just subscribed to the list (I hope).
while troubleshooting a different thing in audio I stumbled across the following and it's in the logs more than once.
what do you need from me? this is opensuse 15.1 leap.
warn:2019-07-31T19:12:58.207893+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: Most likely this is a bug in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA developers. warn:2019-07-31T19:12:58.208183+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: snd_pcm_dump(): warn:2019-07-31T19:12:58.208473+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: Hardware PCM card 2 'USB Audio CODEC' device 0 subdevice 0 warn:2019-07-31T19:12:58.208760+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: Its setup is: warn:2019-07-31T19:12:58.209071+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: stream : CAPTURE warn:2019-07-31T19:12:58.209366+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: access : MMAP_INTERLEAVED warn:2019-07-31T19:12:58.209671+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: format : S16_LE warn:2019-07-31T19:12:58.209958+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: subformat : STD warn:2019-07-31T19:12:58.210245+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: channels : 2 warn:2019-07-31T19:12:58.210588+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: rate : 48000 warn:2019-07-31T19:12:58.210880+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: exact rate : 48000 (48000/1) warn:2019-07-31T19:12:58.211198+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: msbits : 16 warn:2019-07-31T19:12:58.211746+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: buffer_size : 88200 warn:2019-07-31T19:12:58.212028+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: period_size : 44100 warn:2019-07-31T19:12:58.212261+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: period_time : 918750 warn:2019-07-31T19:12:58.212548+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: tstamp_mode : ENABLE warn:2019-07-31T19:12:58.212785+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: tstamp_type : MONOTONIC warn:2019-07-31T19:12:58.213014+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: period_step : 1 warn:2019-07-31T19:12:58.213238+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: avail_min : 44100 warn:2019-07-31T19:12:58.213470+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: period_event : 0 warn:2019-07-31T19:12:58.213722+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: start_threshold : -1 warn:2019-07-31T19:12:58.213995+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: stop_threshold : 6206523236469964800 warn:2019-07-31T19:12:58.214465+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: silence_threshold: 0 warn:2019-07-31T19:12:58.214730+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: silence_size : 0 warn:2019-07-31T19:12:58.214971+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: boundary : 6206523236469964800 warn:2019-07-31T19:12:58.215228+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: appl_ptr : 45284903 warn:2019-07-31T19:12:58.215510+02:00 taplop pulseaudio[28164]: [alsa-source-USB Audio] alsa-util.c: hw_ptr : 55414415 warn:2019-07-31T21:55:16.513279+02:00 taplop pulseaudio[28164]: [alsa-sink-USB Audio] alsa-util.c: Got POLLNVAL from ALSA warn:2019-07-31T21:55:16.513748+02:00 taplop pulseaudio[28164]: [alsa-sink-USB Audio] alsa-util.c: Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): No such device