On a recent Leap 42.2 install, after applying the last round of updates and
rebooting the system, I get a black screen instead of the SDDM greeter.

System logs show:

2016-12-02T08:49:52.937290+01:00 linux systemd-coredump[1297]: Process 460
(plymouthd) of user 0 dumped core.
2016-12-02T08:50:09.705204+01:00 rofl systemd-coredump[2023]: Process 1974
(sddm-greeter) of user 481 dumped core.

Running "systemctl restart display-manager" on VT1 as root, once, brings up the
greeter, and everything seems to be fine then. But the issue reoccurs when I
reboot a second time.

I used the system with an uptime of >3 days before, and did not encounter this
issue previously.

Among the updates applied, was a new xorg-x11-server package, and kernel 4.8.11
(from the "official"
http://download.opensuse.org/repositories/Kernel:/stable/standard/ repository)
- that kernel repository was in use before with a slightly older 4.8.x, so I
don't think that's the culprit.

I'll attach the two /var/lib/systemd/coredump/ files created.