path: root/release-notes/OTP-26.1.README.txt

Patch Package:           OTP 26.1
Git Tag:                 OTP-26.1
Date:                    2023-09-20
Trouble Report Id:       OTP-14480, OTP-18579, OTP-18582, OTP-18586,
                         OTP-18592, OTP-18598, OTP-18599, OTP-18605,
                         OTP-18611, OTP-18614, OTP-18615, OTP-18616,
                         OTP-18623, OTP-18627, OTP-18628, OTP-18629,
                         OTP-18631, OTP-18633, OTP-18638, OTP-18644,
                         OTP-18645, OTP-18647, OTP-18654, OTP-18655,
                         OTP-18660, OTP-18661, OTP-18662, OTP-18664,
                         OTP-18666, OTP-18669, OTP-18670, OTP-18672,
                         OTP-18674, OTP-18675, OTP-18676, OTP-18677,
                         OTP-18678, OTP-18679, OTP-18681, OTP-18683,
                         OTP-18685, OTP-18686, OTP-18687, OTP-18688,
                         OTP-18689, OTP-18690, OTP-18691, OTP-18692,
                         OTP-18693, OTP-18694, OTP-18696, OTP-18697,
                         OTP-18698, OTP-18700, OTP-18701, OTP-18702,
                         OTP-18704, OTP-18705, OTP-18706, OTP-18707,
                         OTP-18708, OTP-18710, OTP-18711, OTP-18712,
                         OTP-18718, OTP-18719, OTP-18721, OTP-18722,
                         OTP-18723, OTP-18724, OTP-18725, OTP-18729,
                         OTP-18731, OTP-18732, OTP-18733, OTP-18734,
                         OTP-18736, OTP-18737, OTP-18738, OTP-18740,
                         OTP-18745, OTP-18746, OTP-18747, OTP-18748,
                         OTP-18752, OTP-18753, OTP-18754, OTP-18755,
                         OTP-18757, OTP-18758, OTP-18759, OTP-18763
Seq num:                 ERIERL-43, ERIERL-957, ERIERL-959,
                         ERIERL-962, ERIERL-963, ERIERL-965,
                         ERIERL-979, GH-6074, GH-6339, GH-6394,
                         GH-6460, GH-6461, GH-7119, GH-7162, GH-7258,
                         GH-7280, GH-7292, GH-7298, GH-7317, GH-7325,
                         GH-7336, GH-7344, GH-7381, GH-7401, GH-7409,
                         GH-7410, GH-7413, GH-7417, GH-7431, GH-7436,
                         GH-7444, GH-7459, GH-7467, GH-7468, GH-7469,
                         GH-7477, GH-7482, GH-7488, GH-7492, GH-7504,
                         GH-7506, GH-7507, GH-7510, GH-7517, GH-7524,
                         GH-7546, GH-7566, GH-7569, GH-7577, GH-7584,
                         GH-7605, GH-7606, GH-7655
System:                  OTP
Release:                 26
Application:             asn1-5.2, common_test-1.25.1, compiler-8.4,
                         crypto-5.3, debugger-5.3.2, dialyzer-5.1.1,
                         erl_docgen-1.5.1, erts-14.1, inets-9.0.2,
                         kernel-9.1, megaco-4.5, mnesia-4.22.1,
                         observer-2.15.1, public_key-1.14.1,
                         snmp-5.15, ssl-11.0.3, stdlib-5.1
Predecessor:             OTP 26.0.2

 Check out the git tag OTP-26.1, 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-18746    Application(s): stdlib
               Related Id(s): PR-7313, PR-7456

               *** POTENTIAL INCOMPATIBILITY ***

               A warning for (accidental use of) Triple-Quoted Strings
               has been implemented as per EEP 64.


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

  OTP-18696    Application(s): stdlib

               Pattern matching and equivalence (=:=, =/=) comparisons
               on 0.0 will now raise a warning, as it will no longer
               be considered equivalent to -0.0 in OTP 27.

               If a match on 0.0 specifically is desired (distinct
               from -0.0), the warning can be suppressed by writing
               +0.0 instead.

               The arithmetic comparison operators are unaffected,
               including arithmetic equality (==).


