Upgrading 1.14 to 1.18.1 -- Cannot allocate memory?

[Leonard J. Peirce]

I am testing the upgrade from 1.14 to 1.18.1.  I copy the database
directory over and attempt to start krb5kdc and kadmind but both
fail.  Syslog shows for krb5kdc

    Cannot allocate memory - while creating main loop

For kadmind it shows

    Cannot allocate memory while initializing network, aborting

I'm running 1.18.1 that I"ve built from source on CentOS Linux 7.8.

Am I the only one seeing this?

Thanks...

- Leonard