Ernst Herzberg wrote:
> This machine oopses one to three (or more?) times a day. Occurs since upgrading 
> from -rc3 to -rc4 (and adding/reconfiguring raid).
> 
> It is reproducable, i have only to wait 10min to a couple of hours:-)
> 
> Opps copy/pasted from a serial console, long lines maybe truncated.
> dmesg is from the _previous_ boot/oops....
> 
> -------------------------------------------
> Oops: 0000 [#1]
> PREEMPT
> Modules linked in: ebt_log ebt_ip ebtable_filter ebtables nfsd exportfs lockd sunrpc w83627hf hwmon_vid i2c_isa xt_tcpudp xt_state ipt_MASQUERADE iptable_e
> CPU:    0
> EIP:    0060:[<b033fbf3>]    Not tainted VLI
> EFLAGS: 00010282   (2.6.16-rc4 #3)
> EIP is at xfrm_lookup+0x1f/0x47d
> eax: 00000000   ebx: b0452bb4   ecx: 00000000   edx: b0452bb4
> esi: b0452c90   edi: d6c9aa58   ebp: 80000000   esp: b0452b08
> ds: 007b   es: 007b   ss: 0068
> Process vtund (pid: 12035, threadinfo=b0452000 task=ef8cb030)
> Stack: <0>b0452000 d6c9aa58 b0452bc4 00000000 f153b56a b0452b84 d6c9aa58 f1546181
>        b03e5d20 00000000 b0452bb4 b0452bb0 b0452b84 b0452b94 f1546511 d804fd24
>        d6c9aa58 b0452b94 d6c9aa58 00000000 b0452b84 f15465a6 d6c9aa58 00000000
> Call Trace:
>  [<f153b56a>] ip_conntrack_tuple_taken+0x2c/0x3e [ip_conntrack]
>  [<f1546181>] ip_nat_used_tuple+0x1f/0x2b [ip_nat]
>  [<f1546511>] get_unique_tuple+0xca/0xe6 [ip_nat]
>  [<f15465a6>] ip_nat_setup_info+0x79/0x1fd [ip_nat]
>  [<b033ac28>] ip_xfrm_me_harder+0x5d/0x14b
>  [<f154b882>] ip_nat_out+0xb2/0xde [iptable_nat]
>  [<b034d154>] br_dev_queue_push_xmit+0x0/0x12a

This patch should fix it. Please test it and report if it helps.