Zhi-Wei Lu wrote:
> Hi,
> 
> I am applying the latest updates to a number of systems, those with LDAP
>    configured failed to boot at "Start system message bus",  those
> without LDAP configured booted just fine!
> 
> Any suggestion?
> 

It may be this:-

https://bugzilla.redhat.com/show_bug.cgi?id=206399

I had this and fixed it by setting in /etc/ldap.conf:-

nss_initgroups_ignoreusers root,ldap,named,avahi,haldaemon,dbus

Hope this helps.