can you paste output of
arecord -l (list of capture devices).
Which device you are using and os.
Does this instance is already open by default? like any video playing or
something like that?

Yes you can stop pulse audio and try..

On Wed, Aug 11, 2021 at 6:17 PM Jaroslav Kysela <perex@perex.cz> wrote:

> 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@perex.cz>
> Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
>