Hi, I implemented SQPOLL in netty for 5.8/5.9, to close a fd I need to delete the entry first, it seems to fail with error -EADDRINUSE when I remove the fd entry, close(2) it and the same socket(with the same address) is created again,, is that known? I assume that io_uring still has some reference to this, however io_uring_unregister_files works fine but the drawback would be that I need to wait until the ring is idle example: https://gist.github.com/1Jo1/53d01c4c2172bb0762b5dbcf9ef9c623 --- Josef