Comment 7 for bug 1824103

Yes, this is because the alsa-lib has a new change but the pulseaudio has not changed accordingly.

commit 93e03bdc2a3dcd5d12516f5de78e14d88a32ff2c
Author: Jaroslav Kysela <email address hidden>
Date: Wed Apr 4 09:58:12 2018 +0200

    alsa.conf: change the location for add-on configs to /etc/alsa/conf.d

    The add-on configuration files should be placed to a volatile place.

    Signed-off-by: Jaroslav Kysela <email address hidden>

The steps to reproduce it:
install ubuntu 19.04 on a machine (any machines with audio capablilities)
after booting up, cd /tmp; arecord test.wav; aplay test.wav, then the aplay will fail. And from then on, both aplay and arecord can't work anymore.