path: root/release-notes/OTP-21.1.README.txt

Patch Package:           OTP 21.1
Git Tag:                 OTP-21.1
Date:                    2018-09-25
Trouble Report Id:       OTP-12983, OTP-14406, OTP-14440, OTP-14717,
                         OTP-15020, OTP-15038, OTP-15060, OTP-15122,
                         OTP-15132, OTP-15133, OTP-15134, OTP-15143,
                         OTP-15145, OTP-15146, OTP-15153, OTP-15161,
                         OTP-15162, OTP-15163, OTP-15164, OTP-15165,
                         OTP-15168, OTP-15170, OTP-15171, OTP-15172,
                         OTP-15173, OTP-15174, OTP-15180, OTP-15181,
                         OTP-15182, OTP-15186, OTP-15188, OTP-15190,
                         OTP-15191, OTP-15192, OTP-15193, OTP-15198,
                         OTP-15201, OTP-15205, OTP-15206, OTP-15207,
                         OTP-15208, OTP-15209, OTP-15210, OTP-15212,
                         OTP-15213, OTP-15216, OTP-15217, OTP-15218,
                         OTP-15219, OTP-15221, OTP-15224, OTP-15226,
                         OTP-15227, OTP-15228, OTP-15230, OTP-15231,
                         OTP-15234, OTP-15235, OTP-15236, OTP-15239,
                         OTP-15240, OTP-15241, OTP-15242, OTP-15243,
                         OTP-15252, OTP-15253, OTP-15260, OTP-15268,
                         OTP-15276, OTP-15277, OTP-15278, OTP-15281,
                         OTP-15282, OTP-15283, OTP-15284, OTP-15285,
                         OTP-15286, OTP-15287, OTP-15290, OTP-15291,
                         OTP-15294, OTP-15297, OTP-15303, OTP-15304,
                         OTP-15307
Seq num:                 ERIERL-187, ERIERL-191, ERIERL-206,
                         ERIERL-213, ERIERL-217, ERIERL-220,
                         ERIERL-221, ERL-55, ERL-602, ERL-643,
                         ERL-648, ERL-658, ERL-665, ERL-667, ERL-675,
                         ERL-677, ERL-680, ERL-684, ERL-689, ERL-692,
                         ERL-699, ERL-703, ERL-719
System:                  OTP
Release:                 21
Application:             asn1-5.0.7, common_test-1.16.1,
                         compiler-7.2.5, crypto-4.3.3, debugger-4.2.6,
                         dialyzer-3.3.1, diameter-2.1.6, edoc-0.9.4,
                         eldap-1.2.5, erl_docgen-0.8.1,
                         erl_interface-3.10.4, erts-10.1, et-1.6.3,
                         eunit-2.3.7, ftp-1.0.1, hipe-3.18.1,
                         inets-7.0.2, jinterface-1.9.1, kernel-6.1,
                         megaco-3.18.4, mnesia-4.15.5, observer-2.8.1,
                         odbc-2.12.2, os_mon-2.4.6, otp_mibs-1.2.1,
                         parsetools-2.1.8, public_key-1.6.2,
                         reltool-0.7.7, runtime_tools-1.13.1,
                         sasl-3.2.1, snmp-5.2.12, ssh-4.7.1,
                         ssl-9.0.2, stdlib-3.6, syntax_tools-2.1.6,
                         tftp-1.0.1, tools-3.0.1, wx-1.8.5,
                         xmerl-1.3.18
Predecessor:             OTP 21.0.9

 Check out the git tag OTP-21.1, 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-15133    Application(s): ssh
               Related Id(s): OTP-15240

               The key exchange methods
               '[email protected]', 'curve25519-sha256' and
               'curve448-sha512' are implemented. The last two are
               defined in
               https://tools.ietf.org/html/draft-ietf-curdle-ssh-curves

               They all depends on that OpenSSL 1.1.1 or higher is
               used as cryptolib.


  OTP-15134    Application(s): crypto, public_key

               The typing in the CRYPTO and PUBLIC_KEY applications
               are reworked and a few mistakes are corrected.

               The documentation is now generated from the typing and
               some clarifications are made.

               A new chapter on Algorithm Details such as key sizes
               and availability is added to the CRYPTO User's Guide.


  OTP-15145    Application(s): erts, kernel
               Related Id(s): ERIERL-187

               The socket options recvtos, recvttl, recvtclass and
               pktoptions have been implemented in the socket modules.
               See the documentation for the gen_tcp, gen_udp and inet
               modules. Note that support for these in the runtime
               system is platform dependent. Especially for pktoptions
               which is very Linux specific and obsoleted by the RFCs
               that defined it.


