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kern/39204: pad(4) device doesn't emit PCM data

>Number:         39204
>Category:       kern
>Synopsis:       pad(4) device doesn't emit PCM data
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 25 08:55:00 +0000 2008
>Originator:     Aleksej Saushev
>Release:        NetBSD 4.99.67 i386
NetBSD 4.99.67 i386
I'm trying to capture data sent to audio device.
After pad(4) reading /dev/pad0 should emit PCM data fed to /dev/sound0,
I run
        hexdump -C /dev/pad0 & mplayer some.mp3
and don't see any data. Starting in different order doesn't
affect the overall result.

dmesg reports following:

pad0: cv_timedwait_sig returned -3

hexdump -C /dev/pad0 & mplayer -quiet some-audio-file

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