netdev - Re: 3.7.3+: Bad paging request in ip_rcv_finish while running NFS traffic.

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Date:	Mon, 21 Jan 2013 21:57:43 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>
Subject: Re: 3.7.3+:  Bad paging request in ip_rcv_finish while running NFS
 traffic.

On 01/21/2013 08:40 PM, Eric Dumazet wrote:
> On Mon, 2013-01-21 at 16:32 -0800, Ben Greear wrote:
>> On 01/21/2013 01:07 PM, Ben Greear wrote:
>>> I posted about this a few days ago, but this time the patches applied
>>> are minimal and there are no out-of-tree kernel modules loaded.
>>
>> Here's another crash, this time with SLUB memory debugging turned on.
>>
>> Seems much harder to hit this way...I've only managed this one.  I
>> believe the RCX register might be interesting...that 6b is probably
>> freed memory poisioning.  Maybe skb or skb_dest() is already freed?
>>
>> I have added a 'verify_mem_not_deleted(skb)' before the
>> dst_input line in ip_rcv_finish..but so far, it hasn't
>> hit the problem...
>>
>
> There is no way skb is freed here.
>
> I would say macvlan is at fault here.
>
> It probably lacks a proper (dev->flags & IFF_UP) test.

Thanks for the patch.  It's running OK so far, but I'll need to
do a bunch more testing tomorrow to make sure I'm not just getting
lucky!

I'll let you know how it goes tomorrow.

Thanks,
Ben



-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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