Hello,

I am using NetBSD 1.5.2 i386 with an isapnp SoundBlaster16, the MPU-401
MIDI UART is on /dev/rmidi0.  I am tinkering with csound and midi.

Csound reads from /dev/rmidi0 and works great.  After about 10 or 15
minutes, csound locks up.  I've reproduced this 4 times.  Every time
there was more than one note playing, and csound locked up in the middle
of the notes.  The csound program continues to run, it just doesn't
receive the note-off's or any other midi events.

Using gdb, I jumped to a routine to explicitly close the file
descriptor for /dev/rmidi0.  I built the kernel with DEBUG_AUDIO and
DEBUG_MIDI options enabled, and the only message was when I killed
csound, "audio_sleep: woke up st=-1".

After csound terminates, trying to open /dev/rmidi0 returns an error,
errno == EIO.  After a few minutes, I am able to open /dev/rmidi0, but I
don't receive any input.  However, at that point midiplay can play music
through the MPU-401.  Can anyone give me advice for troubleshooting this?

Thanks,
Ben