  OTP-18746    Application(s): stdlib
               Related Id(s): PR-7313, PR-7456

               *** HIGHLIGHT ***

               A warning for (accidental use of) Triple-Quoted Strings
               has been implemented as per EEP 64.


 ---------------------------------------------------------------------
 --- asn1-5.2 --------------------------------------------------------
 ---------------------------------------------------------------------

 The asn1-5.2 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18729    Application(s): asn1
               Related Id(s): PR-7575

               The ASN.1 compiler would ignore a constraint such as
               (SIZE (1..4), ...), causing incorrect behavior of the
               encoding and decoding function for the PER and UPER
               backends. Corrected to handle the constraint in the
               same way as (SIZE (1..4, ...)).


 --- Improvements and New Features ---

  OTP-18748    Application(s): asn1
               Related Id(s): ERIERL-957, PR-7637

               The JER backend has been internally refactored in a way
               that is compatible for applications that use the
               documented API. However, for a group of ASN.1 modules
               that depend on each other (for example,
               S1AP-PDU-Descriptions, S1AP-Contents, and so on), all
               modules in the group must be recompiled if on of the
               group members is recompiled.


 Full runtime dependencies of asn1-5.2: erts-11.0, kernel-7.0,
 stdlib-3.13


 ---------------------------------------------------------------------
 --- common_test-1.25.1 ----------------------------------------------
 ---------------------------------------------------------------------

 The common_test-1.25.1 application can be applied independently of
 other applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-14480    Application(s): common_test
               Related Id(s): ERIERL-43, OTP-11894, PR-7455

               With this change, ct_hooks manual refers to CTH
               execution order section in user guide.


  OTP-18579    Application(s): common_test
               Related Id(s): GH-7119

               With this change, Config data from pre_end_per_testcase
               hook is delivered to post_end_per_testcase callback in
               case of testcase timetrap or linked process crash.


  OTP-18615    Application(s): common_test
               Related Id(s): PR-7234

               With this change, remaining references to not supported
               vts tool in ct_run are removed (mainly relates to docs
               and ct_run help message).


  OTP-18664    Application(s): common_test
               Related Id(s): ERIERL-959

               With this change, prompt search functionality in
               ct_telnet handles unicode input.


  OTP-18676    Application(s): common_test, erl_docgen, erts, kernel,
               stdlib
               Related Id(s): GH-7459, PR-7473

               Expanded the documentation about how to use the
               standard_io, standard_error and user I/O devices.

               Added the types io:standard_io/0, io:standard:error/0
               and io:user/0.


 Full runtime dependencies of common_test-1.25.1: compiler-6.0,
 crypto-4.5, debugger-4.1, erts-7.0, ftp-1.0, inets-6.0, kernel-8.4,
 observer-2.1, runtime_tools-1.8.16, sasl-2.5, snmp-5.1.2, ssh-4.0,
 stdlib-4.0, syntax_tools-1.7, tools-3.2, xmerl-1.3.8


 ---------------------------------------------------------------------
 --- compiler-8.4 ----------------------------------------------------
 ---------------------------------------------------------------------

 The compiler-8.4 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18605    Application(s): compiler, stdlib
               Related Id(s): GH-7298, GH-7317

               The compiler could run forever when compiling a call to
               is_record/3 with a huge positive tuple size. The call
               is_record(A, a, 0) would crash the compiler when used
               in a function body. When used in a guard the compiler
               would emit incorrect code that would accept {a> as a
               record.


  OTP-18629    Application(s): compiler, dialyzer
               Related Id(s): GH-7325

               Fixed a bug that caused dialyzer to crash when
               analyzing bogus code that contained the literal atom
               undefined in segment sizes.


  OTP-18662    Application(s): compiler
               Related Id(s): GH-7409, PR-7416

               The compiler would crash when compiling some modules
               that contained a call to erlang:load_nif/2.


  OTP-18678    Application(s): compiler
               Related Id(s): GH-7488

               Fixed a bug that caused the compiler to crash on legal
               code.


  OTP-18689    Application(s): compiler
               Related Id(s): GH-7504, PR-7518

               The compiler could crash when attempting to compile a
               call to is_list/1 in a complex expression.


