With Linux 6.12.9+, there is an explicit check whether "reuse port" is a valid option for a socket, and it's apparently not a valid option for Unix domain sockets: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/diff/net/core/sock.c?id=v6.12.9&id2=v6.12.8

However, the Socket::bind_internal function in this crate unconditionally sets reuse_port(true) on all created sockets. For Unix domain sockets, this is invalid, and now just always fails - bubbles up an IO error.

This is a minimal reproducer:

use tokio_uring::net::UnixListener;

fn main() {
    let sock_file = "/tmp/tokio-uring-unix-test.sock";
    UnixListener::bind(sock_file).unwrap();
}

It looks like sys_listener.set_reuse_port(true) should only be called in Socket::bind_internal if the socket type is NOT a Unix socket.