Re: [Bug] OOPS with nf_conntrack_ipv6, probably fragmented UDPv6

[Patrick McHardy <kaber@trash.net>]

Bernhard Schmidt wrote:
> Patrick McHardy wrote:
> 
>>> I've hit another kernel oops with 2.6.20-rc3 on i386 platform. It is
>>> reproducible, as soon as I load nf_conntrack_ipv6 and try to send
>>> something large (scp or so) inside an OpenVPN tunnel on my client
>>> (patched with UDPv6 transport) the router (another box) OOPSes.
>>>
>>> tcpdump suggests the problem appears as soon as my client sends
>>> fragmented UDPv6 packets towards the destination. It does not happen
>>> when nf_conntrack_ipv6 is not loaded. This is the OOPS as dumped from
>>> the serial console:
>>
>> Does this patch help?
> 
> 
> Yes, seems to be working fine.

Thanks, I'll send it upstream tonight.

> Can you tell since when this bug is in the kernel?

The real bug is in nf_conntrack and probably has been there since
the beginning (which I think is about 1.5 years ago). It blows up
in combination with the GSO code, which I believe was added in
2.6.18-rc, but it might have caused troubles somewhere else before.

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