--- Comment #1 from Edward Tomasz Napierala <[hidden email]> ---
So, the way it works right now is that for current process - and that process
only - linprocfs provides a symlink from /proc/self/fd to /dev/fd.
Making this work properly would require adding file descriptor knowledge to
procfs itself; possibly to pseudofs.
The current behaviour breaks tty(1) and a recent screen(1).