Race condition in poll_for_response results in event not being delivered
In function poll_for_response, if a event arrives after poll_for_event and before xcb_poll_for_reply64, that event will be read in xcb_poll_for_reply64, but not be put into Xlib's queue. This can be a big problem if the application proceed to block on select() because it thinks no events are available.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information