  OTP-18692    Application(s): compiler
               Related Id(s): GH-7517, PR-7519

               A complex guard expression using the or operator could
               succeed when it was supposed to fail.


  OTP-18701    Application(s): compiler
               Related Id(s): GH-7477, PR-7532

               Compiling nested try/catch and catch expression could
               result in an internal compiler error.


  OTP-18719    Application(s): compiler
               Related Id(s): GH-7468, PR-7562

               Using the bnot operator in a complex expression could
               cause the compiler to terminate with an internal
               consistency failure diagnostic.


  OTP-18721    Application(s): compiler
               Related Id(s): PR-7527

               Fixed a bug that caused the compiler to crash in a
               binary optimization pass.


  OTP-18725    Application(s): compiler
               Related Id(s): GH-7467

               The compiler could terminate with an internal error
               when attempting to compile a binary pattern that could
               not possibly match.


 --- Improvements and New Features ---

  OTP-18691    Application(s): compiler
               Related Id(s): PR-7448

               Fixed various performance issues related to the alias
               optimization pass.


 Full runtime dependencies of compiler-8.4: crypto-5.1, erts-13.0,
 kernel-8.4, stdlib-5.0


 ---------------------------------------------------------------------
 --- crypto-5.3 ------------------------------------------------------
 ---------------------------------------------------------------------

 The crypto-5.3 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18670    Application(s): crypto
               Related Id(s): GH-7436, PR-7450

               Fix VM crash caused by crypto being purged and reloaded
               (by init:restart for example) on OS with musl libc
               (such as Alpine linux).


  OTP-18758    Application(s): crypto
               Related Id(s): PR-7209

               Improved understanding of LibreSSL versions. Support
               chacha20 and chacha20_poly1305 for LibreSSL 3.7.
               Reflect removal of support for the DSS/DSA algorithm
               which was done in LibreSSL 2.6.1.


 --- Improvements and New Features ---

  OTP-18666    Application(s): crypto
               Related Id(s): PR-7392

               FIPS supported by crypto for OpenSSL 3.0.* and 3.1.*.


 Full runtime dependencies of crypto-5.3: erts-9.0, kernel-5.3,
 stdlib-3.9


 ---------------------------------------------------------------------
 --- debugger-5.3.2 --------------------------------------------------
 ---------------------------------------------------------------------

 The debugger-5.3.2 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18644    Application(s): debugger
               Related Id(s): GH-7336

               The call int:no_break(Module) did not remove any
               breakpoints.


  OTP-18740    Application(s): debugger
               Related Id(s): GH-7410, PR-7599

               The maybe expression is now supported in the Debugger.


 Full runtime dependencies of debugger-5.3.2: compiler-8.0, erts-12.0,
 kernel-8.0, stdlib-3.15, wx-2.0


 ---------------------------------------------------------------------
 --- dialyzer-5.1.1 --------------------------------------------------
 ---------------------------------------------------------------------

 The dialyzer-5.1.1 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18629    Application(s): compiler, dialyzer
               Related Id(s): GH-7325

               Fixed a bug that caused dialyzer to crash when
               analyzing bogus code that contained the literal atom
               undefined in segment sizes.


  OTP-18738    Application(s): dialyzer
               Related Id(s): GH-7584

               Dialyzer could crash when attempting to analyze a
               module that defined a type called product/.


 Full runtime dependencies of dialyzer-5.1.1: compiler-8.0, erts-12.0,
 kernel-8.0, stdlib-5.0, syntax_tools-2.0, wx-2.0


 ---------------------------------------------------------------------
 --- erl_docgen-1.5.1 ------------------------------------------------
 ---------------------------------------------------------------------

 The erl_docgen-1.5.1 application can be applied independently of
 other applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18676    Application(s): common_test, erl_docgen, erts, kernel,
               stdlib
               Related Id(s): GH-7459, PR-7473

               Expanded the documentation about how to use the
               standard_io, standard_error and user I/O devices.

               Added the types io:standard_io/0, io:standard:error/0
               and io:user/0.


