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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 9.16.39
+----------------------
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- libuv support for receiving multiple UDP messages in a single
+  ``recvmmsg()`` system call has been tweaked several times between
+  libuv versions 1.35.0 and 1.40.0; the current recommended libuv
+  version is 1.40.0 or higher. New rules are now in effect for running
+  with a different version of libuv than the one used at compilation
+  time. These rules may trigger a fatal error at startup:
+
+  - Building against or running with libuv versions 1.35.0 and 1.36.0 is
+    now a fatal error.
+
+  - Running with libuv version higher than 1.34.2 is now a fatal error
+    when :iscman:`named` is built against libuv version 1.34.2 or lower.
+
+  - Running with libuv version higher than 1.39.0 is now a fatal error
+    when :iscman:`named` is built against libuv version 1.37.0, 1.38.0,
+    1.38.1, or 1.39.0.
+
+  This prevents the use of libuv versions that may trigger an assertion
+  failure when receiving multiple UDP messages in a single system call.
+  :gl:`#3840`
+
+Bug Fixes
+~~~~~~~~~
+
+- :iscman:`named` could crash with an assertion failure when adding a
+  new zone into the configuration file for a name which was already
+  configured as a member zone for a catalog zone. This has been fixed.
+  :gl:`#3911`
+
+- When :iscman:`named` starts up, it sends a query for the DNSSEC key
+  for each configured trust anchor to determine whether the key has
+  changed. In some unusual cases, the query might depend on a zone for
+  which the server is itself authoritative, and would have failed if it
+  were sent before the zone was fully loaded. This has now been fixed by
+  delaying the key queries until all zones have finished loading.
+  :gl:`#3673`
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+  <relnotes_known_issues>` for a list of all known issues affecting this
+  BIND 9 branch.