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: <7e58078f-8355-4259-b929-c37abbc1f206@suse.de>
Date: Tue, 21 Oct 2025 12:51:32 +0200
From: Fernando Fernandez Mancera <fmancera@...e.de>
To: mc36 <csmate@....hu>, 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



On 10/20/25 11:31 PM, mc36 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
> 
>> ////// 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
> 
> 

hi, FWIW I have reproduced this and I bisected it, issue was introduced 
at 30f241fcf52aaaef7ac16e66530faa11be78a865 - working on a patch.

Thanks,
Fernando.