path: root/release-notes/OTP-21.3.README.txt

Patch Package:           OTP 21.3
Git Tag:                 OTP-21.3
Date:                    2019-03-12
Trouble Report Id:       OTP-14702, OTP-15229, OTP-15298, OTP-15369,
                         OTP-15375, OTP-15398, OTP-15423, OTP-15442,
                         OTP-15445, OTP-15447, OTP-15460, OTP-15479,
                         OTP-15484, OTP-15490, OTP-15493, OTP-15494,
                         OTP-15498, OTP-15502, OTP-15503, OTP-15508,
                         OTP-15514, OTP-15518, OTP-15519, OTP-15527,
                         OTP-15529, OTP-15539, OTP-15540, OTP-15541,
                         OTP-15542, OTP-15545, OTP-15552, OTP-15553,
                         OTP-15555, OTP-15556, OTP-15557, OTP-15558,
                         OTP-15561, OTP-15562, OTP-15567, OTP-15569,
                         OTP-15570, OTP-15572, OTP-15576, OTP-15577,
                         OTP-15578, OTP-15580, OTP-15583, OTP-15584,
                         OTP-15586, OTP-15587, OTP-15592, OTP-15599,
                         OTP-15600, OTP-15601, OTP-15602, OTP-15604,
                         OTP-15605, OTP-15619, OTP-15624, OTP-15625,
                         OTP-15629, OTP-15630, OTP-15634, OTP-15637,
                         OTP-15639, OTP-15642, OTP-15650, OTP-15657,
                         OTP-15659, OTP-15660, OTP-15662, OTP-15663,
                         OTP-15665, OTP-15666, OTP-15667, OTP-15669,
                         OTP-15670
Seq num:                 ERIERL-203, ERIERL-231, ERIERL-258,
                         ERIERL-282, ERIERL-298, ERIERL-302,
                         ERIERL-310, ERIERL-316, ERIERL-321, ERL-725,
                         ERL-774, ERL-808, ERL-810, ERL-811, ERL-815,
                         ERL-816, ERL-818, ERL-822, ERL-829, ERL-838,
                         ERL-841, ERL-843, ERL-845, ERL-848, ERL-850,
                         ERL-851, ERL-854, ERL-869
System:                  OTP
Release:                 21
Application:             common_test-1.17, compiler-7.3.2,
                         crypto-4.4.1, dialyzer-3.3.2, diameter-2.2,
                         edoc-0.10, erl_docgen-0.9,
                         erl_interface-3.11, erts-10.3, ftp-1.0.2,
                         hipe-3.18.3, inets-7.0.6, kernel-6.3,
                         mnesia-4.15.6, observer-2.9, odbc-2.12.3,
                         public_key-1.6.5, runtime_tools-1.13.2,
                         ssh-4.7.4, ssl-9.2, stdlib-3.8,
                         syntax_tools-2.1.7, tools-3.1, wx-1.8.7
Predecessor:             OTP 21.2.7

 Check out the git tag OTP-21.3, and build a full OTP system including
 documentation. Apply one or more applications from this build as
 patches to your installation using the 'otp_patch_apply' tool. For
 information on install requirements, see descriptions for each
 application version below.

 ---------------------------------------------------------------------
 --- HIGHLIGHTS ------------------------------------------------------
 ---------------------------------------------------------------------

  OTP-15423    Application(s): ssl

               *** POTENTIAL INCOMPATIBILITY ***

               The Reason part of of the error return from the
               functions connect and handshake has a better and
               documented format. This will sometimes differ from
               previous returned reasons, however those where only
               documented as term() and should for that reason not be
               relied on.


  OTP-15442    Application(s): erl_interface
               Related Id(s): ERIERL-258

               Support for plugin of a user supplied socket
               implementation has been added.


  OTP-15445    Application(s): ssl

               Refactor of state handling to improve TLS application
               data throughput and reduce CPU overhead


  OTP-15460    Application(s): erl_docgen, otp

               The HTML reference documentation shows the OTP version
               where modules and functions were first introduced.
               Versions older than R13B04 are not shown.


