On Wed, Oct 25, 2017 at 11:49 AM, Willem de Bruijn <willemdebruijn.ker...@gmail.com> wrote:
> From skb->dev and netdev_priv, the tun device has flags 0x1002 == > IFF_TAP | IFF_NO_PI. This kernel precedes the recent support for > IFF_NAPI and IFF_NAPI_FRAGS. The allocation most likely happened > in tun_build_skb from current->task_frag. It would be a previous > allocation that left alloc_frag->offset unaligned. But perhaps this code > needs to perform alignment before setting skb->head. At least on > platforms where atomic on dataref must be aligned. +1 Bug added in commit 66ccbc9c87c2 ("tap: use build_skb() for small packet")