 Full runtime dependencies of erl_docgen-1.5.1: edoc-1.0, erts-11.0,
 kernel-8.0, stdlib-3.15, xmerl-1.3.7


 ---------------------------------------------------------------------
 --- erts-14.1 -------------------------------------------------------
 ---------------------------------------------------------------------

 The erts-14.1 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18592    Application(s): erts

               maps:put with existing key and identical value was not
               optimized as a no-op correctly if having the same
               32-bit hash as another key in the map. In practice very
               rare and harmless.


  OTP-18623    Application(s): erts, kernel
               Related Id(s): GH-7344

               Fixed an issue with truncated crash slogans on failed
               emulator start.


  OTP-18645    Application(s): erts
               Related Id(s): GH-7401

               Fixed a bug where the emulator was unable to determine
               the current cgroup CPU quota.


  OTP-18647    Application(s): erts
               Related Id(s): PR-7595

               A process optimized for parallel signal delivery could
               under some circumstances lose wakeup information. That
               is, the processes was not woken up to take care of the
               signal, so the signal would not be taken care of until
               the process was woken by another signal. Only processes
               configured with message_queue_data set to off_heap
               utilize this optimization.


  OTP-18669    Application(s): erts, kernel
               Related Id(s): OTP-18029

               Function socket:close/1 could cause a VM crash on
               Windows.


  OTP-18672    Application(s): erts
               Related Id(s): GH-7469

               Fixed a bug in the ARM JIT where it could accidentally
               add garbage trailing bits when creating bitstrings
               whose size wasn't an even multiple of 8 bits.


  OTP-18674    Application(s): erts
               Related Id(s): PR-7472

               Fix erlang:system_info/1 documentation to show correct
               types.


  OTP-18676    Application(s): common_test, erl_docgen, erts, kernel,
               stdlib
               Related Id(s): GH-7459, PR-7473

               Expanded the documentation about how to use the
               standard_io, standard_error and user I/O devices.

               Added the types io:standard_io/0, io:standard:error/0
               and io:user/0.


  OTP-18702    Application(s): erts
               Related Id(s): GH-7381

               Fix compilation with GNU termcap.


  OTP-18706    Application(s): erts
               Related Id(s): ERIERL-979, GH-7413, PR-7595

               Delivery time of message signals to a process not
               executing any receive expressions could become very
               long, potentially infinite. For example, a process
               checking for messages using process_info(self(),
               message_queue_len) or process_info(self(), messages)
               and avoiding to execute a receive expression matching
               on messages could be very slow in detecting new
               messages. Note that you are still discouraged from
               using process_info() this way. A process that wants to
               check if there are messages available to handle should
               execute a receive expression matching on messages.


  OTP-18724    Application(s): erts
               Related Id(s): GH-7566, PR-7567

               On AArch64 (ARM64), when calculating both the quotient
               and remainder with a divisor begin a power two, the
               remainder could be incorrectly calculated.


  OTP-18732    Application(s): erts
               Related Id(s): GH-7444, PR-7458

               Fix bug causing "magic" references in a compressed ETS
               table to not keep the referred object alive. The
               symptom would be the referred object being garbage
               collected prematurely and the reference appearing
               stale, not referring to anything. Examples of such
               magically referred objects are atomics and NIF
               resources.


  OTP-18733    Application(s): erts
               Related Id(s): GH-7292

               Matching out short bitstrings with a fixed size not
               divisible by 8 could could lead to the runtime system
               terminating with an "Overrun heap and stack" error.


  OTP-18737    Application(s): erts
               Related Id(s): PR-7595

               A constant flow of incoming non-message signals could
               prevent a process needing to execute dirty from doing
               so.


  OTP-18745    Application(s): erts
               Related Id(s): GH-7492, PR-7616

               A BEAM file usually contains a chunk with the tag
               "Type" containing type information that can be used by
               the JIT. The beam_lib:strip/1 takes care to preserve
               that chunk, but a build/release tool that does
               customized stripping could accidentally remove the
               chunk. Loading a BEAM file without the "Type" chunk
               could cause incorrect behavior of the loaded code.


