Re: [Bug 209423] WARN_ON_ONCE() at rtl8169_tso_csum_v2()

[Eric Dumazet]

On 10/8/20 8:50 PM, Eric Dumazet wrote:
>
> 
> OK, it would be nice to know what is the input interface
> 
> if4 -> look at "ip link | grep 4:"
> 
> Then identifying the driver that built such a strange packet (32000
> bytes allocated in skb->head)
> 
> ethtool -i ifname
>

According to https://bugzilla.kernel.org/show_bug.cgi?id=209423

iif4 is the tun200 interface used by openvpn.

So this might be a tun bug, or lack of proper SKB_GSO_DODGY validation
in our stack for buggy/malicious packets.