This is an update to an earlier report.
The following is documented below. Upon reboot, cupsd is started and pegs one CPU
resets the errant behavior, and cups operates normally.
This is easily repeatable (on my system); it happens whenever the system is rebooted.
After reboot:
ps aux | grep cups
root 826 96.5 0.1 141820 52552 ? Rs 08:33 2:26 /usr/sbin/cupsd -l
root 879 0.0 0.0 95016 208 ? Ssl 08:33 0:00 /sbin/apcupsd
root 892 0.2 0.0 262260 10892 ? Ssl 08:33 0:00 /usr/sbin/cups-browsed
lp 924 0.0 0.0 83956 5740 ? S 08:34 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 926 0.0 0.0 83956 5800 ? S 08:34 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 966 0.0 0.0 83956 5728 ? S 08:34 0:00 /usr/lib/cups/notifier/dbus dbus://
trs 3563 0.7 0.1 361884 52432 pts/4 Sl 08:35 0:00 emacs cups.txt
trs 3576 0.0 0.0 12784 968 pts/4 S+ 08:36 0:00 grep --color=auto cups
systemctl stop cups
ps aux | grep cups
root 879 0.0 0.0 95016 208 ? Ssl 08:33 0:00 /sbin/apcupsd
trs 3563 0.4 0.1 361884 52584 pts/4 Sl 08:35 0:00 emacs cups.txt
trs 3586 0.0 0.0 12784 936 pts/4 S+ 08:37 0:00 grep --color=auto cups
systemctl start cups
ps aux | grep cups
root 879 0.0 0.0 95016 208 ? Ssl 08:33 0:00 /sbin/apcupsd
trs 3563 0.3 0.1 361884 52584 pts/4 Sl 08:35 0:00 emacs cups.txt
root 3593 0.5 0.0 106924 17816 ? Ss 08:37 0:00 /usr/sbin/cupsd -l
lp 3595 0.0 0.0 83956 5676 ? S 08:37 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 3596 0.0 0.0 83956 5632 ? S 08:37 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 3597 0.0 0.0 83956 5712 ? S 08:37 0:00 /usr/lib/cups/notifier/dbus dbus://
trs 3601 0.0 0.0 12784 940 pts/4 S+ 08:37 0:00 grep --color=auto cups
dpkg -l | grep '^ii cups'
ii cups 2.2.1-5
ii cups-browsed 1.11.6-2
ii cups-bsd 2.2.1-5
ii cups-client 2.2.1-5
ii cups-common 2.2.1-5
ii cups-core-drivers 2.2.1-5
ii cups-daemon 2.2.1-5
ii cups-filters 1.11.6-2
ii cups-filters-core-drivers 1.11.6-2
ii cups-pk-helper 0.2.6-1
ii cups-ppdc 2.2.1-5
ii cups-server-common 2.2.1-5