```
Patch Package:           OTP 28.1.1
Git Tag:                 OTP-28.1.1
Date:                    2025-10-20
Trouble Report Id:       OTP-19768, OTP-19771, OTP-19774, OTP-19780,
                         OTP-19790, OTP-19791, OTP-19792, OTP-19796,
                         OTP-19799, OTP-19806
Seq num:                 ERERL-1261, ERIERL-1251, ERIERL-1264,
                         GH-10150, GH-10191, GH-10212, GH-10217,
                         PR-10182, PR-10194, PR-10201, PR-10221,
                         PR-10241, PR-10245, PR-10248, PR-10249,
                         PR-10274, PR-9970
System:                  OTP
Release:                 28
Application:             diameter-2.5.2, erts-16.1.1, kernel-10.4.1,
                         ssl-11.4.1, xmerl-2.1.7
Predecessor:             OTP 28.1
```

Check out the git tag OTP-28.1.1, 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.

# OTP-28.1.1

## Improvements and New Features

- When building OTP, some applications may be skipped due to lacking
  dependencies, or due to user choice. Such skipped applications are excluded
  from the docs build step and a placeholder page is displayed in their stead.

  Own Id: OTP-19771  
  Related Id(s): ERIERL-1251, [PR-10194]

# diameter-2.5.2

The diameter-2.5.2 application can be applied independently of other
applications on a full OTP 28 installation.

## Fixed Bugs and Malfunctions

- Added documentation about 'proxy' and 'resend' options in
  diameter:handle_request/3

  Own Id: OTP-19768  
  Related Id(s): [GH-10150], [PR-10182]

> #### Full runtime dependencies of diameter-2.5.2
>
> erts-10.0, kernel-3.2, ssl-9.0, stdlib-5.0

# erts-16.1.1

The erts-16.1.1 application can be applied independently of other applications
on a full OTP 28 installation.

## Fixed Bugs and Malfunctions

- Fixed the `erl` documentation of the default timewarp mode used.

  Own Id: OTP-19790  
  Related Id(s): [PR-9970]

- The `erlang:suspend_process()` BIFs failed to suspend processes currently
  executing on dirty schedulers.

  Own Id: OTP-19799  
  Related Id(s): [PR-10241]

> #### Full runtime dependencies of erts-16.1.1
>
> kernel-9.0, sasl-3.3, stdlib-4.1

# kernel-10.4.1

The kernel-10.4.1 application can be applied independently of other applications
on a full OTP 28 installation.

## Fixed Bugs and Malfunctions

- With this change group.erl will not crash when receiving unknown message.

  Own Id: OTP-19796  
  Related Id(s): ERIERL-1264, [PR-10248]

> #### Full runtime dependencies of kernel-10.4.1
>
> crypto-5.0, erts-15.2.5, sasl-3.0, stdlib-6.0

# ssl-11.4.1

Note! The ssl-11.4.1 application _cannot_ be applied independently of other
applications on an arbitrary OTP 28 installation.

       On a full OTP 28 installation, also the following runtime
       dependencies have to be satisfied:
       -- crypto-5.7 (first satisfied in OTP 28.1)
       -- public_key-1.18.3 (first satisfied in OTP 28.1)

## Fixed Bugs and Malfunctions

- Fixed so that sending of application data will adhere to max_fragment_length.
  This was broken in OTP-27 release by an optimization.

  Own Id: OTP-19774  
  Related Id(s): [GH-10191], [PR-10201]

- PR-10046 put to hard requirements on key file content. Make sure same file can
  be used as keyfile and certfile

  Own Id: OTP-19780  
  Related Id(s): [GH-10212], [GH-10217], [PR-10221]

- Assert that hello extensions are unique and send an illegal parameter alert if
  they are not.

  Own Id: OTP-19791  
  Related Id(s): [PR-10245]

- Avoid sending an internal message to the user process in conjunction with
  handling a key update.

  Own Id: OTP-19806  
  Related Id(s): [PR-10274]

> #### Full runtime dependencies of ssl-11.4.1
>
> crypto-5.7, erts-16.0, inets-5.10.7, kernel-10.3, public_key-1.18.3,
> runtime_tools-1.15.1, stdlib-7.0

# xmerl-2.1.7

The xmerl-2.1.7 application can be applied independently of other applications
on a full OTP 28 installation.

## Fixed Bugs and Malfunctions

- The XSD validation failed due to not handling the optional text blocks
  correctly in an XSD complex type with attribute `mixed=true`.

  Own Id: OTP-19792  
  Related Id(s): [PR-10249], ERERL-1261

> #### Full runtime dependencies of xmerl-2.1.7
>
> erts-6.0, kernel-8.4, stdlib-2.5

# Thanks to

Daniel Gorin, Dmytro Lytovchenko, Jean-Philippe Jodoin

[GH-10150]: https://github.com/erlang/otp/issues/10150
[GH-10191]: https://github.com/erlang/otp/issues/10191
[GH-10212]: https://github.com/erlang/otp/issues/10212
[GH-10217]: https://github.com/erlang/otp/issues/10217
[PR-10182]: https://github.com/erlang/otp/pull/10182
[PR-10194]: https://github.com/erlang/otp/pull/10194
[PR-10201]: https://github.com/erlang/otp/pull/10201
[PR-10221]: https://github.com/erlang/otp/pull/10221
[PR-10241]: https://github.com/erlang/otp/pull/10241
[PR-10245]: https://github.com/erlang/otp/pull/10245
[PR-10248]: https://github.com/erlang/otp/pull/10248
[PR-10249]: https://github.com/erlang/otp/pull/10249
[PR-10274]: https://github.com/erlang/otp/pull/10274
[PR-9970]: https://github.com/erlang/otp/pull/9970