found in
https://lists.debian.org/debian-kernel/2025/12/msg00223.html

Roland did bisect the changes between 5.10.244 to 5.10.247 and found
that the issue is introduced with 1550f3673972 ("net: rtnetlink: add
bulk delete support flag") which is the backport to the 5.10.y series.
Is there soemthing missing?

Roland I think it would be helpful if you can test as well more recent
stable series versions to confirm if the issue is present there as
well or not, which might indicate a 5.10.y specific backporting
problem.

#regzbot introduced: 1550f3673972c5cfba714135f8bf26784e6f2b0f

Regards,
Salvatore[regression 5.10.y] Libvirt can no longer delete macvtap devices after backport of a6cec0bcd342 ("net: rtnetlink: add bulk delete support flag") to 5.10.y series (Debian 11)Salvatore Bonaccorso <carnil@debian.org> undefinedRoland Schwarzkopf <rschwarzkopf@mathematik.uni-marburg.de>, Nikolay Aleksandrov <razor@blackwall.org>, David Ahern <dsahern@kernel.org>, "David S. Miller" <davem@davemloft.net>, Sasha Levin <sashal@kernel.org> undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined­