[issue1884] System completely freezes while listening music (devbuf: malloc limit exceeded)

["vasily postnicov \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

vasily postnicov <shamaz.mazum@gmail.com> added the comment:

> If it is then any related memory on usb_blk_freelist will just languish
    there and never get reused.

Indeed. I've compiled kernel with USB_DEBUG and set hw.usb.debug sysctl
parameter to 7. When I use soundcard there are always "usb_block_allocmem: no
free" messages in /var/log/messages. (Signals that new blocks are allocated) But
there are also few "free list size=4096" messages (Already allocated but free
blocks are used). They appear when I JUST START to listen to music (any time
when player is just started).

Any ideas how to explain and fix it?

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DragonFly issue tracker <bugs@lists.dragonflybsd.org>
<http://bugs.dragonflybsd.org/issue1884>
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