netdev - Re: [PATCH] net: sk == 0xffffffff fix

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Date:	Mon, 09 Dec 2013 07:31:59 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: sk == 0xffffffff fix - not for commit

On Mon, 2013-12-09 at 12:47 +0100, Andrzej Pietrasiewicz wrote:
> NOT FOR COMMITTING TO MAINLINE.
> 
> With g_ether loaded the sk occasionally becomes 0xffffffff.
> It happens usually after transferring few hundreds of kilobytes to few
> tens of megabytes. If sk is 0xffffffff then dereferencing it causes
> kernel panic.
> 
> This is a *workaround*. I don't know enough net code to understand the core
> of the problem. However, with this patch applied the problems are gone,
> or at least pushed farther away.

Is it happening on SMP or UP ?

Crash should happen earlier in __inet_lookup_established()


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