Date: Sun, 23 Jul 2017 16:32:39 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-usb@FreeBSD.org Subject: [Bug 220949] When the only USB soundcard is disconnected, defunct /dev/dsp0 is left, kernel warnings, programs hang Message-ID: <bug-220949-17@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220949 Bug ID: 220949 Summary: When the only USB soundcard is disconnected, defunct /dev/dsp0 is left, kernel warnings, programs hang Product: Base System Version: 11.0-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: usb Assignee: freebsd-usb@FreeBSD.org Reporter: yuri@rawbw.com I have a USB webcam that is also a soundcard with only a microphone, and no speaker. When there are no other audio devices, disconnecting this USB webc= am causes system dysfunction. There are a lot of repeating messages in log: > Jul 23 09:14:21 yv kernel: pcm0: unregister: mixer busy > Jul 23 09:14:21 yv kernel: pcm0: Waiting for sound application to exit! > Jul 23 09:14:23 yv kernel: pcm0: unregister: mixer busy > Jul 23 09:14:23 yv kernel: pcm0: Waiting for sound application to exit! Programs that have this device open hanged and became unkillable with kill = -9. 'kldunload snd_uaudio.ko' also hangs in unkillable state. USB is hot-pluggable. Device is supposed to disappear and reappear without = any long-term effects. IMO, /dev/dspN should disappear when device is removed. Programs that have = it opened should behave gracefully. They should only get errors from it and not hang. USB webcam: HD Pro Webcam C920 (vendor 0x046d, product 0x6860) --=20 You are receiving this mail because: You are the assignee for the bug.=
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