From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in
 ipv6_select_ident
Date: Thu, 22 Dec 2011 13:29:50 -0500 (EST)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 22 Dec 2011 18:41:32 +0100

> IPv6 needs multicast capabilities, so maybe balance-rr bonding mode is
> not propagating multicat filters properly on both nics.
> 
> It might be a problem on one of your NIC.

This is my impression too, definitely some kind of multicast problem.