On Mon, May 23, 2016 at 03:03:03PM +0100, Vitor Cunha wrote:
> We've found-out that (under certain conditions) the length field of the
> GTP-U header could have a wrong value (mostly when under load and usually
> with larger packets).
> I believe this is due to a race-condition in gtp_build_header (len may
> change between the push to skb and the actual writing of the len value in
> the header), which we have solved by saving the value of skb->len before
> pushing the header.
> 
> (Git patch is attached, hopefully in the right format -- an overkill for the
> fix itself)
> 
> static void gtp_build_header(struct sk_buff *skb,
>                              const struct ip_tunnel_key *tun_key)

OVS doesn't contain a function named gtp_build_header.
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