netdev - 答复: 答复: [PATCH] set fake_rtable's dst to NULL to avoid kernel Oops.

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Date:	Thu, 29 Mar 2012 17:38:59 +0800
From:	"Peter Huang (Peng)" <peter.huangpeng@...wei.com>
To:	'Eric Dumazet' <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, harry.majun@...wei.com,
	zhoukang7@...wei.com, 'netdev' <netdev@...r.kernel.org>
Subject: 答复: 答复: [PATCH] set fake_rtable's dst to NULL to avoid kernel Oops.

Thks for your mail.

>Check net/bridge/br_netfilter.c and commits e688a6048076 (net: introduce
>DST_NOPEER dst flag )  4adf0af6818f3ea5 (bridge: send correct MTU value
>in PMTU (revised))

This patch already included in kernel-3.3, but for our case, virtual tap device's delayed
Deletion will also cause kernel oops even in kernel3.3.

>Apparently bug is because struct net_bridge is freed while its embedded
>fake_rtable is still used by some packets.

>I am not sure we are allowed to NULLify skb->dst, it might break
>netfilter.

Are you familiar with fake_rtable? I search the source, but only find one op that operate on the MTU.

>Maybe real fix would be to use a non embedded dst.

I agreed with you to, so at least until now this problem still exsits in the latest kernel, I will also look into it,
And try to modify it from the root.

Thanks again.

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