github erlang/otp OTP-29.1
OTP 29.1
on GitHub

10 hours ago
Patch Package:           OTP 29.1
Git Tag:                 OTP-29.1
Date:                    2026-09-16
Trouble Report Id:       OTP-19631, OTP-20118, OTP-20131, OTP-20145,
                         OTP-20152, OTP-20158, OTP-20169, OTP-20175,
                         OTP-20177, OTP-20180, OTP-20187, OTP-20188,
                         OTP-20189, OTP-20209, OTP-20211, OTP-20213,
                         OTP-20218, OTP-20228, OTP-20235, OTP-20236,
                         OTP-20238, OTP-20246, OTP-20249, OTP-20254,
                         OTP-20255, OTP-20256, OTP-20262, OTP-20265,
                         OTP-20267, OTP-20276, OTP-20277, OTP-20280,
                         OTP-20290, OTP-20291, OTP-20292, OTP-20293,
                         OTP-20295, OTP-20297, OTP-20298, OTP-20303,
                         OTP-20304, OTP-20305, OTP-20309, OTP-20316,
                         OTP-20317, OTP-20318, OTP-20320, OTP-20322,
                         OTP-20326, OTP-20327, OTP-20328, OTP-20331,
                         OTP-20335, OTP-20338, OTP-20339, OTP-20352,
                         OTP-20354, OTP-20356, OTP-20358, OTP-20362,
                         OTP-20364, OTP-20365, OTP-20367, OTP-20373,
                         OTP-20374
Seq num:                 ERIERL-1356, GH-10879, GH-10968, GH-11093,
                         GH-11119, GH-11155, GH-11248, GH-11308,
                         GH-11338, GH-11344, GH-11349, GH-11351,
                         GH-11352, GH-11360, GH-11366, GH-11367,
                         GH-11397, GH-11398, GH-11401, GH-11406,
                         GH-11413, GH-11414, GH-11423, GH-11472,
                         GH-11534, GH-4417, GH-7862, GH-9302,
                         OTP-20102, PR-10297, PR-11074, PR-11096,
                         PR-11097, PR-11115, PR-11128, PR-11129,
                         PR-11130, PR-11133, PR-11137, PR-11144,
                         PR-11159, PR-11165, PR-11167, PR-11170,
                         PR-11196, PR-11203, PR-11216, PR-11226,
                         PR-11249, PR-11260, PR-11274, PR-11284,
                         PR-11300, PR-11313, PR-11316, PR-11324,
                         PR-11335, PR-11345, PR-11356, PR-11359,
                         PR-11361, PR-11363, PR-11375, PR-11376,
                         PR-11378, PR-11379, PR-11388, PR-11390,
                         PR-11391, PR-11396, PR-11410, PR-11422,
                         PR-11424, PR-11426, PR-11438, PR-11440,
                         PR-11442, PR-11444, PR-11446, PR-11447,
                         PR-11460, PR-11466, PR-11477, PR-11501,
                         PR-11505, PR-11507, PR-11530, PR-11552,
                         PR-11556, PR-11563, PR-11566, PR-11567,
                         PR-11570, PR-11574, PR-11600
System:                  OTP
Release:                 29
Application:             asn1-5.5.1, common_test-1.31.2,
                         compiler-10.0.5, crypto-5.10, dialyzer-6.0.3,
                         erts-17.1, inets-9.8, kernel-11.0.4,
                         mnesia-4.27, odbc-2.17.1, public_key-1.21.6,
                         runtime_tools-2.5, ssl-11.7.6, stdlib-8.1,
                         syntax_tools-4.1.1, tools-4.2.3, wx-2.7
Predecessor:             OTP 29.0.6

Check out the git tag OTP-29.1, 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.

POTENTIAL INCOMPATIBILITIES

  • When beam_lib returns an error tuple, the filename in the information tuple is now a list of characters instead of an atom.

