USB Audio

[Steve Webster]

Greetings,

I'm a newbie to FreeBSD, so please forgive me if I've posted to the wrong 
list.

I'm trying to use an Audiotrak OptoPlay usb audio device, one that appears 
as supported hardware in the handbook, in conjunction with mplayer. It 
works great for tens of minutes and then it forces a reboot leading the 
the following snippet in /var/log/messages:

> FreeBSD 5.4-RELEASE #3: Sat Sep 24 16:54:39 EDT 2005
> ugen0: Ego Systems Inc. AUDIOTRAK OptoPlay, rev 1.00/1.00, addr 2
> WARNING: / was not properly dismounted
> WARNING: /tmp was not properly dismounted
> WARNING: /usr was not properly dismounted
> WARNING: /var was not properly dismounted
> ugen0: at uhub0 port 1 (addr 2) disconnected
> ugen0: detached
> uaudio0: Ego Systems Inc. AUDIOTRAK OptoPlay, rev 1.00/1.00, addr 2
> uaudio0: audio rev 1.00
> pcm0: <USB Audio> on uaudio0
> usb0: isoc TD alloc failed
> usb0: isoc TD alloc failed
> panic: kmem_malloc(4096): kmem_map too small: 42991616 total allocated
> Uptime: 1h43m40s
> Cannot dump. No dump device defined.
> Automatic reboot in 15 seconds - press a key on the console to abort

I've done some research that has pointed at pcm and snd_uaudio things, but 
I haven't found anything conclusive. The warnings above are probably 
related to the machine coming down hard since this log is from the second 
time the machine automatically rebooted. I appear to have a memory leak, 
but I was wondering if others on this list had some pointers. I wanted to 
try rebuilding a kernel from the stable branch, and I wanted to apply the 
patch found at http://staff.mybsd.org.my/skywizard/FreeBSD/sound/, but 
everything I've read has mentioned to rebuild world if I change from 
release to stable. This machine needs to be production quality, so I'm 
wary as to which course of action to take.

Thanks in advance,
Steve