linux-kernel - Re: USB-Audio: Device or resource busy (strace log)

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Message-ID: <41bebccc-7940-8379-0108-047bd1cc92f9@perex.cz>
Date:   Wed, 11 Aug 2021 14:46:20 +0200
From:   Jaroslav Kysela <perex@...ex.cz>
To:     Muni Sekhar <munisekharrms@...il.com>,
        alsa-devel <alsa-devel@...a-project.org>,
        linux-usb@...r.kernel.org, linux-sound@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        kernelnewbies <kernelnewbies@...nelnewbies.org>
Subject: Re: USB-Audio: Device or resource busy (strace log)

On 11. 08. 21 14:36, Muni Sekhar wrote:
> Hi All,
> 
> $ cat /proc/asound/cards
>  0 [USB            ]: USB-Audio - Plantronics .Audio 628 USB
>                       Plantronics Plantronics .Audio 628 USB at
> usb-0000:00:14.0-2, full speed
> 
> I am using a Plantronics USB Audio headset.
> 
> $ arecord --device hw:0,0 --channels 2 --format S16_LE --rate 44100Hz x.wav
> arecord: main:722: audio open error: Device or resource busy
> 
> 
> 'arecord' command always fails the first time after system boot in my
> system. But subsequent execution of the 'arecord' command runs fine.
> 
> 
> I've attached the strace log for the "audio open error: Device or
> resource busy" failure. Is there any fix available for this issue?

You may check which other task blocks the PCM device:

  lsof /dev/snd/pcmC0D0c

I guess that it will be pulseaudio (device enumeration).

					Jaroslav

-- 
Jaroslav Kysela <perex@...ex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.