[REGRESSION] 5.15.88 and onwards no longer return EADDRINUSE from bind

Hi all,

I'm facing the same issue as https://lore.kernel.org/stable/CAFsF8vL4CGFzWMb38_XviiEgxoKX0GYup=JiUFXUOmag..., but on 5.15. I've bisected it across releases to 5.15.88, and can reproduce on 5.15.93.

However, I cannot seem to find the identified problematic commit in the 5.15 branch, so I'm unsure if this is a different issue or not.

There's a few ways to reproduce this issue, but the one I've been using is running libuv's (https://github.com/libuv/libuv) tests, specifically tests 271 and 277.

#regzbot introduced v5.15.88..

Thanks, Winter