Patrick McHardy wrote:
> Patrick McHardy wrote:
>> Nir Tzachar wrote:
>>> Hello.
>>>
>>> The following warning is reproducible with the code below on 2.6.25.6,
>>> which uses sendmsg on a udp socket using two iovecs:
>>>
>>> ....
>>> And I always get  the following warning twice:
>>>
>>> [ 6658.338116] ------------[ cut here ]------------
>>> [ 6658.338121] WARNING: at net/ipv4/netfilter/nf_nat_standalone.c:89
>>> nf_nat_fn+0x33/0x155()
>>
>> Thanks for the report. Does this patch fix it?
> 
> Actually, this can't be it. Let me look again.

Found it - we lost an ifdef during the transition to nf_conntrack
guarding an exception from defragmentation on loopback input.

This patch should fix the warning.