  OTP-18747    Application(s): erts, kernel
               Related Id(s): GH-7605

               gen_udp:recv/* for Unix Domain Socket in binary mode
               and passive mode has been fixed to not crash.


  OTP-18752    Application(s): erts
               Related Id(s): PR-7633

               The cleanup operation of not yet delivered signals to a
               terminated process yielded excessively.


  OTP-18753    Application(s): erts
               Related Id(s): PR-7634

               Fixed minor hashing issue with the local option of
               term_to_binary()/term_to_iovec().


 --- Improvements and New Features ---

  OTP-18586    Application(s): erts, kernel
               Related Id(s): OTP-18029

               Update gen_tcp_socket and gen_udp_socket to handle
               'completion' (socket on Windows).


  OTP-18611    Application(s): erts, kernel
               Related Id(s): #5024, OTP-18029

               Add support for Unix Domain Sockets (only for STREAM
               sockets) on Windows for 'socket'.


  OTP-18638    Application(s): erts

               In Erlang/OTP 27, by default escripts will be compiled
               before being executed. That means that the compiler
               application must be installed. It is possible to force
               the escript to be interpreted by adding the directive
               -mode(interpret). to the escript file.

               In Erlang/OTP 28, support for interpreting an escript
               will be removed.


  OTP-18660    Application(s): erts, kernel

               Add basic support for socket ioctl on Windows.


  OTP-18661    Application(s): erts
               Related Id(s): PR-6112

               Removed erts/etc/darwin/Info.plist, as it is no longer
               necessary after macos 10.12


  OTP-18686    Application(s): erts, kernel

               Add support for (Windows) socket option
               exclusiveaddruse.


  OTP-18687    Application(s): erts, kernel

               [socket] Add support for the 'nopush' option.


  OTP-18693    Application(s): erts, kernel

               Add support for socket option 'BSP STATE'.


  OTP-18698    Application(s): erts, kernel

               Add tcp socket options 'keepcnt', 'keepidle' and
               'keepintvl'.


  OTP-18710    Application(s): erts, kernel

               Add support for misc (Windows) socket options
               ('max_msg_size' and 'maxdg').


 Full runtime dependencies of erts-14.1: kernel-9.0, sasl-3.3,
 stdlib-4.1


 ---------------------------------------------------------------------
 --- inets-9.0.2 -----------------------------------------------------
 ---------------------------------------------------------------------

 The inets-9.0.2 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18582    Application(s): inets
               Related Id(s): GH-6074, PR-6892

               With this change, re_write httpd works as expected and
               does not return error.


  OTP-18688    Application(s): inets
               Related Id(s): ERIERL-962

               Fixed a bug so httpd does not crash when stopped at the
               wrong time during TLS connection negotiation, or any
               other theoretically as slow connection setup.


  OTP-18694    Application(s): inets
               Related Id(s): GH-7482

               Enhance error handling and avoid that the HTTP client
               hangs on headers provided on the wrong format.


  OTP-18704    Application(s): inets
               Related Id(s): ERIERL-962, OTP-18688, PR-7513

               With this change, error report generated by httpd
               during connection setup contains socket type
               information.


  OTP-18708    Application(s): inets
               Related Id(s): ERIERL-962, OTP-18688

               Stop and restart of the httpd server in the Inets
               application has been refactored to a more synchronous
               and OTP supervisor friendly approach.

               This should increase stability and for example avoid a
               supervisor report from httpd_connection_sup about
               killed child process(es) in some cases when stopping or
               restarting httpd.


 Full runtime dependencies of inets-9.0.2: 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-5.0


 ---------------------------------------------------------------------
 --- kernel-9.1 ------------------------------------------------------
 ---------------------------------------------------------------------

 The kernel-9.1 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18623    Application(s): erts, kernel
               Related Id(s): GH-7344

               Fixed an issue with truncated crash slogans on failed
               emulator start.


  OTP-18628    Application(s): kernel
               Related Id(s): GH-7280

               Fix shell:start_interactive function specification.


  OTP-18654    Application(s): kernel
               Related Id(s): PR-7404

               Fix code:get_doc/1 to return missing, when it can't
               find erts instead of crashing.


