panic: devbuf: malloc limit exceeded

[Matthew Dillon]

:I got this crash while playing music over pcm0 (the USB device):
:
:...
:This GDB was configured as "i386-dragonfly"...
:panic: devbuf: malloc limit exceeded
:panic messages:
:---
:panic: devbuf: malloc limit exceeded
:
:syncing disks... 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15
:15 15 
:giving up on 15 buffers

    Clearly a memory leak.  To help track this down please run a kernel
    with the following options:

    options	KTR
    options	KTR_ALL

    When you get the crash dump, run ktrdump on the core:

    ktrdump -a -N kernel.X -M vmcore.X

    I'm hoping this will give us the smoking gun.

						-Matt