netdev - Re: tcp: kernel BUG at net/core/skbuff.c:3574!

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Date:   Tue, 21 Dec 2021 16:39:57 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        Ignat Korchagin <ignat@...udflare.com>
Cc:     netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        kernel-team <kernel-team@...udflare.com>
Subject: Re: tcp: kernel BUG at net/core/skbuff.c:3574!

On Tue, 2021-12-21 at 06:16 -0800, Eric Dumazet wrote:
> On Tue, Dec 21, 2021 at 4:19 AM Ignat Korchagin <ignat@...udflare.com> wrote:
> > 
> > Hi netdev,
> > 
> > While trying to reproduce a different rare bug we're seeing in
> > production I've triggered below on 5.15.9 kernel and confirmed on the
> > latest netdev master tree:
> > 
> 
> Nothing comes to mind. skb_shift() has not been recently changed.
> 
> Why are you disabling TSO exactly ?
> 
> Is GRO being used on veth needed to trigger the bug ?
> (GRO was added recently to veth, I confess I did not review the patches)

This is very likely my fault. I'm investigating it right now.

Thanks for the head-up.

Paolo