  OTP-18669    Application(s): erts, kernel
               Related Id(s): OTP-18029

               Function socket:close/1 could cause a VM crash on
               Windows.


  OTP-18675    Application(s): kernel, stdlib
               Related Id(s): GH-7459, PR-7473

               Fix deadlock when erl.exe is used as part of a pipe on
               Windows and trying to set the encoding of the
               standard_io device.


  OTP-18676    Application(s): common_test, erl_docgen, erts, kernel,
               stdlib
               Related Id(s): GH-7459, PR-7473

               Expanded the documentation about how to use the
               standard_io, standard_error and user I/O devices.

               Added the types io:standard_io/0, io:standard:error/0
               and io:user/0.


  OTP-18677    Application(s): kernel
               Related Id(s): GH-7417, PR-7418

               Fix logger's overload protection mechanism to only
               fetch memory used by messages when needed.


  OTP-18685    Application(s): kernel

               Fixed a number of socket-related issues causing
               incompatibilities with gen_tcp and gen_udp
               respectively.


  OTP-18707    Application(s): kernel
               Related Id(s): #7530

               gen_tcp:connect with socket address and socket (inet-)
               backend fails because of missing callback function.


  OTP-18731    Application(s): kernel
               Related Id(s): GH-7577, PR-7578

               The DNS RR cache used by `inet_res` has been fixed to
               preserve insert order, which is beneficial when the DNS
               server returns RRs in some specific order for e.g load
               balancing purposes.


  OTP-18734    Application(s): kernel
               Related Id(s): GH-6461, GH-7569, OTP-18344, PR-6522

               The options `reuseport`, `reuseport_lb` and
               `exclusiveaddruse` were accidentally not allowed for
               e.g `gen_udp:open/1,2`, which has now been corrected.


  OTP-18747    Application(s): erts, kernel
               Related Id(s): GH-7605

               gen_udp:recv/* for Unix Domain Socket in binary mode
               and passive mode has been fixed to not crash.


  OTP-18757    Application(s): kernel
               Related Id(s): PR-7631

               Fixed issue where cursor would not be placed at the end
               of the expression when navigating shell history.


 --- Improvements and New Features ---

  OTP-18586    Application(s): erts, kernel
               Related Id(s): OTP-18029

               Update gen_tcp_socket and gen_udp_socket to handle
               'completion' (socket on Windows).


  OTP-18611    Application(s): erts, kernel
               Related Id(s): #5024, OTP-18029

               Add support for Unix Domain Sockets (only for STREAM
               sockets) on Windows for 'socket'.


  OTP-18660    Application(s): erts, kernel

               Add basic support for socket ioctl on Windows.


  OTP-18681    Application(s): kernel

               The file:location/0 type is now exported.


  OTP-18686    Application(s): erts, kernel

               Add support for (Windows) socket option
               exclusiveaddruse.


  OTP-18687    Application(s): erts, kernel

               [socket] Add support for the 'nopush' option.


  OTP-18693    Application(s): erts, kernel

               Add support for socket option 'BSP STATE'.


  OTP-18698    Application(s): erts, kernel

               Add tcp socket options 'keepcnt', 'keepidle' and
               'keepintvl'.


  OTP-18710    Application(s): erts, kernel

               Add support for misc (Windows) socket options
               ('max_msg_size' and 'maxdg').


  OTP-18754    Application(s): kernel, stdlib
               Related Id(s): PR-7604, PR-7647

               The keyboard shortcuts for the shell are now
               configurable.


  OTP-18755    Application(s): kernel
               Related Id(s): PR-7503

               Optimized code_server to reduce repeated work when
               loading the same module concurrently.


 Full runtime dependencies of kernel-9.1: crypto-5.0, erts-14.0,
 sasl-3.0, stdlib-5.0


 ---------------------------------------------------------------------
 --- megaco-4.5 ------------------------------------------------------
 ---------------------------------------------------------------------

 The megaco-4.5 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Improvements and New Features ---

  OTP-18599    Application(s): megaco
               Related Id(s): OTP-18029

               Make megaco transports handle gen_tcp | gen_udp with
               socket backend on Windows (completion).


