netdev - Re: [Bug 209423] WARN_ON_ONCE() at rtl8169_tso_csum

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Date:   Thu, 8 Oct 2020 21:07:02 +0200
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [Bug 209423] WARN_ON_ONCE() at rtl8169_tso_csum_v2()



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.