  OTP-15209    Application(s): ssh
               Related Id(s): OTP-15164

               The cipher '[email protected]' is now
               supported if OpenSSL 1.1.1 or higher is used as
               cryptolib.


 ---------------------------------------------------------------------
 --- asn1-5.0.7 ------------------------------------------------------
 ---------------------------------------------------------------------

 The asn1-5.0.7 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-14440    Application(s): asn1
               Related Id(s): ERIERL-220

               A bug in ASN.1 BER decoding has been fixed. When
               decoding a recursively enclosed term the length was not
               propagated to that term decoding, so if the length of
               the enclosed term was longer than the enclosing that
               error was not detected.

               A hard coded C stack limitation for decoding recursive
               ASN.1 terms has been introduced. This is currently set
               to 8 kWords giving a nesting depth of about 1000
               levels. Deeper terms can not be decoded, which should
               not be much of a real world limitation.


 Full runtime dependencies of asn1-5.0.7: erts-7.0, kernel-3.0,
 stdlib-2.0


 ---------------------------------------------------------------------
 --- common_test-1.16.1 ----------------------------------------------
 ---------------------------------------------------------------------

 The common_test-1.16.1 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15307    Application(s): common_test

               The Logger handler cth_log_redirect earlier called the
               report callback (report_cb) before calling the logger
               formatter. In some cases this would fail, since
               cth_log_redirect could not handle report callbacks with
               two arguments. This is now corrected, so only the
               formatter will call the report callback.


 Full runtime dependencies of common_test-1.16.1: 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-7.2.5 --------------------------------------------------
 ---------------------------------------------------------------------

 The compiler-7.2.5 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15186    Application(s): compiler
               Related Id(s): ERL-665

               Fixed a bug that prevented certain variable-sized
               binary comprehensions from compiling.


  OTP-15188    Application(s): compiler
               Related Id(s): ERL-658

               When compiling from Core Erlang, funs created in
               certain expressions that were only used for their
               side-effects were subtly broken.


  OTP-15218    Application(s): compiler
               Related Id(s): ERL-684

               There could be an internal consistency failure when a
               receive was nested in a try/catch.


  OTP-15219    Application(s): compiler
               Related Id(s): ERL-689

               In rare circumstances, the matched out tail of a binary
               could be the entire original binary.


  OTP-15227    Application(s): compiler
               Related Id(s): ERL-699

               When is_map_key/2 was used in a guard together with the
               not/1 or or/2 operators, the error behavior could be
               wrong when is_map_key/2 was passed a non-map as the
               second argument.

               In rare circumstances, compiling code that uses
               is_map_key/2 could cause an internal consistency check
               failure.


  OTP-15235    Application(s): compiler
               Related Id(s): ERL-703

               The compiler could crash when compiling a function with
               multiple receives in multiple clauses.


 Full runtime dependencies of compiler-7.2.5: crypto-3.6, erts-9.0,
 hipe-3.12, kernel-4.0, stdlib-2.5


 ---------------------------------------------------------------------
 --- crypto-4.3.3 ----------------------------------------------------
 ---------------------------------------------------------------------

 The crypto-4.3.3 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15212    Application(s): crypto
               Related Id(s): ERL-675, PR1899, PR838

               The RSA options rsa_mgf1_md, rsa_oaep_md, and
               rsa_oaep_label were always disabled. They will now be
               enabled when a suitable cryptolib is used.

               They are still experimental and may change without
               prior notice.


  OTP-15283    Application(s): crypto

               The ciphers aes_ige256 and blowfish_cbc had naming
               issues in crypto:next_iv/2.


  OTP-15303    Application(s): crypto

               the RSA_SSLV23_PADDING is disabled if LibreSSL is used
               as cryptlib. This is due to compilation problems.

               This will be investigated further in the future.


 --- Improvements and New Features ---

  OTP-14717    Application(s): crypto
               Related Id(s): OTP-15244

               The supported named elliptic curves are now reported in
               crypto:supports/0 in a new entry tagged by 'curves'.

               The function crypto:ec_curves/0 is kept for
               compatibility.


  OTP-15134    Application(s): crypto, public_key

               *** HIGHLIGHT ***

               The typing in the CRYPTO and PUBLIC_KEY applications
               are reworked and a few mistakes are corrected.

               The documentation is now generated from the typing and
               some clarifications are made.

               A new chapter on Algorithm Details such as key sizes
               and availability is added to the CRYPTO User's Guide.


  OTP-15153    Application(s): crypto

               Support for SHA3 both as a separate hash and in HMAC is
               now available if OpenSSL 1.1.1 or higher is used as
               cryptolib.