  OTP-15529    Application(s): ssl

               The SSL code has been optimized in many small ways to
               reduce CPU load for encryption/decryption, especially
               for Erlang's distribution protocol over TLS.


  OTP-15665    Application(s): ssl
               Related Id(s): ERL-811, PR-2072

               Add support for active N


 ---------------------------------------------------------------------
 --- POTENTIAL INCOMPATIBILITIES -------------------------------------
 ---------------------------------------------------------------------

  OTP-15423    Application(s): ssl

               *** HIGHLIGHT ***

               The Reason part of of the error return from the
               functions connect and handshake has a better and
               documented format. This will sometimes differ from
               previous returned reasons, however those where only
               documented as term() and should for that reason not be
               relied on.


  OTP-15662    Application(s): kernel

               Handler specific configuration parameters for the
               standard handler logger_std_h are changed to be more
               intuitive and more similar to the disk_log handler.

               Earlier there was only one parameter, type, which could
               have the values standard_io, standard_error,
               {file,FileName} or {file,FileName,Modes}.

               This is now changed, so the following parameters are
               allowed:

               type = standard_io | standard_error | file
               file = file:filename()
               modes = [file:mode()]

               All parameters are optional. type defaults to
               standard_io, unless a file name is given, in which case
               it defaults to file. If type is set to file, the file
               name defaults to the same as the handler id.

               The potential incompatibility is that
               logger:get_config/0 and logger:get_handler_config/1 now
               returns the new parameters, even if the configuration
               was set with the old variant, e.g.
               #{type=>{file,FileName}}.


 ---------------------------------------------------------------------
 --- OTP-21.3 --------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-15657    Application(s): erts, otp, tools

               Minor fixes for make clean.


 --- Improvements and New Features ---

  OTP-15460    Application(s): erl_docgen, otp

               *** HIGHLIGHT ***

               The HTML reference documentation shows the OTP version
               where modules and functions were first introduced.
               Versions older than R13B04 are not shown.


 ---------------------------------------------------------------------
 --- common_test-1.17 ------------------------------------------------
 ---------------------------------------------------------------------

 The common_test-1.17 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15540    Application(s): common_test

               A bug caused ct:encrypt_config_file/3 and
               ct:decrypt_config_file/3 to fail with badmatch if input
               parameter KeyOrFile was {key,string()}. This is now
               corrected.


  OTP-15584    Application(s): common_test
               Related Id(s): ERIERL-282

               The status of a test case which failed with timetrap
               timeout in end_per_testcase could not be modified by
               returning {fail,Reason} from a post_end_per_testcase
               hook function. This is now corrected.


 --- Improvements and New Features ---

  OTP-15229    Application(s): common_test
               Related Id(s): ERIERL-203

               A new variant of the newline option to ct_telnet:cmd/3
               and ct_telnet:send/3 is added, which allows to specify
               a string to append as newline indicator on a command.
               By default, the value is "\n", but in some cases it is
               required to be "\r\n", which this option allows.

               A faulty regular expression given as parameter to
               ct_telnet:expect/2,3 would earlier crash and look like
               an internal error in common_test. A better error
               indication is now given, but the test case will still
               fail.


  OTP-15298    Application(s): common_test

               Since the yang RFC allows more than one top element of
               config data in an edit-config element,
               ct_netconfc:edit_config/3,4,5 can now take a list of
               XML elements.


 Full runtime dependencies of common_test-1.17: compiler-6.0,
 crypto-3.6, debugger-4.1, erts-7.0, ftp-1.0.0, inets-6.0, kernel-4.0,
 observer-2.1, runtime_tools-1.8.16, sasl-2.4.2, snmp-5.1.2, ssh-4.0,
 stdlib-3.5, syntax_tools-1.7, tools-2.8, xmerl-1.3.8


 ---------------------------------------------------------------------
 --- compiler-7.3.2 --------------------------------------------------
 ---------------------------------------------------------------------

 The compiler-7.3.2 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15518    Application(s): compiler
               Related Id(s): ERL-829

               An expression such as (A / B) band 16#ff would crash
               the compiler.


