Hi! I build my own kernel, and I set TIPC as enabled long ago thinking it was something many applications depend on. After I upgraded to 5.1.5, I noticed lots of errors in my systemd log and that Firefox couldnt start any of its subprocesses:
NET: Registered protocol family 30 Failed to register TIPC socket type rtkit-daemon.service: Failed to set up network namespacing: File exists The "Failed to register" message was repeated many many times. Many other strange problems occured until I set TIPC to compile as a module instead. I believe this is a bug related to one of the recent TIPC commits. If you need any other debugging info or have somewhere else I should report this, let me know.