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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0. If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+Notes for BIND 9.16.1
+---------------------
+
+Known Issues
+~~~~~~~~~~~~
+
+- UDP network ports used for listening can no longer simultaneously be
+ used for sending traffic. An example configuration which triggers
+ this issue would be one which uses the same address:port pair for
+ ``listen-on(-v6)`` statements as for ``notify-source(-v6)`` or
+ ``transfer-source(-v6)``. While this issue affects all operating
+ systems, it only triggers log messages (e.g. "unable to create
+ dispatch for reserved port") on some of them. There are currently no
+ plans to make such a combination of settings work again.
+
+- See :ref:`above <relnotes_known_issues>` for a list of all known
+ issues affecting this BIND 9 branch.
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- The system-provided POSIX Threads read-write lock implementation is
+ now used by default instead of the native BIND 9 implementation.
+ Please be aware that glibc versions 2.26 through 2.29 had a
+ `bug <https://sourceware.org/bugzilla/show_bug.cgi?id=23844>`__ that
+ could cause BIND 9 to deadlock. A fix was released in glibc 2.30, and
+ most current Linux distributions have patched or updated glibc, with
+ the notable exception of Ubuntu 18.04 (Bionic) which is a work in
+ progress. If you are running on an affected operating system, compile
+ BIND 9 with ``--disable-pthread-rwlock`` until a fixed version of
+ glibc is available. :gl:`!3125`
+
+Bug Fixes
+~~~~~~~~~
+
+- Fixed re-signing issues with inline zones which resulted in records
+ being re-signed late or not at all.