  OTP-15552    Application(s): compiler
               Related Id(s): ERL-838

               There could be an incorrect warning when the
               tuple_calls option was given. The generated code would
               be correct. Here is an example of code that would
               trigger the warning:

               (list_to_atom("prefix_" ++
               atom_to_list(suffix))):doit(X).


  OTP-15577    Application(s): compiler, dialyzer
               Related Id(s): ERL-851, PR-1944, PR-2141

               Optimize (again) Dialyzer's handling of
               left-associative use of andalso and orelse in guards.


 Full runtime dependencies of compiler-7.3.2: crypto-3.6, erts-9.0,
 hipe-3.12, kernel-4.0, stdlib-2.5


 ---------------------------------------------------------------------
 --- crypto-4.4.1 ----------------------------------------------------
 ---------------------------------------------------------------------

 The crypto-4.4.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15634    Application(s): crypto

               Fixes a bug that caused crypto:sign and crypto:verify
               to return the error message badarg instead of notsup in
               one case. That case was when signing or verifying with
               eddsa keys (that is, ed15519 or ed448), but only when
               FIPS was supported and enabled.


 --- Improvements and New Features ---

  OTP-15447    Application(s): crypto

               Added a crypto benchmark test suite.


 Full runtime dependencies of crypto-4.4.1: erts-9.0, kernel-5.3,
 stdlib-3.4


 ---------------------------------------------------------------------
 --- dialyzer-3.3.2 --------------------------------------------------
 ---------------------------------------------------------------------

 The dialyzer-3.3.2 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15562    Application(s): dialyzer
               Related Id(s): ERL-845

               Fix a bug that caused Dialyzer to crash when analyzing
               a contract with a module name differing from the
               analyzed module's name. The bug was introduced in
               Erlang/OTP 18.


  OTP-15570    Application(s): dialyzer, hipe

               Fix a bug in the handling of the Key argument of
               lists:{keysearch, keyfind, keymember}.


  OTP-15577    Application(s): compiler, dialyzer
               Related Id(s): ERL-851, PR-1944, PR-2141

               Optimize (again) Dialyzer's handling of
               left-associative use of andalso and orelse in guards.


 Full runtime dependencies of dialyzer-3.3.2: compiler-7.0, erts-9.0,
 hipe-3.16.1, kernel-5.3, stdlib-3.4, syntax_tools-2.0, wx-1.2


 ---------------------------------------------------------------------
 --- diameter-2.2 ----------------------------------------------------
 ---------------------------------------------------------------------

 The diameter-2.2 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15569    Application(s): diameter
               Related Id(s): ERIERL-302

               Fix failure of incoming answer message with faulty
               Experimental-Result-Code. Failure to decode the AVP
               resulted in an uncaught exception, with no no
               handle_answer/error callback as a consequence.


 --- Improvements and New Features ---

  OTP-15398    Application(s): diameter

               Add spawn_opt MFA configuration to allow a callback to
               spawn a handler process for an incoming Diameter
               request on an an arbitrary node. Module diameter_dist
               provides a route_session/2 that can be used to
               distribute requests based on Session-Id, although this
               module is currently only documented in the module
               itself and may change.


 Full runtime dependencies of diameter-2.2: erts-10.0, kernel-3.2,
 ssl-9.0, stdlib-2.4


 ---------------------------------------------------------------------
 --- edoc-0.10 -------------------------------------------------------
 ---------------------------------------------------------------------

 The edoc-0.10 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15605    Application(s): edoc
               Related Id(s): ERL-841

               Print a helpful message explaining that adding
               {preprocess, true} can help if reading a source file
               fails.


 Full runtime dependencies of edoc-0.10: erts-6.0, inets-5.10,
 kernel-3.0, stdlib-2.5, syntax_tools-1.6.14, xmerl-1.3.7


 ---------------------------------------------------------------------
 --- erl_docgen-0.9 --------------------------------------------------
 ---------------------------------------------------------------------

 The erl_docgen-0.9 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15460    Application(s): erl_docgen, otp

               *** HIGHLIGHT ***

               The HTML reference documentation shows the OTP version
               where modules and functions were first introduced.
               Versions older than R13B04 are not shown.


