sddm crashing with plasma

[Genes Lists <lists@xxxxxxxxxxxx>]

Anyone else seeing this - started after systemd 226 update. It starts 
sometimes - most often crashes on warm reboot - cold reboot seems more 
likely to work. Feels like a threading bug (missing mutex somewhere, or 
a barrier or something).

Symptom: Reboot - sddm won't start.
Log:
ddm-helper[4240]: segfault at 14 ip 000000000042965e sp 00007ffdec4eb3b0 
error 4 in sddm-helper[400000+3a000]

Rebooting cold - will usually get it running again with no errors.