               Available lengths are reported in the 'hashs' entry in
               crypto:supports/0 as sha3_*.


  OTP-15164    Application(s): crypto
               Related Id(s): OTP-15209

               The mac algorithm poly1305 and the cipher algorithm
               chacha20 are now supported if OpenSSL 1.1.1 or higher
               is used as cryptolib.


  OTP-15240    Application(s): crypto
               Related Id(s): OTP-15133

               The key exchange Edward curves x25519 and x448 are now
               supported if OpenSSL 1.1.1 or higher is used as
               cryptolib.


  OTP-15260    Application(s): crypto

               The supported RSA options for sign/verify and
               encrypt/decrypt are now reported in crypto:supports/0
               in a new entry tagged by 'rsa_opts'.

               The exakt set is still experimental and may change
               without prior notice.


  OTP-15286    Application(s): crypto

               The cipher aes_ccm is added.


 Full runtime dependencies of crypto-4.3.3: erts-9.0, kernel-5.3,
 stdlib-3.4


 ---------------------------------------------------------------------
 --- debugger-4.2.6 --------------------------------------------------
 ---------------------------------------------------------------------

 The debugger-4.2.6 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of debugger-4.2.6: compiler-5.0, erts-9.0,
 kernel-5.3, stdlib-3.4, wx-1.2


 ---------------------------------------------------------------------
 --- dialyzer-3.3.1 --------------------------------------------------
 ---------------------------------------------------------------------

 The dialyzer-3.3.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15268    Application(s): dialyzer
               Related Id(s): ERL-680

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


 Full runtime dependencies of dialyzer-3.3.1: compiler-7.0, erts-9.0,
 hipe-3.16.1, kernel-5.3, stdlib-3.4, syntax_tools-2.0, wx-1.2


 ---------------------------------------------------------------------
 --- diameter-2.1.6 --------------------------------------------------
 ---------------------------------------------------------------------

 The diameter-2.1.6 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15198    Application(s): diameter
               Related Id(s): ERIERL-213

               Fix function_clause when sending an outgoing request
               after DPA has been sent in response to an incoming DPR.
               The caused the diameter_peer_fsm gen_server associated
               with the peer connection to fail, which could then
               result in the transport connection being reset before
               the peer closed it upon reception of DPA.


 Full runtime dependencies of diameter-2.1.6: erts-10.0, kernel-3.2,
 ssl-9.0, stdlib-2.4


 ---------------------------------------------------------------------
 --- edoc-0.9.4 ------------------------------------------------------
 ---------------------------------------------------------------------

 The edoc-0.9.4 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of edoc-0.9.4: erts-6.0, inets-5.10,
 kernel-3.0, stdlib-2.5, syntax_tools-1.6.14, xmerl-1.3.7


 ---------------------------------------------------------------------
 --- eldap-1.2.5 -----------------------------------------------------
 ---------------------------------------------------------------------

 The eldap-1.2.5 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of eldap-1.2.5: asn1-3.0, erts-6.0,
 kernel-3.0, ssl-5.3.4, stdlib-2.0


 ---------------------------------------------------------------------
 --- erl_docgen-0.8.1 ------------------------------------------------
 ---------------------------------------------------------------------

 The erl_docgen-0.8.1 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-14406    Application(s): erl_docgen

               Indexing for the online search function has been
               corrected for CREF documents.


 Full runtime dependencies of erl_docgen-0.8.1: edoc-0.7.13, erts-9.0,
 stdlib-3.4, xmerl-1.3.7


 ---------------------------------------------------------------------
 --- erl_interface-3.10.4 --------------------------------------------
 ---------------------------------------------------------------------

 The erl_interface-3.10.4 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15161    Application(s): erl_interface
               Related Id(s): ERIERL-191

               Make ei_connect and friends also accept state
               ok_simultaneous during handshake, which means the other
               node has initiated a connection setup that will be
               cancelled in favor of this connection.


  OTP-15171    Application(s): erl_interface

               Fixed bug in ei_receive_msg, ei_xreceive_msg,
               ei_receive_msg_tmo and ei_xreceive_msg_tmo. The
               x->index was set to entire buffer size instead of the
               number of bytes actually received.


  OTP-15191    Application(s): erl_interface

               Fixed bug in ei_connect_init which could be provoked if
               called by concurrent threads. ei_connect_init called
               posix interface gethostbyname which is documented as
               not thread safe.


  OTP-15277    Application(s): erl_interface
               Related Id(s): PR-1929

               Fixed bug in erl_compare_ext() ignoring the tail of
               lists of otherwise equal content. Example: [a | b] and
               [a | c] compared equal and {[a], b} and {[a], c}
               compared equal.