  OTP-15637    Application(s): erl_docgen
               Related Id(s): PR-2160

               Make html documentation of C functions with many
               arguments more readable.


 Full runtime dependencies of erl_docgen-0.9: edoc-0.7.13, erts-9.0,
 stdlib-3.4, xmerl-1.3.7


 ---------------------------------------------------------------------
 --- erl_interface-3.11 ----------------------------------------------
 ---------------------------------------------------------------------

 The erl_interface-3.11 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15442    Application(s): erl_interface
               Related Id(s): ERIERL-258

               *** HIGHLIGHT ***

               Support for plugin of a user supplied socket
               implementation has been added.


 ---------------------------------------------------------------------
 --- erts-10.3 -------------------------------------------------------
 ---------------------------------------------------------------------

 Note! The erts-10.3 application can *not* be applied independently of
       other applications on an arbitrary OTP 21 installation.

       On a full OTP 21 installation, also the following runtime
       dependencies have to be satisfied:
       -- kernel-6.1 (first satisfied in OTP 21.1)
       -- sasl-3.3 (first satisfied in OTP 21.2)


 --- Fixed Bugs and Malfunctions ---

  OTP-15484    Application(s): erts

               When multiplying a number by itself, a word beyond the
               number on the heap could be read (and ignored). This
               bug was extremely unlikely to actually cause a real
               problem.


  OTP-15490    Application(s): erts, kernel

               Fix bug where doing seq_trace:reset_trace() while
               another process was doing a garbage collection could
               cause the run-time system to segfault.


  OTP-15494    Application(s): erts

               Fix reading of ancillary data from packet oriented
               sockets on old Linux kernel versions. Without this fix,
               getting the data would cause the port to enter an
               infinite loop.


  OTP-15527    Application(s): erts

               Fix bug where crash dumping or doing
               erlang:system_info(procs) while another process was
               doing a garbage collection could cause the run-time
               system to segfault.


  OTP-15556    Application(s): erts

               Fix erlang:system_info(kernel_poll) to return correct
               value. Before this fix, the call always returned false.


  OTP-15567    Application(s): erts

               Fix bug in enif_make_map_from_arrays that would produce
               broken maps when number of keys were 32. Bug exists
               since OTP 21.0.


  OTP-15583    Application(s): erts
               Related Id(s): PR-2118

               Fix a bug in binary:encode_unsigned that may cause a
               read of uninitialized memory.

               The bug existed since the function was added (OTP
               R16B02).


  OTP-15599    Application(s): erts
               Related Id(s): ERIERL-298

               Fixed a bug that could cause heart to kill an exiting
               node before it had time to flush all buffered writes.
               If environment variable HEART_KILL_SIGNAL=SIGABRT was
               set a superfluous core dump could also be generated.


  OTP-15604    Application(s): erts

               Fix enif_consume_timeslice to be a no-op on dirty
               scheduler and not crash debug compiled emulator.


  OTP-15629    Application(s): erts

               Fixed macro redefinition warnings.


  OTP-15650    Application(s): erts
               Related Id(s): ERL-854, PR-2161

               to_erl fixed to not garble terminal input beyond 7-bit
               ASCII.


  OTP-15657    Application(s): erts, otp, tools

               Minor fixes for make clean.


  OTP-15660    Application(s): erts
               Related Id(s): ERL-869

               Fixed a bug in all ets:select* and ets:match* functions
               that could in some rare cases lead to very poor
               performance.


 --- Improvements and New Features ---

  OTP-15375    Application(s): erts

               Add erlang:system_flag(system_logger, Pid) and
               erlang:system_info(system_logger). This system_flag can
               be used to set the process that will receive the
               logging messages generated by ERTS.


  OTP-15503    Application(s): erts
               Related Id(s): PR-2052

               integer_to_list/2 and integer_to_binary/2 are now
               implemented in C, improving their performance.


