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[Samba] samba 4.7.3 DLZ performance regression


I'm seeing a huge performance regression with Samba 4.7.3 DLZ and BIND 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.4.  If I remove DLZ external DNS requests are a few ms.  If it is enabled then internal and external DNS requests are a 1-3 seconds or timeout.  Downgrading BIND had no effect.

I reverted just the DLZ modules back to 4.7.0 and performance is back to normal:

# cp /usr/src/samba-4.7.0/bin/modules/bind9/dlz_bind9* /usr/local/samba/lib/bind9
# echo 'export LDB_MODULES_PATH=/usr/src/samba-4.7.0/bin/modules/ldb' >> /etc/sysconfig/named
# service named restart


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