 Full runtime dependencies of megaco-4.5: asn1-3.0, debugger-4.0,
 erts-12.0, et-1.5, kernel-8.0, runtime_tools-1.8.14, stdlib-2.5


 ---------------------------------------------------------------------
 --- mnesia-4.22.1 ---------------------------------------------------
 ---------------------------------------------------------------------

 The mnesia-4.22.1 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18711    Application(s): mnesia
               Related Id(s): ERIERL-963

               Do not delete old backup file if the new backup fails.


 Full runtime dependencies of mnesia-4.22.1: erts-9.0, kernel-5.3,
 stdlib-5.0


 ---------------------------------------------------------------------
 --- observer-2.15.1 -------------------------------------------------
 ---------------------------------------------------------------------

 The observer-2.15.1 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18722    Application(s): observer
               Related Id(s): PR-7462

               Closing the trace log window via the menu did not work.


 Full runtime dependencies of observer-2.15.1: erts-14.0, et-1.5,
 kernel-9.0, runtime_tools-1.19, stdlib-5.0, wx-2.3


 ---------------------------------------------------------------------
 --- public_key-1.14.1 -----------------------------------------------
 ---------------------------------------------------------------------

 The public_key-1.14.1 application can be applied independently of
 other applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18718    Application(s): public_key
               Related Id(s): GH-7546

               Country name comparison shall be case insensitive


  OTP-18723    Application(s): public_key
               Related Id(s): GH-6394

               Add check to disallow duplicate certs in a path


 Full runtime dependencies of public_key-1.14.1: asn1-3.0, crypto-4.6,
 erts-6.0, kernel-3.0, stdlib-3.5


 ---------------------------------------------------------------------
 --- snmp-5.15 -------------------------------------------------------
 ---------------------------------------------------------------------

 The snmp-5.15 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Improvements and New Features ---

  OTP-18598    Application(s): snmp
               Related Id(s): OTP-18029

               Make snmp handle gen_udp with socket backend on Windows
               (completion).


 Full runtime dependencies of snmp-5.15: crypto-4.6, erts-12.0,
 kernel-8.0, mnesia-4.12, runtime_tools-1.8.14, stdlib-5.0


 ---------------------------------------------------------------------
 --- ssl-11.0.3 ------------------------------------------------------
 ---------------------------------------------------------------------

 The ssl-11.0.3 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18697    Application(s): ssl
               Related Id(s): GH-7506

               Avoid function clause error in ssl:getopts/2 by
               handling that inet:getopts may return an empty list
               during some circumstances, such as the socket being in
               a closing state.


  OTP-18700    Application(s): ssl
               Related Id(s): GH-7507

               The API function `ssl:recv/3` has been tightened to
               disallow negative length, which has never been
               documented to work, but was passed through and caused
               strange errors.


  OTP-18712    Application(s): ssl
               Related Id(s): GH-7431

               When a client initiated renegotiation was rejected and
               the client socket was in active mode the expected error
               message to the controlling process was not sent.


 --- Improvements and New Features ---

  OTP-18631    Application(s): ssl

               Add some guidance for signature algorithms
               configuration in ssl applications users guide.


 Full runtime dependencies of ssl-11.0.3: crypto-5.0, erts-14.0,
 inets-5.10.7, kernel-9.0, public_key-1.11.3, runtime_tools-1.15.1,
 stdlib-4.1


 ---------------------------------------------------------------------
 --- stdlib-5.1 ------------------------------------------------------
 ---------------------------------------------------------------------

 The stdlib-5.1 application can be applied independently of other
 applications on a full OTP 26 installation.

 --- Fixed Bugs and Malfunctions ---

  OTP-18605    Application(s): compiler, stdlib
               Related Id(s): GH-7298, GH-7317

               The compiler could run forever when compiling a call to
               is_record/3 with a huge positive tuple size. The call
               is_record(A, a, 0) would crash the compiler when used
               in a function body. When used in a guard the compiler
               would emit incorrect code that would accept {a> as a
               record.


  OTP-18614    Application(s): stdlib
               Related Id(s): GH-7162, PR-7237

               Fix bug in ets:tab2file that could make it fail if
               another Erlang process created the same file at the
               same time.