  OTP-15514    Application(s): erts
               Related Id(s): ERL-774

               Improved term_to_binary to do more fair reduction count
               and yielding when encoding large byte lists (strings).


  OTP-15555    Application(s): erts
               Related Id(s): ERIERL-231

               Made internal port drivers more robust against
               erlang:port_control with invalid arguments and added
               documentation warnings about such abuse.


  OTP-15558    Application(s): erts
               Related Id(s): ERL-725

               Fix bug on NetBSD where the exit_status from a port
               program would never be sent.


  OTP-15576    Application(s): erts
               Related Id(s): ERL-843

               There is a new function persistent:term(Key, Default)
               to allow specifying a default when looking up a
               persistent term.


  OTP-15580    Application(s): erts
               Related Id(s): PR-2113

               A transitory emulator option '+ztma true' has been
               added to allow running existing BEAM code that relies
               on "tuple calls" (dispatch on parameterized modules)
               which has been compiled under OTP 20 or earlier. This
               option will be removed in OTP 22, so such modules
               should eventually be recompiled with the +tuple_calls
               option.


 Full runtime dependencies of erts-10.3: kernel-6.1, sasl-3.3,
 stdlib-3.5


 ---------------------------------------------------------------------
 --- ftp-1.0.2 -------------------------------------------------------
 ---------------------------------------------------------------------

 The ftp-1.0.2 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15659    Application(s): ftp
               Related Id(s): ERIERL-316

               Fixed timing related bug that could make ftp functions
               behave badly.


 Full runtime dependencies of ftp-1.0.2: erts-7.0, kernel-6.0,
 stdlib-3.5


 ---------------------------------------------------------------------
 --- hipe-3.18.3 -----------------------------------------------------
 ---------------------------------------------------------------------

 The hipe-3.18.3 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15570    Application(s): dialyzer, hipe

               Fix a bug in the handling of the Key argument of
               lists:{keysearch, keyfind, keymember}.


 Full runtime dependencies of hipe-3.18.3: compiler-5.0, erts-9.3,
 kernel-5.3, stdlib-3.4, syntax_tools-1.6.14


 ---------------------------------------------------------------------
 --- inets-7.0.6 -----------------------------------------------------
 ---------------------------------------------------------------------

 The inets-7.0.6 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15669    Application(s): inets
               Related Id(s): ERIERL-321

               Fix the internal handling of the option
               erl_script_timeout in httpd. When httpd was started
               with explicit erl_script_timeout, the value of the
               option was converted to milliseconds before storage.
               Subsequent calls to httpd:info/1 returned the input
               value multiplied by 1000.

               This change fixes the handing of erl_script_timeout by
               storing the timeout in seconds and converting to
               milliseconds before usage.


 --- Improvements and New Features ---

  OTP-15508    Application(s): inets
               Related Id(s): ERL-816

               Enhance documentation


 Full runtime dependencies of inets-7.0.6: erts-6.0, kernel-3.0,
 mnesia-4.12, runtime_tools-1.8.14, ssl-5.3.4, stdlib-3.5


 ---------------------------------------------------------------------
 --- kernel-6.3 ------------------------------------------------------
 ---------------------------------------------------------------------

 Note! The kernel-6.3 application can *not* be applied independently
       of other applications on an arbitrary OTP 21 installation.

       On a full OTP 21 installation, also the following runtime
       dependency has to be satisfied:
       -- erts-10.2.5 (first satisfied in OTP 21.2.7)


 --- Fixed Bugs and Malfunctions ---

  OTP-14702    Application(s): kernel
               Related Id(s): PR-2066

               If for example the /etc/hosts did not come into
               existence until after the kernel application had
               started, its content was never read. This bug has now
               been corrected.


  OTP-15490    Application(s): erts, kernel

               Fix bug where doing seq_trace:reset_trace() while
               another process was doing a garbage collection could
               cause the run-time system to segfault.


  OTP-15557    Application(s): kernel
               Related Id(s): PR-2117

               Fix erl_epmd:port_please spec to include atom() and
               string().


