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: <d8808206-0951-4512-91cb-58839ba9b8c4@nop.hu>
Date: Mon, 20 Oct 2025 23:31:37 +0200
From: mc36 <csmate@....hu>
To: Jason Xing <kerneljasonxing@...il.com>, alekcejk@...glemail.com
Cc: 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

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

> ////// sudo ./a.out
> 
that will do the trick on a recent kerlek....

its the destination mac in the c code....

ps: chaining in the original reporter from the fedora land.....


have a nice day,

cs