On Mon, 25 Apr 2022 16:49:34 +0200 Jann Horn wrote:

quoted

Doesn't mean we should make it legal. We can add a warning to catch
abuses.  

That was the idea with
https://lore.kernel.org/netdev/20220128014303.2334568-1-jannh@google.com/ (local),
but I didn't get any replies when I asked what the precise semantics
of dev_hold() are supposed to be
(https://lore.kernel.org/netdev/CAG48ez1-OyZETvrYAfaHicYW1LbrQUVp=C0EukSWqZrYMej73w@mail.gmail.com/ (local)),
so I don't know how to proceed...

Yeah, I think after you pointed out that the netdev per cpu refcounting
is fundamentally broken everybody decided to hit themselves with the
obliviate spell :S