    Example: 

    1> beam_lib:chunks(code:which(lists), ["nope"]).
{error,beam_lib,
       {missing_chunk,".../git/otp/lib/stdlib/ebin/lists.beam",
                      "nope"}}

    The reason for this change is that a long file name is not guaranteed to fit in an atom. Applications or tools that do deep inspection of the beam_lib errors (not recommended) will need to be updated.

    Own Id: OTP-20118
    Application(s): stdlib
    Related Id(s): PR-11167

OTP-29.1

Improvements and New Features

asn1-5.5.1

The asn1-5.5.1 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • The modern representation of BITSTRINGs is now always supported for encoding, regardless of any legacy options given. The JER backend would not support the modern representation when any legacy option was given.

    Own Id: OTP-20145
    Related Id(s): PR-11097

  • The make clean command did not remove all generated .erl files.

    Own Id: OTP-20295
    Related Id(s): PR-11375

Full runtime dependencies of asn1-5.5.1

erts-14.0, kernel-9.0, stdlib-5.0

common_test-1.31.2

The common_test-1.31.2 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • The internal cte_track event handler now correctly displays the suite name for suites without an init_per_suite/1 callback.

    Own Id: OTP-20316
    Related Id(s): PR-11501

Full runtime dependencies of common_test-1.31.2

compiler-10.0, crypto-4.5, debugger-4.1, erts-7.0, ftp-1.0, inets-6.0, kernel-11.0, observer-2.1, runtime_tools-1.8.16, sasl-2.5, snmp-5.1.2, ssh-4.0, stdlib-8.0, syntax_tools-1.7, tools-3.2, xmerl-1.3.8

compiler-10.0.5

The compiler-10.0.5 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • Fixed a native record crash in the sys_core_fold compiler pass.

    Own Id: OTP-20254
    Related Id(s): GH-11351, PR-11359

  • The compiler could crash when compiling a map comprehension.

    Own Id: OTP-20255
    Related Id(s): GH-11352, PR-11363

  • Fixed a crash when the key pattern in a map comprehension was a bitstring.

    Own Id: OTP-20262
    Related Id(s): GH-11367, PR-11379

  • Fixed an issue that could crash the compiler when compiling comprehensions with the compr_assign feature enabled.

    Own Id: OTP-20267
    Related Id(s): GH-11366, PR-11390

  • Code that called erlang:0() inside a fun could crash the compiler.

    Own Id: OTP-20280
    Related Id(s): GH-11414, PR-11424

  • Fixed an internal error when lists:keyfind/3 is called with an argument that exceeds system limits.

    Own Id: OTP-20291
    Related Id(s): GH-11413, PR-11444

  • An incorrect useless_building warning has been eliminated.

    Own Id: OTP-20304
    Related Id(s): GH-11472, PR-11477

  • In rare circumstances, the type analysis pass of the compiler could run for many minutes.

    Own Id: OTP-20365
    Related Id(s): GH-11534, PR-11566

Full runtime dependencies of compiler-10.0.5

crypto-5.1, erts-13.0, kernel-8.4, stdlib-8.0

crypto-5.10

The crypto-5.10 application can be applied independently of other applications on a full OTP 29 installation.

Improvements and New Features

  • The documentation of the crypto module now contains runnable examples for most functions. The examples are verified by the crypto test suite, so they always match actual behavior.

    Own Id: OTP-20373
    Related Id(s): PR-11170

Full runtime dependencies of crypto-5.10

erts-9.0, kernel-6.0, stdlib-3.9

dialyzer-6.0.3

The dialyzer-6.0.3 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • Fixed Dialyzer crash when overriding built-in types.

    Own Id: OTP-19631
    Related Id(s): GH-11093, PR-11096

  • Typer crashed when multiple functions were written in the same line. For example: 

    -module(m).
f() -> ok. g() -> ok.

    Own Id: OTP-20297
    Related Id(s): PR-11466

Full runtime dependencies of dialyzer-6.0.3

compiler-10.0, erts-12.0, kernel-8.0, stdlib-5.0, syntax_tools-2.0

erts-17.1

The erts-17.1 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • Fixed bug in ets:member/2 for set, bag and duplicate_bag. The bug could (maybe) lead to ets:member spuriously returning false for a value which is actually a member for a table that faces high insert load.

