From: "Jeff Kirsher" <jeffrey.t.kirsher@intel.com>
Date: Fri, 1 Aug 2008 16:40:04 -0700

quoted text
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
> IP: [<ffffffff8047b8f3>] __skb_dequeue+0x2d/0x35
> PGD 0
> Oops: 0002 [1] SMP
> CPU 2
> Modules linked in: igb nfsd lockd exportfs sunrpc pci_slot inet_lro
> [last unloaded: igb]
> Pid: 13, comm: events/2 Not tainted 2.6.27-rc1-igb #1
> RIP: 0010:[<ffffffff8047b8f3>]  [<ffffffff8047b8f3>] __skb_dequeue+0x2d/0x35
 ...
quoted text
>  [<ffffffff8047bad4>] ? pfifo_fast_reset+0x1f/0x4c

Looks like two threads are accessing the qdisc SKB lists but one of
them isn't taking the proper qdisc locks.

I can't see how this can happen currently but I'll try to figure it
out.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html