BIND 9.9.1-P2 is now available

Cathy Almond cathya at
Tue Jul 24 18:04:48 UTC 2012


  BIND 9.9.1-P2 is the latest production release of BIND 9.9.

  This document summarizes changes from BIND 9.9.0 to BIND 9.9.1-P2.
  Please see the CHANGES file in the source code release for a complete
  list of all changes.


  The latest versions of BIND 9 software can always be found on our
  web site at There you will find
  additional information about each release, source code, and
  pre-compiled versions for Microsoft Windows operating systems.


  Product support information is available on for paid support options.
  Free support is provided by our user community via a mailing list.
  Information on all public email lists is available at

Security Fixes

- Prevents a named assert (crash) when validating caused by using
  "Bad cache" data before it has been initialized.  [RT #30025]

- ISC_QUEUE handling for recursive clients was updated to address a
  race condition that could cause a memory leak.  This rarely occurred
  with UDP clients, but could be a significant problem for a server
  handling a steady rate of TCP queries.  [RT #29539 & #30233]

- Under heavy incoming TCP query loads named could experience a
  memory leak which could lead to significant reductions in query
  response or cause the server to be terminated on systems with
  "out of memory" killers. [RT #29539]

- A condition has been corrected where improper handling of zero-length
  RDATA could cause undesirable behavior, including termination of
  the named process.  [RT #29644]

New Features

- None

Feature Changes

- BIND now recognizes the TLSA resource record type, created to
  support IETF DANE (DNS-based Authentication of Named Entities)
  [RT #28989]

- A note will be added to the README in future releases to explain
  that the improved scalability provided by using multiple threads
  to listen for and process queries (change 3137, RT #22992) does
  not provide any performance benefit when running BIND on versions
  of the linux kernel that do not include the 'lockless UDP transmit
  path' changes that were incorporated in 2.6.39.  (Some linux
  distributors may have provided this functionality under their own
  version numbering systems).

Bug Fixes

- Fixes the defect introduced by change #3314 that was causing
  failures when saving stub zones to disk (resulting in excessive
  CPU usage in some cases).  [RT #29952]

- The locking strategy around the handling of iterative queries has
  been tuned to reduce unnecessary contention in a multi-threaded
  environment.  (Note that this may not provide a measurable
  improvement over previous versions of BIND, but it corrects the
  performance impact of change 3309 / RT #27995) [RT #29239]

- Addresses a race condition that can cause named to to crash when
  the masters list for a zone is updated via rndc reload/reconfig
  [RT #26732]

- named-checkconf now correctly validates dns64 clients acl
  definitions. [RT #27631]

- Fixes a race condition in zone.c that can cause named to crash
  during the processing of rndc delzone [RT #29028]

- Prevents a named segfault from resolver.c due to procedure
  fctx_finddone() not being thread-safe.  [RT #27995]

- Improves DNS64 reverse zone performance. [RT #28563]

- Adds wire format lookup method to sdb. [RT #28563]

- Uses hmctx, not mctx when freeing rbtdb->heaps to avoid triggering
  an assertion when flushing cache data. [RT #28571]

- Prevents intermittent named crashes following an rndc reload [RT #28606]

- Resolves inconsistencies in locating DNSSEC keys where zone names
  contain characters that require special mappings [RT #28600]

- A new flag -R  has been added to queryperf for running tests using
  non-recursive queries.  It also now builds correctly on MacOS
  version 10.7 (darwin)  [RT #28565]

- Named no longer crashes if gssapi is enabled in named.conf but
  was not compiled into the binary [RT #28338]

- SDB now handles unexpected errors from back-end database drivers
  gracefully instead of exiting on an assert. [RT #28534]

- Prevents named crashes as a result of dereferencing a NULL pointer
  in zmgr_start_xfrin_ifquota if the zone was being removed while
  there were zone transfers still pending [RT #28419]

- Corrects a parser bug that could cause named to crash while reading
  a malformed zone file. [RT #28467]

- Ensures that when a client recurses its status fields are
  consistently set so that named doesn't fail on an INSIST in
  client.c:exit_check. [RT #28346]

- Fixed a problem preventing proper use of 64 bit time values in
  libbind. [RT # 26542]

- isccc/cc.c:table_fromwire could fail to free an allocated object
  on error, leading to a possible memory leak condition. [RT #28265]

- Fixed a build error on systems without ENOTSUP.  [RT #28200]

- The header file isc/hmacsha.h is now installed when building BIND. [RT

- AAAA responses will no longer be returned in the additional section
  when filter-aaaa-on-v4 is in use.  (Prior to this change, they
  would be returned for some query types). [RT #27292]

Thank You

  Thank you to everyone who assisted us in making this release
  possible. If you would like to contribute to ISC to assist us in
  continuing to make quality open source software, please visit our
  donations page at

(c) 2001-2012 Internet Systems Consortium

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