    Own Id: OTP-20152
    Related Id(s): PR-11115

  • Fixed crashing bug caused by race between timer creating process and suspending receiver of the timer. Only seen to cause crash one time by extremely provoking test case. Bug exists only since OTP 29.0.

    Own Id: OTP-20175
    Related Id(s): PR-11196

  • Fixed bug in enif_realloc_binary when called with a read-only binary. Instead of returning false at out-of-memory failure, it returned true and did nothing.

    Own Id: OTP-20187
    Related Id(s): PR-11133

  • Fixed alternate signal stack sizing on musl (Alpine) running on CPUs whose Linux kernel reports large signal frames (AVX-512/AMX). It caused emulator to abort during startup with "Failed to set alternate signal stack".

    Own Id: OTP-20213
    Related Id(s): GH-11248, PR-11249

  • For socket:recvmmsg/6, the buffer length was not handled correctly when the OS network stack truncated the received message, so garbage data with incorrect length could be delivered to the calling process. This bug has been corrected.

    Own Id: OTP-20246
    Related Id(s): PR-11335

  • binary_to_term/1 will now reject an external native record with duplicated fields.

    Own Id: OTP-20276
    Related Id(s): GH-11398, PR-11410

  • Fixed a crash upon starting the emulator on systems with a very large minimum signal stack size.

    Own Id: OTP-20292
    Related Id(s): GH-11349, PR-11376

  • Fixed lock order violation during crash dump due to export table exhaustion. Only problem for debug emulator.

    Own Id: OTP-20305
    Related Id(s): PR-11460

  • Fixed rounding errors when converting large integers to floating point numbers, explicitly with float/1 or implicitly in arithmetic such as 1.0 * N. Integers with absolute values larger than 64 bits that could not be represented exactly as a float could be rounded to the second nearest float instead of the nearest. For example, float(428654966685883400000) returned 4.2865496668588343e20 instead of the correct 4.286549666858834e20, which is what binary_to_float/1 returns for the same number.

    Own Id: OTP-20317
    Related Id(s): PR-11391

  • An error check in prim_inet has been fixed. This manifested itself as file:sendfile/* sometimes crashing instead of returning an error when the remote end closes the socket during initialization.

    Own Id: OTP-20356
    Related Id(s): PR-11438

Improvements and New Features

  • Fairness of code permission locks have been improved to avoid long latencies for code loading and trace operations.

    Own Id: OTP-20188
    Related Id(s): PR-11144

  • The BIFs that convert strings to integers (for example binary_to_integer/1) are now much faster for huge input strings. On a modern computer, even a string with more than a million decimal digits should finish in less than a second.

    The div and rem operators are now also much faster for large operands.

    Own Id: OTP-20209
    Related Id(s): PR-11074, PR-11324

  • Arithmetic operations on large integers will now increase the reduction count for the process, causing context switches to occur more frequently when doing arithmetic on large integers.

    Own Id: OTP-20211
    Related Id(s): PR-11274

Full runtime dependencies of erts-17.1

kernel-9.0, sasl-3.3, stdlib-4.1

inets-9.8

The inets-9.8 application can be applied independently of other applications on a full OTP 29 installation.

Improvements and New Features

  • OPTIONS is now accepted for HTTP/1.x requests and routed through the normal module pipeline like other standard methods. Requests that no module handles still receive a 501 (Not Implemented) response, so behavior is unchanged for deployments that do not add explicit OPTIONS handling.

    Own Id: OTP-20249
    Related Id(s): GH-11119, PR-11316

Full runtime dependencies of inets-9.8

erts-14.0, kernel-9.0, mnesia-4.12, public_key-1.13, runtime_tools-1.8.14, ssl-9.0, stdlib-5.0, stdlib-6.0

kernel-11.0.4

The kernel-11.0.4 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • Fixed incorrect TOS format when using gen_udp with the socket backend.

    Own Id: OTP-20131
    Related Id(s): GH-10968, OTP-20102

  • Decoding of names in inet_res has been tightened to not allow names longer than 255 octets, as according to RFC 1035.

