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 - A new `versions` module has been added to the `runtime_tools` application containing functions for, e.g., comparing, versions that adhere to the [OTP Versions Scheme]. The documentation of the OTP Versions Scheme has also been improved. Own Id: OTP-20352 Related Id(s): PR-11556, PR-11600 # 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 - A new `versions` module has been added to the `runtime_tools` application containing functions for, e.g., comparing, versions that adhere to the [OTP Versions Scheme]. The documentation of the OTP Versions Scheme has also been improved. Own Id: OTP-20352 Related Id(s): PR-11556, PR-11600 > #### 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