  OTP-15578    Application(s): kernel
               Related Id(s): ERL-850

               The Logger handler logger_std_h now keeps track of the
               inode of its log file in order to re-open the file if
               the inode changes. This may happen, for instance, if
               the log file is opened and saved by an editor.


  OTP-15602    Application(s): kernel

               When user specific file modes are given to the logger
               handler logger_std_h, they were earlier accepted
               without any control. This is now changes, so Logger
               will adjust the file modes as follows:

               - If raw is not found in the list, it is added.
               - If none of write, append or exclusive are found in
               the list, append is added.
               - If none of delayed_write or
               {delayed_write,Size,Delay} are found in the list,
               delayed_write is added.


 --- Improvements and New Features ---

  OTP-15479    Application(s): kernel

               The standard logger handler, logger_std_h, now has a
               new internal feature for log rotation. The rotation
               scheme is as follows:

               The log file to which the handler currently writes
               always has the same name, i.e. the name which is
               configured for the handler. The archived files have the
               same name, but with extension ".N", where N is an
               integer. The newest archive has extension ".0", and the
               oldest archive has the highest number.

               The size at which the log file is rotated, and the
               number of archive files that are kept, is specified
               with the handler specific configuration parameters
               max_no_bytes and max_no_files respectively.

               Archives can be compressed, in which case they get a
               ".gz" file extension after the integer. Compression is
               specified with the handler specific configuration
               parameter compress_on_rotate.


  OTP-15600    Application(s): kernel

               The new functions logger:i/0 and logger:i/1 are added.
               These provide the same information as
               logger:get_config/0 and other logger:get_*_config
               functions, but the information is more logically sorted
               and more readable.


  OTP-15601    Application(s): kernel

               Logger is now protected against overload due to massive
               amounts of log events from the emulator or from remote
               nodes.


  OTP-15625    Application(s): kernel

               Logger now uses os:system_time/1 instead of
               erlang:system_time/1 to generate log event timestamps.


  OTP-15642    Application(s): kernel
               Related Id(s): PR-2164

               Add functions application:set_env/1,2 and
               application:set_env/2. These take a list of application
               configuration parameters, and the behaviour is
               equivalent to calling application:set_env/4
               individually for each application/key combination,
               except it is more efficient.

               set_env/1,2 warns about duplicated applications or
               keys. The warning is also emitted during boot, if
               applications or keys are duplicated within one
               configuration file, e.g. sys.config.


  OTP-15662    Application(s): kernel

               *** POTENTIAL INCOMPATIBILITY ***

               Handler specific configuration parameters for the
               standard handler logger_std_h are changed to be more
               intuitive and more similar to the disk_log handler.

               Earlier there was only one parameter, type, which could
               have the values standard_io, standard_error,
               {file,FileName} or {file,FileName,Modes}.

               This is now changed, so the following parameters are
               allowed:

               type = standard_io | standard_error | file
               file = file:filename()
               modes = [file:mode()]

               All parameters are optional. type defaults to
               standard_io, unless a file name is given, in which case
               it defaults to file. If type is set to file, the file
               name defaults to the same as the handler id.

               The potential incompatibility is that
               logger:get_config/0 and logger:get_handler_config/1 now
               returns the new parameters, even if the configuration
               was set with the old variant, e.g.
               #{type=>{file,FileName}}.


  OTP-15663    Application(s): kernel

               The new configuration parameter file_check is added to
               the Logger handler logger_std_h. This parameter
               specifies how long (in milliseconds) the handler may
               wait before checking if the log file still exists and
               the inode is the same as when it was opened.

               The default value is 0, which means that this check is
               done prior to each write operation. Setting a higher
               number may improve performance, but adds the risk of
               loosing log events.


 Full runtime dependencies of kernel-6.3: erts-10.2.5, sasl-3.0,
 stdlib-3.5


 ---------------------------------------------------------------------
 --- mnesia-4.15.6 ---------------------------------------------------
 ---------------------------------------------------------------------

 The mnesia-4.15.6 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15619    Application(s): mnesia
               Related Id(s): ERIERL-310

               Avoid overload warnings caused by a race condition.