    Decoding has also been made more strict by only allowing compression pointers to lower positions in the message.

    A few bugs when decoding malformed truncated DNS messages have also been fixed, as well as handling broken UTF-8 content in NAPTR RR:s regular expressions field.

    Own Id: OTP-20228
    Related Id(s): PR-11300

  • When using the socket backend in gen_tcp, the default value for the read_ahead option was incorrect and has been corrected, according the documentation, to be true.

    Own Id: OTP-20238
    Related Id(s): PR-11284

  • A field in net_kernel's internal state was not cleaned up in some cases for failed connections could cause the state to grow indefinitely over time. This has now been fixed.

    Own Id: OTP-20265
    Related Id(s): GH-11308, PR-11388

  • Fixed pg:which_groups/1 to not include empty groups where all members have leaved. Bug existed since OTP 29.0.

    Own Id: OTP-20303
    Related Id(s): GH-11360, PR-11361

Full runtime dependencies of kernel-11.0.4

crypto-5.8, erts-17.0, sasl-3.0, stdlib-8.0

mnesia-4.27

The mnesia-4.27 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • Fixed mnesia:force_load_table/1 getting stuck when the remote node becomes unreachable during table loading. When a network loader is aborted due to sender node going down and a user has forced a table load, we now retry loading from disc instead. Additionally, for disc_only_copies tables, the process actually loading the table is the dets server process, not the mnesia loader, so it would not receive the abort notification and would hang indefinitely. Now it correctly receives the notification and aborts table loading.

    Own Id: OTP-20256
    Related Id(s): GH-11344, PR-11426

  • Fixed incorrect results from mnesia:select_reverse/2,3 on ordered_set tables inside a transaction that had already written to or deleted from the same table. Deleted records could reappear, updated records could appear twice, and the descending order was not preserved.

    Own Id: OTP-20364
    Related Id(s): PR-11563

Improvements and New Features

  • The documentation of the mnesia module now contains runnable examples for most functions. The examples are verified by the mnesia test suite, so they always match actual behavior.

    Own Id: OTP-20374
    Related Id(s): PR-11216

Full runtime dependencies of mnesia-4.27

erts-9.0, kernel-5.3, stdlib-5.0

odbc-2.17.1

The odbc-2.17.1 application can be applied independently of other applications on a full OTP 29 installation.

Improvements and New Features

  • Added the max_long_column_size option to limit buffer allocation size preventing memory exhaustion.

    Own Id: OTP-20328
    Related Id(s): GH-9302, PR-10297

Full runtime dependencies of odbc-2.17.1

erts-6.0, kernel-3.0, stdlib-2.0

public_key-1.21.6

The public_key-1.21.6 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • Added missing no_cacerts_found clauses so that the intended {failed_load_cacerts, no_cacerts_found} error is raised and formatted properly.

    Own Id: OTP-20318
    Related Id(s): PR-11378

  • Align moduli and pubkey_moduli.hrl to state on OTP-28 and newer.

    Own Id: OTP-20367
    Related Id(s): PR-11574

Improvements and New Features

  • Worked around domain component using wrong ASN-1 PrintableString encoding instead of IA5String encoding.

    Own Id: OTP-20338
    Related Id(s): GH-10879, PR-11226

  • ASN.1 files are now compiled sequentially to guarantee reproducible builds.

    Own Id: OTP-20362
    Related Id(s): GH-4417, PR-11396

Full runtime dependencies of public_key-1.21.6

asn1-5.0, crypto-5.8, erts-13.0, kernel-8.0, stdlib-4.0

runtime_tools-2.5

The runtime_tools-2.5 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • Fixed bug if a process that called dbg:session/2 exits before dbg:session_destroy/1 is called. An error report was logged and any trace messages lost and not delivered.

    Own Id: OTP-20218
    Related Id(s): PR-11260

Improvements and New Features

Full runtime dependencies of runtime_tools-2.5

erts-16.0, kernel-10.0, mnesia-4.12, stdlib-6.0

ssl-11.7.6

Note! The ssl-11.7.6 application cannot be applied independently of other applications on an arbitrary OTP 29 installation. 

