[Bug 265121] system will get stuck when dragonfly DAC plugged in and being used

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265121

            Bug ID: 265121
           Summary: system will get stuck when dragonfly DAC plugged in
                    and being used
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jon@xyinn.org

Hey all,

I'm running 13.1-RELEASE FreeBSD 13.1-RELEASE releng/13.1-n250148-fc952ac2212
GENERIC amd64 on a Thinkpad X260. When using a Dragonfly DAC (USB), the audio
plays fine and all, but if the device happens to be plugged in and being used
in any capacity by any process (Even if the music is paused), doing a suspend
(zzz) will cause the system to wait for the process using the audio device to
stop. However, this never happens to essentially you end up with a stuck
system. I can switch ttys but since the system is in the middle of a suspend,
no keyboard input is accepted. The only way out if to hard power off.

Device: 

ugen0.3: <AudioQuest AudioQuest DragonFly Cobalt v1.0> at usbus0 (disconnected)
uaudio0: at uhub0, port 2, addr 2 (disconnected)

This is the message I get (loops forever):

pcm3: unregister: channel pcm3:virtual:dsp3.vp0 busy (pid 23287)
pcm3: Waiting for sound application to exit!

I think for these situations, it may be fine to have a timeout where the
process gets killed. I could see how some people may think that's a dangerous
operation however so I'm open to other workarounds, but I don't think it just
waiting forever it acceptable.

- Jonathan

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