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From: David Miller <davem@davemloft.net>
Subject: Re: [BUG: 3.13.0-rc4] inconsistent lock state
Date: Tue, 17 Dec 2013 14:24:04 -0500 (EST)
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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 17 Dec 2013 11:06:15 -0800

>  this seems to be due to __udp4_lib_rcv() doing udp_sk_rx_dst_set(),
> which takes the 'sk->sk_dst_lock' spinlock. This all happens in a
> software irq context.

I have a fix for this from Eric that I'll send to you today.