netdev - Re: network packet corruption in v3.6.0-rc1 (and also in v3.5)

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Message-ID: <CA+Y=x3nFziC+=RhEz7aQofSy15gX=nKqFfQ2DEF0FwXTGmv7zQ@mail.gmail.com>
Date:	Mon, 20 Aug 2012 06:20:52 +1000
From:	Andrew Worsley <amworsley@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>, netdev@...r.kernel.org
Subject: Re: network packet corruption in v3.6.0-rc1 (and also in v3.5)

> OK, this seems to be related to r8712u, still in staging tree.
>
> At first glance, its using a buggy skb_clone(), or kind of a 'reuse skb'
> trick I have no time to investigate.
>
> I suspect that some memory area are overwritten by this driver, and this
> was not noticed with older kernels. With new kernels, its triggering a
> WARN_ON() in tcp stack.
>
> Any chance you can try to reproduce the bug with another adapter ?

Unfortunately I don't have another USB dongle. I could try to get the built in

Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02)
Subsystem: Apple Inc. Device 00ef

but I need to dig out the proprietary firmware - which will take some
time as I am not familiar with the procedure.

The weird thing about this USB dongle is that I brought it because it
was claimed to be supported under Linux

idVendor           0x0b05 ASUSTek Computer, Inc.
idProduct          0x1786 USB-N10 802.11n Network Adapter [Realtek RTL8188SU]

RealTek driver web site -  -
http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=48&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true#RTL8188SU

which claims support "Linux Kernel 2.6.18~2.6.38 and Kernel 3.0.2"
but requires I try compiling the driver from source

Andrew
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