Comment 22 for bug 1705345

Ah, I was able to recreate the problem of 'plymouth --ping' hanging with the following test case on an Ubuntu 16.04 system.

1) Run 'sudo /sbin/plymouthd --mode=boot --attach-to-session --pid-file=/run/plymouth/pid'
2) Observe plymouthd is running ('ps aux | grep plymouth')
3) stop the plymouthd process 'sudo kill -STOP $PID'
4) Run 'plymouth --ping --debug'

bdmurray@clean-xenial-amd64:~$ plymouth --ping --debug
[ply-event-loop.c:759] ply_event_loop_stop_watching_fd:stopping watching fd 6
[ply-event-loop.c:775] ply_event_loop_stop_watching_fd:removing destination for fd 6