[4.0.1.48][4.1.0.23][4.4.0.64][4.5.0.16][5.0.0.29] No notification sounds (ringing, SMS, alarm)

Nice analysis!

I also got one today. There was a difference though, in that there were 7 threads, but the 7th thread was still in that gst_ preroll, part.

Here’s the lsof -p, bt and bt full for all threads Ubuntu Pastebin

For the lsof part, I would like to understand if that is always the case, that when locked, ngfd still holds a file descriptor for the audio to be played. That would give us a chance to create a watchdog, if the same state/file is observed for a larger than, say, 30s period.
You can see that I received a mail just from that ogg filename…:wink:

(@elkiaer pretty sure there was no bluetooth audio device when the deadlock of ngfd happened to me.
I’m sure there’s a software problem, like a race, inside ngfd’s usage of gstreamer, that comes up as gst locking (or, gst has a bug) )