When I followed the instructions in this question to find zombie processes, I found this process Z Jan02 0:00 [sd_cicero] <defunct>
. When I try to find its parent process, I get this:
systemd(1)───lightdm(1305)───lightdm(1524)───upstart(1797)───sd_cicero(4795)───sd_cicero(4796)
What is this process, and why could it have become a zombie?