From owner-freebsd-usb@freebsd.org Sun Jul 23 16:32:39 2017 Return-Path: Delivered-To: freebsd-usb@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2372BDA50C6 for ; Sun, 23 Jul 2017 16:32:39 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 0A25A66E0F for ; Sun, 23 Jul 2017 16:32:39 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v6NGWcl1061811 for ; Sun, 23 Jul 2017 16:32:38 GMT (envelope-from bugzilla-noreply@freebsd.org) 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 Date: Sun, 23 Jul 2017 16:32:39 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: usb X-Bugzilla-Version: 11.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: yuri@rawbw.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-usb@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-usb@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: FreeBSD support for USB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Jul 2017 16:32:39 -0000 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.=