Bug#819290: systemd[1]: Caught <ABRT>, dumped core ...

[Yuriy M. Kaminskiy]

Disclaimer: not a systemd maintainer.
 > 2.) A.)
Unfortunately, backtrace without symbol information is not exactly 
useful, especially since introduction of ASLR. If you kept core, please 
install systemd-dbg/-dbgsym package and redo gdb backtrace.

 > If I understand correctly Lennart might look into this when version 
4.5 of the kernel is out[1].

Unless you use systemd.unified_cgroup_hierarchy=1, this is *NOT* your 
issue (some symptoms maybe /looks/ similar, but effects in 2.B.,.C,.D,.E 
are exactly same in about /any/ systemd crash), and Lennart note about 
4.5 kernel does not apply to you.

P.S. I might note that the way systemd handles crashes is not quite 
suitable for any production system :-|
Considering complexity (and likelihood of bugs), it should do something 
less drastic.