[Bug 194727] New: 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

            Bug ID: 194727
           Summary: uaudio device gets disconnected, and hangs usb until
                    everything using /dev/mixer* is closed
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: freebsd-usb at FreeBSD.org
          Reporter: tcberner at gmail.com

Hi

I'm using a pair of KEF X300A speakers, which get recognized by the uaudio
driver. 

Sporadically get: 
uaudio0: at uhub4, port 2, addr 3 (disconnected)
pcm0: unregister: channel pcm0:virtual:dsp0.vp0 busy (pid 2204)
pcm0: Waiting for sound application to exit!
pcm0: unregister: channel pcm0:virtual:dsp0.vp0 busy (pid 2204)
pcm0: Waiting for sound application to exit!
pcm0: unregister: channel pcm0:virtual:dsp0.vp0 busy (pid 2204)
pcm0: Waiting for sound application to exit!
[... -- closing/killing the concerning the application]
pcm0: Waiting for sound application to exit!
pcm0: unregister: mixer busy
pcm0: Waiting for sound application to exit!
pcm0: unregister: mixer busy
[repeat at infinitum]



The usb-stack seems to be completly hung at this point (usbconfig&friends hang)
-- until I close everything else that has /dev/mixer* open. Then the device
seems to reattach and gets usable again.

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