[PATCH] epoll: try to be a _bit_ better about file lifetimes

[Linus Torvalds]

On Fri, 3 May 2024 at 14:45, Al Viro <viro at zeniv.linux.org.uk> wrote:
>
> How do you get through eventpoll_release_file() while someone
> has entered ep_item_poll()?

Doesn't matter.

Look, it's enough that the file count has gone down to zero. You may
not even have gotten to eventpoll_release_file() yet - the important
part is that you're on your *way* to it.

That means that the file will be released - and it means that you have
violated all the refcounting rules for poll().

So I think you're barking up the wrong tree.

                  Linus