wild guess, but can this have something to do with not explicitly setting SCHED_OTHER when launching a thread from a SCHED_FIFO pd thread?
Good guess, i think, although then only vasp may be affected, not fftease which is normally not compiled with FLEXT_THREADS defined. Flext starts a helper thread at startup and sets a lower priority. I'm grateful for any advice how to avoid the watchdog hickups!
best greetings, Thomas