+5452. [bug] The "blackhole" ACL was accidentally disabled with
+ respect to client queries. [GL #1936]
+
5449. [bug] Fix a socket shutdown race in netmgr udp. [GL #1938]
5448. [bug] Fix a race condition in isc__nm_tcpdns_send().
unsupported algorithm appeared earlier in the DNSKEY RRset than a
supported algorithm. It could also stop if it detected a malformed
public key. [GL #1689]
+
+- The ``blackhole`` ACL was inadvertently disabled with respect to
+ client queries. Blocked IP addresses were not used for upstream
+ queries but queries from those addresses could still be answered.
+ [GL #1936]