 ---------------------------------------------------------------------
 --- erts-10.1 -------------------------------------------------------
 ---------------------------------------------------------------------

 Note! The erts-10.1 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:
       -- kernel-6.1 (first satisfied in OTP 21.1)


 --- Fixed Bugs and Malfunctions ---

  OTP-15038    Application(s): erts
               Related Id(s): ERL-602

               Fix the seq_trace token to not be cleared when a
               process receives messages sent by erts. Some examples
               of when this could happen is all port BIFs, i.e.
               open_port, port_command etc etc.

               Fix so that messages sent by nifs can be traced using
               normal and seq_trace tracing.


  OTP-15180    Application(s): erts
               Related Id(s): ERL-648

               Fixed specs and documentation for process_info item
               monitored_by to include port identifiers and nif
               resources as possible types.


  OTP-15181    Application(s): erts

               Fix bug in generation of erl_crash.dump, which could
               cause VM to crash.

               Bug exist since erts-9.2 (OTP-20.2).


  OTP-15205    Application(s): erts

               Fix bug where ctrl-break or ctrl-c would not trigger
               the break mode properly on Windows. This bug was
               introduced in erts-10.0 (OTP-21).


  OTP-15206    Application(s): erts

               Fix a performance bug for reception of UDP packages,
               where a memory buffer would be reallocated when it
               should not have been.

               Introduce a limit on the maximum automatic increase of
               the UDP user-space buffer to the theoretical max of the
               network PATH, i.e. 65535.


  OTP-15208    Application(s): erts
               Related Id(s): ERL-677, PR-1897

               Fix alignment of erts allocator state internally in
               erts. With the improper alignment the emulator would
               refuse to start when compiled with clang on 32-bit
               systems.


  OTP-15210    Application(s): erts

               Fix bug where too many concurrent calls to
               erlang:open_port({spawn,"cmd"},...) would result in the
               emulator terminating with the reason "Failed to write
               to erl_child_setup: ". After this fix the open_port
               call will throw an emfile exception instead.


  OTP-15217    Application(s): erts

               Upgraded the ERTS internal PCRE library from version
               8.41 to version 8.42. See
               http://pcre.org/original/changelog.txt for information
               about changes made to PCRE. This library implements
               major parts of the re regular expressions module.


  OTP-15236    Application(s): erts
               Related Id(s): ERL-692

               Fix open_port({fd,X,Y}, ...) to release the file
               descriptors from the pollset when closing the port.
               Without this fix the same file descriptor number could
               not be reused when doing multiple open_port and
               port_close sequences.


  OTP-15276    Application(s): erts
               Related Id(s): PR-1920

               Fixed bug in float_to_list/2 and float_to_binary/2 with
               options [{decimals,0},compact] causing totally wrong
               results. Bug exists since OTP-21.0.


  OTP-15278    Application(s): erts

               Fixed bug in erlang:memory causing ets to report too
               much. This small false memory leak (16 bytes each time)
               can only happen when a specific race condition occurs
               between scheduler threads on a table with option
               write_concurrency.


  OTP-15282    Application(s): erts

               Minor configure test fixes


  OTP-15297    Application(s): erts, kernel
               Related Id(s): OTP-15279, OTP-15280

               Improved robustness of distribution connection setup.
               In OTP-21.0 a truly asynchronous connection setup was
               introduced. This is further improvement on that work to
               make the emulator more robust and also be able to
               recover in cases when involved Erlang processes
               misbehave.


 --- Improvements and New Features ---

  OTP-15145    Application(s): erts, kernel
               Related Id(s): ERIERL-187

               *** HIGHLIGHT ***

               The socket options recvtos, recvttl, recvtclass and
               pktoptions have been implemented in the socket modules.
               See the documentation for the gen_tcp, gen_udp and inet
               modules. Note that support for these in the runtime
               system is platform dependent. Especially for pktoptions
               which is very Linux specific and obsoleted by the RFCs
               that defined it.


