In logfile /var/log/samba/log.winbindd-dc-connect I see a continuously increasing stream of the error message:

ldb: unable to stat module /usr/lib64/samba/ldb : No such file or directory

I'm not certain where it is coming from. The only reference to the error I could find on google was a Redhat bug that was fixed several years ago:

Any ideas how to correct this issue?