On 1/27/20 9:17 AM, Stefano Garzarella wrote: > Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx> You're not reaping CQ events, and hence you overflow the ring. Once overflown, an attempt to submit new IO will returns in a -16/-EBUSY return value. This is io_uring telling you that it won't submit more IO until you've emptied the completion ring so io_uring can flush the overflown entries to the ring. -- Jens Axboe