 Full runtime dependencies of erts-10.1: kernel-6.1, sasl-3.0.1,
 stdlib-3.5


 ---------------------------------------------------------------------
 --- et-1.6.3 --------------------------------------------------------
 ---------------------------------------------------------------------

 The et-1.6.3 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of et-1.6.3: erts-9.0, kernel-5.3,
 runtime_tools-1.10, stdlib-3.4, wx-1.2


 ---------------------------------------------------------------------
 --- eunit-2.3.7 -----------------------------------------------------
 ---------------------------------------------------------------------

 The eunit-2.3.7 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of eunit-2.3.7: erts-9.0, kernel-5.3,
 stdlib-3.4


 ---------------------------------------------------------------------
 --- ftp-1.0.1 -------------------------------------------------------
 ---------------------------------------------------------------------

 The ftp-1.0.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of ftp-1.0.1: erts-7.0, kernel-6.0,
 stdlib-3.5


 ---------------------------------------------------------------------
 --- hipe-3.18.1 -----------------------------------------------------
 ---------------------------------------------------------------------

 The hipe-3.18.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of hipe-3.18.1: compiler-5.0, erts-9.3,
 kernel-5.3, stdlib-3.4, syntax_tools-1.6.14


 ---------------------------------------------------------------------
 --- inets-7.0.2 -----------------------------------------------------
 ---------------------------------------------------------------------

 The inets-7.0.2 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15192    Application(s): inets

               Enhance error handling, that is mod_get will return 403
               if a path is a directory and not a file.


  OTP-15241    Application(s): inets

               Do not use chunked-encoding with 1xx, 204 and 304
               responses when using mod_esi. Old behavior was not
               compliant with HTTP/1.1 RFC and could cause clients to
               hang when they received 1xx, 204 or 304 responses that
               included an empty chunked-encoded body.


  OTP-15242    Application(s): inets

               Add robust handling of chunked-encoded HTTP responses
               with an empty body (1xx, 204, 304). Old behavior could
               cause the client to hang when connecting to a faulty
               server implementation.


 Full runtime dependencies of inets-7.0.2: erts-6.0, kernel-3.0,
 mnesia-4.12, runtime_tools-1.8.14, ssl-5.3.4, stdlib-3.5


 ---------------------------------------------------------------------
 --- jinterface-1.9.1 ------------------------------------------------
 ---------------------------------------------------------------------

 The jinterface-1.9.1 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 ---------------------------------------------------------------------
 --- kernel-6.1 ------------------------------------------------------
 ---------------------------------------------------------------------

 Note! The kernel-6.1 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-10.1 (first satisfied in OTP 21.1)


 --- Fixed Bugs and Malfunctions ---

  OTP-15143    Application(s): kernel

               The values all and none are documented as valid value
               for the Kernel configuration parameter logger_level,
               but would cause a crash during node start. This is now
               corrected.


  OTP-15162    Application(s): kernel
               Related Id(s): ERIERL-191

               Fix some potential buggy behavior in how ticks are sent
               on inter node distribution connections. Tick is now
               sent to c-node even if there are unsent buffered data,
               as c-nodes need ticks in order to send reply ticks. The
               amount of sent data was also calculated wrongly when
               ticks were suppressed due to unsent buffered data.


  OTP-15170    Application(s): kernel

               Non semantic change in dist_util.erl to silence
               dialyzer warning.


  OTP-15182    Application(s): kernel
               Related Id(s): ERL-643

               Fixed net_kernel:connect_node(node()) to return true
               (and do nothing) as it always has before OTP-21.0. Also
               documented this successful "self connect" as the
               expected behavior.


  OTP-15228    Application(s): kernel

               The single_line option on logger_formatter would in
               some cases add an unwanted comma after the association
               arrows in a map. This is now corrected.


  OTP-15297    Application(s): erts, kernel
               Related Id(s): OTP-15279, OTP-15280

               Improved robustness of distribution connection setup.
               In OTP-21.0 a truly asynchronous connection setup was
               introduced. This is further improvement on that work to
               make the emulator more robust and also be able to
               recover in cases when involved Erlang processes
               misbehave.


 --- Improvements and New Features ---

  OTP-15132    Application(s): kernel

               A new macro, ?LOG(Level,...), is added. This is
               equivalent to the existing ?LOG_<LEVEL>(...) macros.

               A new variant of Logger report callback is added, which
               takes an extra argument containing options for size
               limiting and line breaks. Module proc_lib in STDLIB
               uses this for crash reports.

               Logger configuration is now checked a bit more for
               errors.


  OTP-15145    Application(s): erts, kernel
               Related Id(s): ERIERL-187

               *** HIGHLIGHT ***

               The socket options recvtos, recvttl, recvtclass and
               pktoptions have been implemented in the socket modules.
               See the documentation for the gen_tcp, gen_udp and inet
               modules. Note that support for these in the runtime
               system is platform dependent. Especially for pktoptions
               which is very Linux specific and obsoleted by the RFCs
               that defined it.


  OTP-15146    Application(s): kernel

               Add logger:set_application_level/2 for setting the
               logger level of all modules in one application.


