Bug#1118437: null pointer dereference in interrupt after receiving an ip packet on veth from xsk from user space
- To: mc36 <csmate@nop.hu>
- Cc: alekcejk@googlemail.com, Jonathan Lemon <jonathan.lemon@gmail.com>, Stanislav Fomichev <sdf@fomichev.me>, Maciej Fijalkowski <maciej.fijalkowski@intel.com>, Magnus Karlsson <magnus.karlsson@intel.com>, Björn Töpel <bjorn@kernel.org>, 1118437@bugs.debian.org, netdev@vger.kernel.org, bpf@vger.kernel.org
- Subject: Bug#1118437: null pointer dereference in interrupt after receiving an ip packet on veth from xsk from user space
- From: Jason Xing <kerneljasonxing@gmail.com>
- Date: Tue, 21 Oct 2025 19:02:06 +0800
- Message-id: <[🔎] CAL+tcoA0TKWQY4oP4jJ5BHmEnA+HzHRrgsnQL9vRpnaqb+_8Ag@mail.gmail.com>
- Reply-to: Jason Xing <kerneljasonxing@gmail.com>, 1118437@bugs.debian.org
- In-reply-to: <[🔎] d8808206-0951-4512-91cb-58839ba9b8c4@nop.hu>
- References: <[🔎] 0435b904-f44f-48f8-afb0-68868474bf1c@nop.hu> <[🔎] CAL+tcoA5qDAcnZpmULsnD=X6aVP-ztRxPv5z1OSP-nvtNEk+-w@mail.gmail.com> <[🔎] 643fbe8f-ba76-49b4-9fb7-403535fd5638@nop.hu> <[🔎] CAL+tcoDqgQbs20xV34RFWDoE5YPXS-ne3FBns2n9t4eggx8LAQ@mail.gmail.com> <[🔎] d8808206-0951-4512-91cb-58839ba9b8c4@nop.hu> <[🔎] 176091056328.779313.4901801207060344593.reportbug@noti>
On Tue, Oct 21, 2025 at 5:31 AM mc36 <csmate@nop.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
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