Re: v4.14-rc3/arm64 DABT exception in atomic_inc() / __skb_clone()

[Jason Wang]

On 2017å10æ26æ 03:01, Eric Dumazet wrote:
> On Wed, Oct 25, 2017 at 11:49 AM, Willem de Bruijn
> <willemdebruijn.kernel@xxxxxxxxx> 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")

Thanks, will post a patch.