netdev - Re: null pointer dereference in interrupt after receiving an ip packet on veth from xsk from user space

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Message-ID: <CAL+tcoA0TKWQY4oP4jJ5BHmEnA+HzHRrgsnQL9vRpnaqb+_8Ag@mail.gmail.com>
Date: Tue, 21 Oct 2025 19:02:06 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: mc36 <csmate@....hu>
Cc: alekcejk@...glemail.com, Jonathan Lemon <jonathan.lemon@...il.com>, 
	Stanislav Fomichev <sdf@...ichev.me>, Maciej Fijalkowski <maciej.fijalkowski@...el.com>, 
	Magnus Karlsson <magnus.karlsson@...el.com>, Björn Töpel <bjorn@...nel.org>, 
	1118437@...s.debian.org, netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: null pointer dereference in interrupt after receiving an ip
 packet on veth from xsk from user space

On Tue, Oct 21, 2025 at 5:31 AM mc36 <csmate@....hu> wrote:
>
> hi,
>
> On 10/20/25 11:04, Jason Xing wrote:
> >
> > I followed your steps you attached in your code:
> > ////// gcc xskInt.c -lxdp
> > ////// sudo ip link add veth1 type veth
> > ////// sudo ip link set veth0 up
> > ////// sudo ip link set veth1 up
>
> ip link set dev veth1 address 3a:10:5c:53:b3:5c

Great, it indeed helps me reproduce the issue, so I managed to see the
exact same stack. Let me dig into it more deeply.

Thanks,
Jason