 Full runtime dependencies of kernel-6.1: erts-10.1, sasl-3.0,
 stdlib-3.5


 ---------------------------------------------------------------------
 --- megaco-3.18.4 ---------------------------------------------------
 ---------------------------------------------------------------------

 The megaco-3.18.4 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of megaco-3.18.4: asn1-3.0, debugger-4.0,
 erts-7.0, et-1.5, kernel-3.0, runtime_tools-1.8.14, stdlib-2.5


 ---------------------------------------------------------------------
 --- mnesia-4.15.5 ---------------------------------------------------
 ---------------------------------------------------------------------

 The mnesia-4.15.5 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15201    Application(s): mnesia
               Related Id(s): PR-1881

               Fixed type spec for mnesia:change_config/2.


  OTP-15221    Application(s): mnesia
               Related Id(s): ERIERL-217

               When master node is set do not force a load from
               ram_copies replica when there are no available
               disc_copies, since that would load an empty table. Wait
               until a disk replica is available or until user
               explicitly force_loads the table.


  OTP-15226    Application(s): mnesia
               Related Id(s): ERIERL-221

               Allow to add replicas even if all other replicas are
               down when the other replicas are not stored on disk.


  OTP-15231    Application(s): mnesia
               Related Id(s): PR-1858

               Fixed mnesia:delete_object/1 bug, where delete_object
               was deleting the record if it was written in the same
               transaction even if it was written to a different
               value.


  OTP-15243    Application(s): mnesia

               Fixed a bug where the bag table index data was not
               deleted when objects were deleted.


 Full runtime dependencies of mnesia-4.15.5: erts-9.0, kernel-5.3,
 stdlib-3.4


 ---------------------------------------------------------------------
 --- observer-2.8.1 --------------------------------------------------
 ---------------------------------------------------------------------

 The observer-2.8.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of observer-2.8.1: erts-7.0, et-1.5,
 kernel-3.0, runtime_tools-1.8.14, stdlib-3.5, wx-1.2


 ---------------------------------------------------------------------
 --- odbc-2.12.2 -----------------------------------------------------
 ---------------------------------------------------------------------

 The odbc-2.12.2 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of odbc-2.12.2: erts-6.0, kernel-3.0,
 stdlib-2.0


 ---------------------------------------------------------------------
 --- os_mon-2.4.6 ----------------------------------------------------
 ---------------------------------------------------------------------

 The os_mon-2.4.6 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of os_mon-2.4.6: erts-6.0, kernel-3.0,
 mnesia-4.12, otp_mibs-1.0.9, sasl-2.4, snmp-4.25.1, stdlib-2.0


 ---------------------------------------------------------------------
 --- otp_mibs-1.2.1 --------------------------------------------------
 ---------------------------------------------------------------------

 The otp_mibs-1.2.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of otp_mibs-1.2.1: erts-6.0, kernel-3.0,
 mnesia-4.12, snmp-4.25.1, stdlib-2.0


 ---------------------------------------------------------------------
 --- parsetools-2.1.8 ------------------------------------------------
 ---------------------------------------------------------------------

 The parsetools-2.1.8 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of parsetools-2.1.8: erts-6.0, kernel-3.0,
 stdlib-2.5


 ---------------------------------------------------------------------
 --- public_key-1.6.2 ------------------------------------------------
 ---------------------------------------------------------------------

 The public_key-1.6.2 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15284    Application(s): public_key

               Removed #DSAPrivateKey{} as acceptable input to
               public_key:verify/5.


 --- Improvements and New Features ---

  OTP-15134    Application(s): crypto, public_key

               *** HIGHLIGHT ***

               The typing in the CRYPTO and PUBLIC_KEY applications
               are reworked and a few mistakes are corrected.

               The documentation is now generated from the typing and
               some clarifications are made.

               A new chapter on Algorithm Details such as key sizes
               and availability is added to the CRYPTO User's Guide.


 Full runtime dependencies of public_key-1.6.2: asn1-3.0, crypto-3.8,
 erts-6.0, kernel-3.0, stdlib-3.5


 ---------------------------------------------------------------------
 --- reltool-0.7.7 ---------------------------------------------------
 ---------------------------------------------------------------------

 The reltool-0.7.7 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of reltool-0.7.7: erts-7.0, kernel-3.0,
 sasl-2.4, stdlib-3.4, tools-2.6.14, wx-1.2


 ---------------------------------------------------------------------
 --- runtime_tools-1.13.1 --------------------------------------------
 ---------------------------------------------------------------------

 The runtime_tools-1.13.1 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15163    Application(s): runtime_tools
               Related Id(s): PR-1844

               Optimize observer by using new system_info(ets_count)
               instead of more expensive length(ets:all()).