   On a full OTP 29 installation, also the following runtime
   dependency has to be satisfied:
   -- public_key-1.21.1 (first satisfied in OTP 29.0.1)

Fixed Bugs and Malfunctions

  • Undecodable certificate_authorities names are now skipped, as they are just a hint.

    Own Id: OTP-20327
    Related Id(s): GH-11338, PR-11356

  • Corrected generated keylog information generated from the keylog_hs option in the corner case that it was invoked after the client had reached its connection state, but the server closed the connection before it reached its connection state.

    Own Id: OTP-20358
    Related Id(s): ERIERL-1356, PR-11570

Improvements and New Features

  • Added TLS-1.3 selected_group to ssl:connection_information/2.

    Own Id: OTP-20326
    Related Id(s): PR-11440

  • The ECDHE-PSK Chacha20-Poly1305 cipher suites are now supported. This is relevant for TLS-1.2 (and lower).

    Own Id: OTP-20331
    Related Id(s): PR-11345

Full runtime dependencies of ssl-11.7.6

crypto-5.8, erts-16.0, inets-5.10.7, kernel-10.3, public_key-1.21.1, runtime_tools-1.15.1, stdlib-7.0

stdlib-8.1

The stdlib-8.1 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • When beam_lib returns an error tuple, the filename in the information tuple is now a list of characters instead of an atom.

    Example: 

    1> beam_lib:chunks(code:which(lists), ["nope"]).
{error,beam_lib,
       {missing_chunk,".../git/otp/lib/stdlib/ebin/lists.beam",
                      "nope"}}

    The reason for this change is that a long file name is not guaranteed to fit in an atom. Applications or tools that do deep inspection of the beam_lib errors (not recommended) will need to be updated.

    Own Id: OTP-20118
    Related Id(s): PR-11167

    *** POTENTIAL INCOMPATIBILITY ***

  • The default seed in the rand module has been improved to spread out its entropy over all three seed words.

    This avoids identical first random numbers from two successive seeds on machines with low system time resolution.

    Own Id: OTP-20158
    Related Id(s): PR-11165

  • Fixed unicode:characters_to_binary/2 to handle incomplete utf-32 sequences without crashing.

    Also fixed a performance regression in unicode:characters_to_nfkd_list/1.

    Own Id: OTP-20169
    Related Id(s): PR-11130

  • The array module has been improved. array:slice/3 now raises badarg for negative lengths.

    The performance of array:mapfoldl/3 and array:sparse_mapfoldl/3 has been improved.

    The documentation has been clarified regarding array growth/shrink behavior and how concat/1,2 handles mixed arrays.

    Own Id: OTP-20177
    Related Id(s): PR-11159

  • Added more checks in the linter for badly formed {Name,Arity} attributes

    Own Id: OTP-20277
    Related Id(s): GH-11397, PR-11422

  • Fixed return value of zip:zip_get/2. When a file was extracted to a directory, the function returned a map instead of a file name.

    Own Id: OTP-20298
    Related Id(s): PR-11313

  • When compr_assign is enabled, the linter will correctly check for unbounded variables after block expressions in comprehensions.

    Own Id: OTP-20309
    Related Id(s): GH-11406, PR-11567

  • When compiling a module with a triple-quoted string with escape sequences and a chunk boundary happened to fall just after an escape character, that character was not passed to the reentrancy continuation, so the scanner interpreted the following characters as not an escape sequence.

    This bug has now been fixed.

    Own Id: OTP-20320
    Related Id(s): GH-11423, PR-11505

  • Fixed some errors in examples in the documentation for the string and uri_string modules.

    Own Id: OTP-20322
    Related Id(s): PR-11446

  • Linter will emit better error messages when a behaviour attribute has a bad module name.

    Own Id: OTP-20354
    Related Id(s): GH-11401, PR-11552

Improvements and New Features

  • uri_string:parse/1 now reports the actual offending character in error tuples instead of reporting a misleading cascade-failure position.

