On Wed, 2014-12-17 at 10:55 +0100, Michal Kubecek wrote:
> Would it be possible that the kernel you are using has
> 
>   da08143b8520 ("vlan: more careful checksum features handling")
> 
> (and possibly also a9b3ace44c7d and 3625920b62c3) but not
> 
>   db115037bb57 ("net: fix checksum features handling in netif_skb_features()")

Ubuntu's 3.13.0 has none of these changes.
Ubuntu's 3.16.0 has all four changes.

The problem occurs on both kernels.

-- 
Richard