[Bug 194727] uaudio device gets disconnected, and hangs usb until everything using /dev/mixer* is closed

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194727

--- Comment #33 from Ed Maste <emaste at freebsd.org> ---
Observing similar behaviour, at r360105. Accidentally unplugged then replugged
hub with a USB audio interface:

May  2 20:28:46 nazar kernel: ugen0.11: <Focusrite Scarlett 2i2 USB> at usbus0
(disconnected)
May  2 20:28:46 nazar kernel: uaudio1: at uhub2, port 3, addr 22 (disconnected)
May  2 20:28:46 nazar kernel: pcm3: unregister: channel pcm3:virtual:dsp3.vr0
busy (pid 12814)
May  2 20:28:46 nazar kernel: pcm3: Waiting for sound application to exit!
May  2 20:28:55 nazar kernel: pcm3: unregister: channel pcm3:virtual:dsp3.vr0
busy (pid 12814)
May  2 20:28:55 nazar kernel: pcm3: Waiting for sound application to exit!
...

usbconfig no longer works:

# usbconfig list
load: 1.25  cmd: usbconfig 1407 [USB config SX lock] 6.56r 0.00u 0.00s 0% 2600k
^C
# 

and the USB Ethernet dongle plugged into the hub did not reattach. Once I
exited the program that had the audio device open (obs-studio) the audio
interface and USB Ethernet re-attached.

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