https://bugs.openldap.org/show_bug.cgi?id=10099
--- Comment #3 from AllenM amcwongahey@rbbn.com --- It was the user process. But it was hanging inside the openLDAP library right after calling ldap_sasl_bind.
As I stated before it never came back from this function call and that is clearly inside openLDAP.
I added tons of debug to openLDAP to isolate this down so please see my added comment where I found a delta in the compile flags in OpenLDAP between version 2.4.59 and 2.5.xx. Adding the compile flags back in PREVENTS the lockup.