Hi list, I think I found a race condition somewhere in the netgraph subsystem It can be reproduced around 80% of the time on any 4.8 through 4.9-RC to 5.1-RELENG, possibly earlier. 4.7 IFIRC did not have the problem. If you start two mpd processes immediately one after another listening on different IPs with different interface ranges (ng1-ng32) and (ng33-ng64) you get a hang. Currently running processes continue to run. New processes cannot be created. mpd instances cannot be killed. I have also noticed that if you start and stop an mpd now you get a ng0 interface left after mpd exits. Brgds, A.