/dev/dri/renderD128 is leaking its file descriptor

I have noticed crashes during the user being out of file descriptors, the output being the following.

(process:18581): GLib-ERROR **: 08:46:32.622: Creating pipes for GWakeup: No file descriptors available

I have ultimately traced this back to /dev/dri/renderD128 being opened now for 129 times, after about twelve hours of operation. I was yet unable to get this to run under valgrind on Alpine Linux, as it looks like valgrind itself now has a bug too, which prevents it from running due to a memory error.

I'll make a sincere attempt in getting more information on this issue. I reproduce it by playing video's under Xorg with the following options.

export QT_MEDIA_BACKEND=ffmpeg
export LIBVA_DRIVER_NAME=nothing

I have limited this down to systems having the iHD graphics cards, hence the newer intel drivers. Reproduction is fully possible for me on a single system, but I have not yet been able to run valgrind on it.