Bug? Strange crash with snd_hdspm and RME RayDAT on MIDI-input

[AiO]

Hello there,

I've tried to find some insights in a weird problem I have with 
snd_hdspm. I guess it is an error-report/bug-posting.

Audio-wise everything is super-duper, so don't worry. However... MIDI 
only works outbound from the on-board MIDI interface.

MIDI-out always works perfectly from the card during normal operations.

Whenever I connect anything to the MIDI-in and start feeding some 
MIDI-data, it seems ALSA crashes on me. here's a more detailed description:

* I'm running linux-rt 6.0.5.14.realtime1-3-rt #1 SMP PREEMPT_RT (Arch)

* When i give it a stream of MIDI data on the MIDI-in while playing
   some audio that application (e.g. mplayer or live inputs) logs:

   ALSA: poll time out, polled for 1999005 usecs, Retrying with a
   recovery, retry cnt = 1 (2, 3, 4, 5, and so on)

   And ALSA seem stuck in looping the last buffer over and over.

* Nothing in journal, nothing in dmesg tells anything more about it

What did I run in to?! :)

Kind regards,
AiO