netdev - Re: 2.6.25-rc9: Reported regressions from 2.6.24

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Date:	Sun, 13 Apr 2008 22:18:54 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Pavel Emelyanov <xemul@...nvz.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	andy@...yhouse.net
Subject: Re: 2.6.25-rc9: Reported regressions from 2.6.24

Patrick McHardy wrote:
>>>
>>> Bug-Entry    : http://bugzilla.kernel.org/show_bug.cgi?id=10323
>>> Subject        : panic using bridging on linus kernel 2.6.25-rc6
>>> Submitter    : Andy Gospodarek <andy@...yhouse.net>
>>> Date        : 2008-03-25 11:40 (20 days old)
>>
>> This looks like another network-namespace regression.
>> icmp_send() does:
>>
>>        net = rt->u.dst.dev->nd_net;
>>
>> The bridge netfilter code attaches a fake dst_entry to the
>> skb which has dev == NULL when passing it to IPv4 netfilter.
>>
>> Pavel, do you have a better ideas for fixing this than
>> instantiating a dst_entry in br_netfilter.c for every
>> device (or at least for every namespace)? 
>
> The description of the problem was not entirely correct, the
> bridge-netfilter dst_entry does have a proper device pointer,
> it points to a dummy net_device structure however that doesn't
> have a namespace associated with it. This blows up in
> __ip_route_output_key.

For now I suggest this fix. Andy, could you please test whether it
fixes the problem?



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