    Previously, when parsing a URI containing an invalid character (such as | or non-ASCII characters like ö), the error tuple would point to the : character — the position where the parser's final backtracking attempt failed — rather than the character that actually violated the URI grammar. For example, uri_string:parse("http://localhost/A|B") returned {error,invalid_uri,":"} instead of the more helpful {error,invalid_uri,"|"}

    Own Id: OTP-20235
    Related Id(s): GH-7862, PR-11129

  • Fixed a guard precedence bug in uri_string:compose_query/2 that caused inconsistent error handling depending on the encoding option.

    When compose_query/2 was called with invalid input (e.g. an atom instead of a string) and {encoding, unicode}, it would crash with ** exception error: bad argument instead of returning the expected {error, invalid_input, Term} tuple. The same call with {encoding, utf8} correctly returned the error tuple. Both encoding options now consistently return {error, invalid_input, Term} for invalid input.

    Own Id: OTP-20236
    Related Id(s): PR-11128

Full runtime dependencies of stdlib-8.1

compiler-5.0, crypto-4.5, erts-16.0.3, kernel-11.0, sasl-3.0, syntax_tools-3.2.1

syntax_tools-4.1.1

The syntax_tools-4.1.1 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • Fixed exception when the epp_dodger AST contains macro-named record.

    Own Id: OTP-20180
    Related Id(s): GH-11155, PR-11203

  • Any caller who passed a single syntax tree that was not a form_list (e.g. erl_recomment:recomment_forms(erl_syntax:atom(foo), Cs) or any expression/function tree) would get a hard crash instead of the documented result. This issue has been fixed.

    Own Id: OTP-20290
    Related Id(s): PR-11442

Full runtime dependencies of syntax_tools-4.1.1

compiler-9.0, erts-16.0, kernel-10.3, stdlib-8.0

tools-4.2.3

The tools-4.2.3 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • The tags.erl module is used to generate TAGS files for Emacs. There was a case where single quote items starting in position 0 would crash the scanner. This use case can potentially happen in docstrings, although not too common. This fix makes the scanner to handle such cases instead of crashing.

    Own Id: OTP-20293
    Related Id(s): PR-11447

  • Updated the Emacs skeleton to reflect latest format_status callback handling.

    Own Id: OTP-20339
    Related Id(s): PR-11507

Full runtime dependencies of tools-4.2.3

compiler-8.5, crypto-5.9, erts-15.0, kernel-10.0, public_key-1.21, runtime_tools-2.1, stdlib-6.0

wx-2.7

The wx-2.7 application can be applied independently of other applications on a full OTP 29 installation.

Fixed Bugs and Malfunctions

  • A large set of correctness and robustness fixes were applied across the wx application, addressing issues found by static analysis of both the Erlang and C/C++ sources.

    Own Id: OTP-20335
    Related Id(s): PR-11530

Improvements and New Features

  • Removed configure checks that prevented cross compilation of wx. Note that cross compilation is not tested and may require manual configuration.

    Own Id: OTP-20189
    Related Id(s): PR-11137

Full runtime dependencies of wx-2.7

erts-12.0, kernel-8.0, stdlib-5.0

Thanks to

Alois Vitasek, Anton Thomasson, ausimian, Bernhard M. Wiedemann, Cole Christensen, Dmitri Vereshchagin, Dmytro Lytovchenko, Eric Meadows-Jönsson, haoxian, Jianbo He, João Henrique Ferreira de Freitas, Johan Bevemyr, John Downey, Jonatan Männchen, Julian Doherty, kagetora66, k-patrik, Louis Pilfold, Lukasz Samson, Luke Bakken, Maria Scott, Mikael Pettersson, Paul Guyot, Renato Ceolin, ruslandoga, Scott Wiggins, Stanislav Yaglo, Thomas Arts, Thomas Cioppettini, Zeke Dou, zmstone

Check out latest releases or
releases around erlang/otp OTP-29.1

Don't miss a new otp release

NewReleases is sending notifications on new releases.

Get notifications