 Full runtime dependencies of runtime_tools-1.13.1: erts-8.0,
 kernel-5.0, mnesia-4.12, stdlib-3.0


 ---------------------------------------------------------------------
 --- sasl-3.2.1 ------------------------------------------------------
 ---------------------------------------------------------------------

 The sasl-3.2.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of sasl-3.2.1: erts-9.0, kernel-5.3,
 stdlib-3.4, tools-2.6.14


 ---------------------------------------------------------------------
 --- snmp-5.2.12 -----------------------------------------------------
 ---------------------------------------------------------------------

 The snmp-5.2.12 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15287    Application(s): snmp
               Related Id(s): ERIERL-206

               Conversion of (agent) Audit Trail Log (ATL) failed due
               to invalid log entries.

               The conversion aborted completely midway because the
               ATL contained invalid entries. The conversion has been
               improved so that it now firstly handles encountered
               errors and write an informative message (into the
               converted stream) and secondly keeps count of the
               number of successful or failed entry conversions. See
               log_to_txt for more info.

               The reason the ATL contained invalid entries have also
               been fixed. The reason was that for some outgoing
               messages (not response):

               -- encrypted (v3 messages)

               Was logged "as is" (encrypted) without the info to
               decrypt, making conversion impossible (which was the
               reason the log contained bad entries).

               -- un-encrypted

               Was not logged at all.


  OTP-15290    Application(s): snmp

               [compiler] Spurious version message removed. The snmp
               mib compiler printed an spurious version message if the
               'version' option was provided.


 Full runtime dependencies of snmp-5.2.12: crypto-3.3, erts-6.0,
 kernel-3.0, mnesia-4.12, runtime_tools-1.8.14, stdlib-2.5


 ---------------------------------------------------------------------
 --- ssh-4.7.1 -------------------------------------------------------
 ---------------------------------------------------------------------

 The ssh-4.7.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15020    Application(s): ssh

               Extended the undocumented ssh_dbg debug module with an
               api for a circular trace buffer. This makes it easy to
               record the last low-level events before an error is
               detected. It is intended for solving difficult errors.


  OTP-15133    Application(s): ssh
               Related Id(s): OTP-15240

               *** HIGHLIGHT ***

               The key exchange methods
               '[email protected]', 'curve25519-sha256' and
               'curve448-sha512' are implemented. The last two are
               defined in
               https://tools.ietf.org/html/draft-ietf-curdle-ssh-curves

               They all depends on that OpenSSL 1.1.1 or higher is
               used as cryptolib.


  OTP-15209    Application(s): ssh
               Related Id(s): OTP-15164

               *** HIGHLIGHT ***

               The cipher '[email protected]' is now
               supported if OpenSSL 1.1.1 or higher is used as
               cryptolib.


 Full runtime dependencies of ssh-4.7.1: crypto-4.2, erts-6.0,
 kernel-3.0, public_key-1.5.2, stdlib-3.3


 ---------------------------------------------------------------------
 --- ssl-9.0.2 -------------------------------------------------------
 ---------------------------------------------------------------------

 The ssl-9.0.2 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15122    Application(s): ssl

               Use separate processes for sending and receiving
               application data for TLS connections to avoid potential
               deadlock that was most likely to occur when using TLS
               for Erlang distribution. Note does not change the API.


  OTP-15168    Application(s): ssl

               Correct handling of empty server SNI extension


  OTP-15172    Application(s): ssl

               Correct PSK cipher suite handling and add
               selected_cipher_suite to connection information


  OTP-15173    Application(s): ssl

               Adopt to the fact that cipher suite sign restriction
               are relaxed in TLS-1.2


  OTP-15174    Application(s): ssl

               Enhance error handling of non existing PEM files


  OTP-15216    Application(s): ssl

               Correct close handling of transport accepted sockets in
               the error state


  OTP-15224    Application(s): ssl

               Correct PEM cache to not add references to empty
               entries when PEM file does not exist.


  OTP-15285    Application(s): ssl

               Correct handling of all PSK cipher suites

               Before only some PSK suites would be correctly
               negotiated and most PSK ciphers suites would fail the
               connection.


 --- Improvements and New Features ---

  OTP-12983    Application(s): ssl

               TLS will now try to order certificate chains if they
               appear to be unordered. That is prior to TLS 1.3,
               “certificate_list” ordering was required to be strict,
               however some implementations already allowed for some
               flexibility. For maximum compatibility, all
               implementations SHOULD be prepared to handle
               potentially extraneous certificates and arbitrary
               orderings from any TLS version.


