Attaching an xdp program to a veth interface may lead to a kernel OOPS in
openSUSE Leap 15.3 (and most probably in SLES 15.3, too).

To reproduce the crash, run the following command in multiple parallel loops:

docker run --rm --privileged -v /tmp/bpf:/tmp/bpf builder15-3 ip link set eth0
xdp obj /tmp/bpf/kern.o sec xdp


On our development machine (72 cores), I managed to get the crash within 1 to
20 minutes when starting 16 parallel loops.

/tmp/bpf/kern.o can be a trivial xdp program (e.g. "return XDP_PASS")


# uname -a
Linux uranos 5.3.18-59.19-default #1 SMP Tue Aug 3 14:11:23 UTC 2021 (055c4fd)
x86_64 x86_64 x86_64 GNU/Linux


I reproduced this behavior multiple times, the lower part of the backtrace
always differs, but it always ends up in "veth_poll+0x337".

I'll attach different dmesg.txt files. Two of them contain an unsupported
module (mxm_wmi), but I disabled it as soon as I noticed, so it has nothing to
do with the crash.