  OTP-18616    Application(s): stdlib
               Related Id(s): GH-7258

               An {else_clause,Value} exception will now be reported
               nicely in the shell.


  OTP-18627    Application(s): stdlib
               Related Id(s): PR-7072

               Correct return value for error case, so that it matches
               the documented and intended return value {error,
               {already_started, pid()} when local registered names
               are used.


  OTP-18633    Application(s): stdlib

               sys:get_state/1,2 and sys:replace_state/2,3 has been
               corrected to handle a state named error as a state
               name, not as a failed system callback.

               For the standard server behaviours this was an issue
               only for gen_statem (and gen_fsm) when the state name
               was error, and for gen_server if the complete state was
               {error,_}.


  OTP-18655    Application(s): stdlib
               Related Id(s): GH-6460, PR-7208

               Multiple problems were fixed in
               filelib:safe_relative_path/2. If its second argument
               was a path that contained symbolic links, an incorrect
               result patch could be returned. Also, paths were
               sometimes falsely considered unsafe.


  OTP-18675    Application(s): kernel, stdlib
               Related Id(s): GH-7459, PR-7473

               Fix deadlock when erl.exe is used as part of a pipe on
               Windows and trying to set the encoding of the
               standard_io device.


  OTP-18676    Application(s): common_test, erl_docgen, erts, kernel,
               stdlib
               Related Id(s): GH-7459, PR-7473

               Expanded the documentation about how to use the
               standard_io, standard_error and user I/O devices.

               Added the types io:standard_io/0, io:standard:error/0
               and io:user/0.


  OTP-18683    Application(s): stdlib
               Related Id(s): PR-7502

               Fix h/2,3 to properly render multi-clause
               documentation.


  OTP-18759    Application(s): stdlib
               Related Id(s): GH-7606

               Timers created by timer:apply_after/4,
               apply_interval/4, and apply_repeatedly/4 would silently
               fail to do the apply if it was not possible to spawn a
               process when the timer expired. This has now been
               corrected, and if the spawn fails, the system will be
               taken down producing a crash dump.


  OTP-18763    Application(s): stdlib
               Related Id(s): GH-7655

               When an Erlang source file lacked a module definition,
               there would be a spurious "module name must not be
               empty" diagnostic for each spec in the file.


 --- Improvements and New Features ---

  OTP-18679    Application(s): stdlib
               Related Id(s): ERIERL-965

               The argument descriptions for option types in argparse
               have been made less ambiguous.


  OTP-18690    Application(s): stdlib
               Related Id(s): GH-7510, PR-7511

               Clarified the documentation of normal shutdown reason
               on gen_server:call/2,3


  OTP-18696    Application(s): stdlib

               *** POTENTIAL INCOMPATIBILITY ***

               Pattern matching and equivalence (=:=, =/=) comparisons
               on 0.0 will now raise a warning, as it will no longer
               be considered equivalent to -0.0 in OTP 27.

               If a match on 0.0 specifically is desired (distinct
               from -0.0), the warning can be suppressed by writing
               +0.0 instead.

               The arithmetic comparison operators are unaffected,
               including arithmetic equality (==).


  OTP-18705    Application(s): stdlib
               Related Id(s): GH-6339, GH-7524, OTP-18471, PR-6843

               The semantics of the gen_{server,statem,event}
               behaviour's synchronous start behaviour introduced in
               OTP-26.0 with OTP-18471, has been clarified in the
               documentation.


  OTP-18736    Application(s): stdlib
               Related Id(s): PR-7564

               Added functionality to set a custom multiline prompt.


  OTP-18746    Application(s): stdlib
               Related Id(s): PR-7313, PR-7456

               *** HIGHLIGHT ***

               *** POTENTIAL INCOMPATIBILITY ***

               A warning for (accidental use of) Triple-Quoted Strings
               has been implemented as per EEP 64.


  OTP-18754    Application(s): kernel, stdlib
               Related Id(s): PR-7604, PR-7647

               The keyboard shortcuts for the shell are now
               configurable.


 Full runtime dependencies of stdlib-5.1: compiler-5.0, crypto-4.5,
 erts-13.1, kernel-9.0, sasl-3.0


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