I recently upgraded to 2.6-test11 due to a problem I was having on test9. I would notice on large (70MB or greater) file transfers via the network (to or from my box) would freeze up the network. My messages file would complain about the following:

Nov 20 09:15:25 senor kernel: ip_local_deliver: bad loopback skb: PRE_ROUTING LOCAL_IN
Nov 20 09:15:25 senor kernel: skb: pf=2 (unowned) dev=lo len=328
Nov 20 09:15:25 senor kernel: PROTO=17 0.0.0.0:68 255.255.255.255:67 L=328 S=0x10 I=0 F=0x0000 T=64

This issue would happen even if I 'cleared' my firewall rules and ran completely open. Like I said this only started happening with test9 kernel and perhaps someone else has seen this? I would usually fix it by unplumbing and re-plumbing my eth0 inteface. I hope that it doesn't happen again with this new kernel. ;-)

Thanks!!