linux-kernel - kernel panic when running tcpdump

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Message-Id: <200710222040.19921.m.kozlowski@tuxland.pl>
Date:	Mon, 22 Oct 2007 20:40:18 +0200
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Garzik <jeff@...zik.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-ppp@...r.kernel.org
Subject: kernel panic when running tcpdump

Hello,

	I'm seeing reproducible oops on 2.6.23-mm1 when trying to run tcpdump
over ppp0 interface. To reproduce I type simply:

# tcpdump -i ppp0

and wait a few seconds. I captured two oopses with a bit different stack
trace but EIP always points to packet_rcv():

(gdb) l* 0xc02d7d49
0xc02d7d49 is in packet_rcv (include/linux/netdevice.h:830).
825     static inline int dev_parse_header(const struct sk_buff *skb,
826                                        unsigned char *haddr)
827     {
828             const struct net_device *dev = skb->dev;
829     
830             if (!dev->header_ops->parse)
831                     return 0;
832             return dev->header_ops->parse(skb, haddr);
833     }
834

Please find pics attached (sorry for poor quality - I can provide you with better ones
tommorow if needed):

http://tuxland.pl/misc/2.6.23-mm1/DSC00136.JPG
http://tuxland.pl/misc/2.6.23-mm1/DSC00142.JPG

Regards,

	Mariusz

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