 Full runtime dependencies of mnesia-4.15.6: erts-9.0, kernel-5.3,
 stdlib-3.4


 ---------------------------------------------------------------------
 --- observer-2.9 ----------------------------------------------------
 ---------------------------------------------------------------------

 The observer-2.9 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15553    Application(s): observer
               Related Id(s): ERL-848

               Since Logger was introduced in OTP-21.0, menu choice
               *Log > Toggle Log View* in observer would cause a crash
               unless an error_logger event handler was explicitly
               installed. This is now corrected.


 --- Improvements and New Features ---

  OTP-15493    Application(s): observer
               Related Id(s): ERL-810

               Since persistent_term was introduced, observer would
               sometimes crash when expanding a term from a process
               state. This is now corrected.


  OTP-15586    Application(s): observer
               Related Id(s): PR-2105

               Add OBSERVER_SCALE environment variable for HiDPI
               support.


 Full runtime dependencies of observer-2.9: erts-7.0, et-1.5,
 kernel-3.0, runtime_tools-1.8.14, stdlib-3.5, wx-1.2


 ---------------------------------------------------------------------
 --- odbc-2.12.3 -----------------------------------------------------
 ---------------------------------------------------------------------

 The odbc-2.12.3 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15667    Application(s): odbc
               Related Id(s): ERL-808, PR-2065

               Enhance error handling to avoid stack corruption


 Full runtime dependencies of odbc-2.12.3: erts-6.0, kernel-3.0,
 stdlib-2.0


 ---------------------------------------------------------------------
 --- public_key-1.6.5 ------------------------------------------------
 ---------------------------------------------------------------------

 The public_key-1.6.5 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15624    Application(s): public_key

               Add export of dialyzer type


 Full runtime dependencies of public_key-1.6.5: asn1-3.0, crypto-3.8,
 erts-6.0, kernel-3.0, stdlib-3.5


 ---------------------------------------------------------------------
 --- runtime_tools-1.13.2 --------------------------------------------
 ---------------------------------------------------------------------

 The runtime_tools-1.13.2 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15670    Application(s): runtime_tools

               Update of systemtap trace example scripts.


 Full runtime dependencies of runtime_tools-1.13.2: erts-8.0,
 kernel-5.0, mnesia-4.12, stdlib-3.0


 ---------------------------------------------------------------------
 --- ssh-4.7.4 -------------------------------------------------------
 ---------------------------------------------------------------------

 The ssh-4.7.4 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15498    Application(s): ssh
               Related Id(s): ERL-822, PR-2077

               SSH sftp daemon now accepts an SSH_FXP_STAT message
               encoded according to the wrong sftp version. Some
               clients sends such messages.


 Full runtime dependencies of ssh-4.7.4: crypto-4.2, erts-6.0,
 kernel-3.0, public_key-1.5.2, stdlib-3.3


 ---------------------------------------------------------------------
 --- ssl-9.2 ---------------------------------------------------------
 ---------------------------------------------------------------------

 The ssl-9.2 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15502    Application(s): ssl

               Fix bug that an incorrect return value for gen_statem
               could be created when alert was a result of handling
               renegotiation info extension


  OTP-15539    Application(s): ssl

               Correct check for 3des_ede_cbc, could cause ssl to
               claim to support 3des_ede_cbc when cryptolib does not.


  OTP-15561    Application(s): ssl

               Improved DTLS error handling, avoids unexpected
               connection failure in rare cases.


  OTP-15666    Application(s): ssl
               Related Id(s): ERIERL-316

               Corrected active once emulation bug that could cause
               the ssl_closed meassage to not be sent. Bug introduced
               by OTP-15449


 --- Improvements and New Features ---

  OTP-15369    Application(s): ssl

               Add client option {reuse_session, SessionID::binary()}
               that can be used together with new option value
               {reuse_sessions, save}. This makes it possible to reuse
               a session from a specific connection establishment.