  OTP-15060    Application(s): ssl

               TLS will now try to reconstructed an incomplete
               certificate chains from its local CA-database and use
               that data for the certificate path validation. This
               especially makes sense for partial chains as then the
               peer might not send an intermediate CA as it is
               considered the trusted root in that case.


  OTP-15193    Application(s): ssl

               Option keyfile defaults to certfile and should be
               trumped with key. This failed for engine keys.


  OTP-15234    Application(s): ssl

               Error message improvement when own certificate has
               decoding issues, see also issue ERL-668.


  OTP-15281    Application(s): ssl

               Correct dialyzer spec for key option


 Full runtime dependencies of ssl-9.0.2: crypto-4.2, erts-10.0,
 inets-5.10.7, kernel-6.0, public_key-1.5, stdlib-3.5


 ---------------------------------------------------------------------
 --- stdlib-3.6 ------------------------------------------------------
 ---------------------------------------------------------------------

 The stdlib-3.6 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15252    Application(s): stdlib
               Related Id(s): ERL-667

               The specs of filename:basedir/2,3 are corrected.


 --- Improvements and New Features ---

  OTP-15253    Application(s): stdlib
               Related Id(s): ERL-55, OTP-13229

               Let dets:open_file() exit with a badarg message if
               given a raw file name (a binary).


  OTP-15304    Application(s): stdlib

               The Format argument of the formatting functions in
               modules io and io_lib is accepted even if it is, for
               example, a list of binaries. This is how it used to be
               before Erlang/OTP 21.0.


 Full runtime dependencies of stdlib-3.6: compiler-5.0, crypto-3.3,
 erts-10.0, kernel-6.0, sasl-3.0


 ---------------------------------------------------------------------
 --- syntax_tools-2.1.6 ----------------------------------------------
 ---------------------------------------------------------------------

 The syntax_tools-2.1.6 application can be applied independently of
 other applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15207    Application(s): syntax_tools
               Related Id(s): PR-1888

               Fix the TypeName type in erl_syntax_lib.


  OTP-15291    Application(s): syntax_tools
               Related Id(s): ERL-719

               Correct unfolding of the stacktrace variable.


  OTP-15294    Application(s): syntax_tools

               Correct erl_syntax:revert/1 bug regarding the types
               map() and tuple().


 --- Improvements and New Features ---

  OTP-15165    Application(s): syntax_tools
               Related Id(s): PR-1842

               Support bitstrings as literals in module erl_syntax.


 Full runtime dependencies of syntax_tools-2.1.6: compiler-7.0,
 erts-9.0, kernel-5.0, stdlib-3.4


 ---------------------------------------------------------------------
 --- tftp-1.0.1 ------------------------------------------------------
 ---------------------------------------------------------------------

 The tftp-1.0.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of tftp-1.0.1: kernel-6.0, stdlib-3.5


 ---------------------------------------------------------------------
 --- tools-3.0.1 -----------------------------------------------------
 ---------------------------------------------------------------------

 The tools-3.0.1 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Improvements and New Features ---

  OTP-15213    Application(s): tools
               Related Id(s): PR-1807

               The HTML pages generated by cover:analyse_to_file/1 and
               related functions is improved for readability.


  OTP-15239    Application(s): tools
               Related Id(s): PR-1728

               Add alignment functionality in emacs.


 Full runtime dependencies of tools-3.0.1: compiler-5.0, erts-9.1,
 kernel-5.4, runtime_tools-1.8.14, stdlib-3.4


 ---------------------------------------------------------------------
 --- wx-1.8.5 --------------------------------------------------------
 ---------------------------------------------------------------------

 The wx-1.8.5 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15230    Application(s): wx
               Related Id(s): PR-1860

               Fixed compilation warning on Darwin.


 Full runtime dependencies of wx-1.8.5: erts-6.0, kernel-3.0,
 stdlib-2.0


 ---------------------------------------------------------------------
 --- xmerl-1.3.18 ----------------------------------------------------
 ---------------------------------------------------------------------

 The xmerl-1.3.18 application can be applied independently of other
 applications on a full OTP 21 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-15190    Application(s): debugger, edoc, eldap, et, eunit, ftp,
               hipe, jinterface, megaco, observer, odbc, os_mon,
               otp_mibs, parsetools, reltool, sasl, tftp, xmerl

               Improved documentation.


 Full runtime dependencies of xmerl-1.3.18: erts-6.0, kernel-3.0,
 stdlib-2.5


 ---------------------------------------------------------------------
 ---------------------------------------------------------------------
 ---------------------------------------------------------------------