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In-Reply-To: <062061fc4d4d3476e3b0255803b726956686eb19.camel@redhat.com>
From:   Ian Kumlien <ian.kumlien@gmail.com>
Date:   Tue, 4 Jul 2023 16:06:58 +0200
Message-ID: <CAA85sZv9KCmw8mAzK4T-ORXB48wuLF+YXTYSWxkBhv3k_-wzcA@mail.gmail.com>
Subject: Re: [Intel-wired-lan] bug with rx-udp-gro-forwarding offloading?
To:     Paolo Abeni <pabeni@redhat.com>
Cc:     Alexander Lobakin <aleksander.lobakin@intel.com>,
        intel-wired-lan <intel-wired-lan@lists.osuosl.org>,
        Jakub Kicinski <kuba@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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Precedence: bulk

On Tue, Jul 4, 2023 at 3:41=E2=80=AFPM Paolo Abeni <pabeni@redhat.com> wrot=
e:
>
> On Tue, 2023-07-04 at 15:23 +0200, Ian Kumlien wrote:
> > On Tue, Jul 4, 2023 at 2:54=E2=80=AFPM Paolo Abeni <pabeni@redhat.com> =
wrote:
> > >
> > > On Tue, 2023-07-04 at 13:36 +0200, Ian Kumlien wrote:
> > > > Propper bug this time:
> > > > cat bug.txt | ./scripts/decode_stacktrace.sh vmlinux
> > >
> > > To be sure, is this with the last patch I shared? this one I mean:
> >
> > The current modifications I have, on top of v6.4.1, is:
> > diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> > index cea28d30abb5..8552caa197f9 100644
> > --- a/net/core/skbuff.c
> > +++ b/net/core/skbuff.c
> > @@ -4272,6 +4272,11 @@ struct sk_buff *skb_segment_list(struct sk_buff =
*skb,
> >
> >         skb_shinfo(skb)->frag_list =3D NULL;
> >
> > +       /* later code will clear the gso area in the shared info */
> > +       err =3D skb_header_unclone(skb, GFP_ATOMIC);
> > +       if (err)
> > +               goto err_linearize;
> > +
> >         while (list_skb) {
> >                 nskb =3D list_skb;
> >                 list_skb =3D list_skb->next;
> > @@ -4328,6 +4333,9 @@ struct sk_buff *skb_segment_list(struct sk_buff *=
skb,
> >
> >         skb->prev =3D tail;
> >
> > +       if (WARN_ON_ONCE(!skb->next))
> > +               goto err_linearize;
> > +
> >         if (skb_needs_linearize(skb, features) &&
> >             __skb_linearize(skb))
> >                 goto err_linearize;
> > ---
> >
> > > https://lore.kernel.org/netdev/92a4d42491a2c219192ae86fa04b579ea3676d=
8c.camel@redhat.com/
> > >
> > > Could you please additionally enable CONFIG_DEBUG_NET in your build?
> >
> > Sure, will do
> >
> > > Could you please give a detailed description of your network topology
> > > and the running traffic?
> >
> > This machine has two "real interfaces" and two interfaces that runs as
> > bridges for virtual machines
> > eno1 - real internal
> > eno2 - bridge - internal
> > eno3 - real external
> > eno4 - bridge - external
> >
> > The bridges are used by three virtual machines, two of which are
> > attached on both networks
> >
> > Traffic seemed to be video streaming, at least at first, now I don't
> > really know. I do have a few smart devices so I assume there is
> > a bit of multicast traffic as well - but not really anything unusual as=
 such.
>
> In there any XDP program running on the host side? Possibly changing
> the packet hdr?

Only systemd standard things, I haven't done anything and the normal
nftables fw doesn't do anything special

> Thanks!
>
> /P
>