  OTP-15423    Application(s): ssl

               *** HIGHLIGHT ***

               *** POTENTIAL INCOMPATIBILITY ***

               The Reason part of of the error return from the
               functions connect and handshake has a better and
               documented format. This will sometimes differ from
               previous returned reasons, however those where only
               documented as term() and should for that reason not be
               relied on.


  OTP-15445    Application(s): ssl

               *** HIGHLIGHT ***

               Refactor of state handling to improve TLS application
               data throughput and reduce CPU overhead


  OTP-15529    Application(s): ssl

               *** HIGHLIGHT ***

               The SSL code has been optimized in many small ways to
               reduce CPU load for encryption/decryption, especially
               for Erlang's distribution protocol over TLS.


  OTP-15665    Application(s): ssl
               Related Id(s): ERL-811, PR-2072

               *** HIGHLIGHT ***

               Add support for active N


 Full runtime dependencies of ssl-9.2: crypto-4.2, erts-10.0,
 inets-5.10.7, kernel-6.0, public_key-1.5, stdlib-3.5


 ---------------------------------------------------------------------
 --- stdlib-3.8 ------------------------------------------------------
 ---------------------------------------------------------------------

 The stdlib-3.8 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15592    Application(s): stdlib
               Related Id(s): ERL-818

               Fix a bug in the Erlang Pretty Printer: long atom names
               in combination with > could cause a crash.


  OTP-15639    Application(s): stdlib

               Fix bugs that could cause wrong results or bad
               performance when formatting lists of characters using
               the control sequences p or P and limiting the output
               with the option chars_limit.


 --- Improvements and New Features ---

  OTP-15545    Application(s): stdlib
               Related Id(s): PR-2103, PR-2139

               Improved ETS documentation about safe table traversal
               and the partially bound key optimization for
               ordered_set.


  OTP-15572    Application(s): stdlib
               Related Id(s): PR-2121

               Optimize calendar:gregorian_days_to_date/1.


  OTP-15630    Application(s): stdlib

               Optimize functions calendar:rfc3339_to_system_time()
               and calendar:system_time_to_rfc3339().


 Full runtime dependencies of stdlib-3.8: compiler-5.0, crypto-3.3,
 erts-10.0, kernel-6.0, sasl-3.0


 ---------------------------------------------------------------------
 --- syntax_tools-2.1.7 ----------------------------------------------
 ---------------------------------------------------------------------

 The syntax_tools-2.1.7 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15519    Application(s): syntax_tools
               Related Id(s): ERL-815

               Fix pretty-printing of type funs.


 Full runtime dependencies of syntax_tools-2.1.7: compiler-7.0,
 erts-9.0, kernel-5.0, stdlib-3.4


 ---------------------------------------------------------------------
 --- tools-3.1 -------------------------------------------------------
 ---------------------------------------------------------------------

 The tools-3.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15657    Application(s): erts, otp, tools

               Minor fixes for make clean.


 --- Improvements and New Features ---

  OTP-15541    Application(s): tools

               In the HTML file generated by
               cover:analyse_to_file/1,2, a link is now added to the
               line number. This makes it easier to share pointers to
               specific lines.


  OTP-15542    Application(s): tools

               Uncovered lines are now marked with a sad face, :-(, in
               the HTML output from cover:analyse_to_file/1,2. This is
               to make these lines easier to find by search.


 Full runtime dependencies of tools-3.1: compiler-5.0, erts-9.1,
 kernel-5.4, runtime_tools-1.8.14, stdlib-3.4


 ---------------------------------------------------------------------
 --- wx-1.8.7 --------------------------------------------------------
 ---------------------------------------------------------------------

 The wx-1.8.7 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15587    Application(s): wx

               Improved support for wxWidgets 3.1.3 which have changed
               wxFONTWEIGTH, also added wxGCDC and wxDisplay modules.

               Fixed a crash on Mojave and check for events more
               often.


 Full runtime dependencies of wx-1.8.7: erts-6.0, kernel-3.0,
 stdlib-2.0


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