[is_taken]

Are you sure the memory in this system is ok?

As it dumped core, could be interesting to "gdb it" and get a stackframe.

[mhkool]

The systemd config is default and it should dump core and logs a message that it dumped core but I have not been able to find it. Usually core dumps are in /var/lib/systemd/coredump but the directory is empty.

The server has ECC memory and there are no messages in the syslog about ECC failures. The SEGV occurred on two consecutive days when systemd was reloading so for the moment I find it unlikely that memory may be the root cause but looking at a core dump would certainly help. Where is it?

[is_taken]

Try this:

  find / -name '*core*'