I am going to try and change the "invalid" status for pulseaudio and
alsa-tools.

alsa-tools, pulseaudio -- please re-evaluate.  The primary issue seems
to be that the alsa-tools are trying to find a pulseaudio daemon that is
no longer running after the user has chosen to shutdown or reboot.  It
seems to me that amixer or aplay ought not try to access a pulseaudio
process that doesn't exist.

(The hang which is avoided by shutting down the network helps illuminate
the issue, but it isn't the cause.)

-- 
MASTER storing ALSA mixer element values during shutdown hangs 
nondeterministically if non-loopback network interfaces are still up
https://bugs.launchpad.net/bugs/274995
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