> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/release-notes/community-server/old-releases/10.1/10.1.42.md).

# MariaDB 10.1.42 Release Notes

The most recent release of [MariaDB 10.1](/docs/release-notes/community-server/old-releases/10.1/changes-improvements-in-mariadb-10-1.md) is:[**MariaDB 10.1.48**](/docs/release-notes/community-server/old-releases/10.1/10.1.48.md) Stable (GA) [Download Now](https://downloads.mariadb.org/mariadb/10.1.48/)

After an upgrade MariaDB Server can crash if InnoDB tables exist with a `FULLTEXT INDEX` and a `FOREIGN KEY` constraint attached to them. We got reports that the crash already will be encountered on startup, but a crash is also possible at a later stage. See [MDEV-20987](https://jira.mariadb.org/browse/MDEV-20987) for more details.**Do not download or use this release.**

[Download](https://mariadb.com/downloads/) | [Release Notes](/docs/release-notes/community-server/old-releases/10.1/10.1.42.md) | [Changelog](/docs/release-notes/community-server/changelogs/changelogs-mariadb-101-series/mariadb-10142-changelog.md) | [Overview of 10.1](/docs/release-notes/community-server/old-releases/10.1/changes-improvements-in-mariadb-10-1.md)

[*Alternate download from mariadb.org*](https://downloads.mariadb.org/mariadb/10.1.42/)

**Release date:** 5 Nov 2019

[MariaDB 10.1](/docs/release-notes/community-server/old-releases/10.1/changes-improvements-in-mariadb-10-1.md) is a previous stable series of MariaDB. It is an evolution of [MariaDB 10.0](/docs/release-notes/community-server/old-releases/10.0/changes-improvements-in-mariadb-10-0.md) with several entirely new features not found anywhere else and with backported and reimplemented features from MySQL 5.6 and 5.7.

[MariaDB 10.1.42](/docs/release-notes/community-server/old-releases/10.1/10.1.42.md) is a [***Stable (GA)***](/docs/release-notes/community-server/about/release-criteria.md) release.

**For an overview of** [**MariaDB 10.1**](/docs/release-notes/community-server/old-releases/10.1/changes-improvements-in-mariadb-10-1.md) **see the**[**What is MariaDB 10.1?**](/docs/release-notes/community-server/old-releases/10.1/changes-improvements-in-mariadb-10-1.md) **page.**

Thanks, and enjoy MariaDB!

## Notable Changes

* [MDEV-17638](https://jira.mariadb.org/browse/MDEV-17638): Improved `innochecksum` error messages
* [MDEV-20247](https://jira.mariadb.org/browse/MDEV-20247): Replication hangs with "`preparing`" and never starts
* FULLTEXT INDEX:
  * [MDEV-19647](https://jira.mariadb.org/browse/MDEV-19647): Server hangs after dropping full text indexes and restart
  * [MDEV-19529](https://jira.mariadb.org/browse/MDEV-19529): InnoDB hang on `DROP FULLTEXT INDEX`
  * [MDEV-19073](https://jira.mariadb.org/browse/MDEV-19073): FTS row mismatch after crash recovery
  * [MDEV-20621](https://jira.mariadb.org/browse/MDEV-20621): FULLTEXT INDEX activity causes InnoDB hang
* [MDEV-20927](https://jira.mariadb.org/browse/MDEV-20927): Duplicate key with auto increment
* [MDEV-19376](https://jira.mariadb.org/browse/MDEV-19376): Repl\_semi\_sync\_master::commit\_trx assertion
* [Galera wsrep library](/docs/galera-cluster/readme/mariadb-galera-cluster-guide.md) updated to 25.3.28
* Fixes for the following [security vulnerabilities](/docs/server/security/cve.md):
  * [CVE-2019-2974](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-2974)
  * [CVE-2020-2780](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-2780)
  * [CVE-2021-2144](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-2144)

## Changelog

For a complete list of changes made in [MariaDB 10.1.42](/docs/release-notes/community-server/old-releases/10.1/10.1.42.md), with links to detailed information on each push, see the [changelog](/docs/release-notes/community-server/changelogs/changelogs-mariadb-101-series/mariadb-10142-changelog.md).

## Contributors

For a full list of contributors to [MariaDB 10.1.42](/docs/release-notes/community-server/old-releases/10.1/10.1.42.md), see the [MariaDB Foundation release announcement](https://mariadb.org/mariadb-10-4-9-10-3-19-and-10-2-28-10-1-42-and-5-5-66-now-available/).

A file format compatibility bug that was introduced in [MariaDB 10.1.0](/docs/release-notes/community-server/old-releases/10.1/10.1.0.md) was fixed in [MariaDB 10.1.21](/docs/release-notes/community-server/old-releases/10.1/10.1.21.md).\
Using [page\_compression](/docs/server/server-usage/storage-engines/innodb/innodb-page-compression.md) or non-default [innodb\_page\_size](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md) created files that were incompatible with [MariaDB 10.0](/docs/release-notes/community-server/old-releases/10.0/changes-improvements-in-mariadb-10-0.md) or MySQL 5.6. [MariaDB 10.1.21](/docs/release-notes/community-server/old-releases/10.1/10.1.21.md) and higher will convert affected files from earlier [MariaDB 10.1](/docs/release-notes/community-server/old-releases/10.1/changes-improvements-in-mariadb-10-1.md) releases to a compatible format.**This prevents a downgrade to earlier** [**MariaDB 10.1**](/docs/release-notes/community-server/old-releases/10.1/changes-improvements-in-mariadb-10-1.md) **versions.**[See the commit for details.](https://github.com/MariaDB/server/commit/ab1e6fefd869242d962cb91a006f37bb9ad534a7)

{% hint style="info" %}
Be notified of new MariaDB Server releases automatically by [subscribing](https://lists.mariadb.org/postorius/lists/announce.lists.mariadb.org/) to the MariaDB Foundation community announce 'at' lists.mariadb.org announcement list (this is a low traffic, announce-only list). MariaDB plc customers will be notified for all new releases, security issues and critical bug fixes for all MariaDB plc products thanks to the Notification Services.

MariaDB may already be included in your favorite OS distribution. More information can be found on the [Distributions which Include MariaDB](/docs/general-resources/distributions-including-mariadb.md) page.
{% endhint %}

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