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[2003:ea:8f00:6a00:28bc:8b04:587d:85d4]) by smtp.googlemail.com with ESMTPSA id bu23sm4792682edb.69.2020.10.08.13.54.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 Oct 2020 13:54:21 -0700 (PDT) Subject: Re: [Bug 209423] WARN_ON_ONCE() at rtl8169_tso_csum_v2() To: Eric Dumazet , Eric Dumazet Cc: "netdev@vger.kernel.org" References: <80adc922-f667-a1ab-35a6-02bf1acfd5a1@gmail.com> <733a6e54-f03c-0076-1bdc-9b0d4ec1038c@gmail.com> <9e4b2b1f-c2d9-dbd0-c7ce-49007ddd7af2@gmail.com> <77541223-8eaf-512c-1930-558e8d23eb33@gmail.com> From: Heiner Kallweit Message-ID: <186242a7-4e63-dccc-0879-1069823f079a@gmail.com> Date: Thu, 8 Oct 2020 22:54:17 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 08.10.2020 21:07, Eric Dumazet wrote: > > > 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. > > Following old commit sounds like it might be related: 622e0ca1cd4d ("gro: Fix bogus gso_size on the first fraglist entry") This code however was removed later in 58025e46ea2d ("net: gro: remove obsolete code from skb_gro_receive()")