http://zaytsev.su/tmp/caps/

dump1-3 - between the problematic machine an the illumos box,
collected on illumos side. All show dups.
dump5 - between an other linux box and the illumos machine, no dups.
Collcted on the illumos side.
dump-linux - between 2 linux machines, collected on the
non-problematic side. No dups, no corruptions.

192.168.0.33 - the problematic machine.
192.168.0.72 - the illumos machine.
192.168.0.122 - an other linux machine.
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