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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.

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Marko Mäkelä 138c11cce5 MDEV-22790 Race between btr_page_mtr_lock() dropping AHI on the same block This race condition was introduced by commit `ad6171b91c` (MDEV-22456). In the observed case, two threads were executing btr_search_drop_page_hash_index() on the same block, to free a stale entry that was attached to a dropped index. Both threads were holding an S latch on the block. We must prevent the double-free of block->index by holding block->lock in exclusive mode. btr_search_guess_on_hash(): Do not invoke btr_search_drop_page_hash_index(block) to get rid of stale entries, because we are not necessarily holding an exclusive block->lock here. buf_defer_drop_ahi(): New function, to safely drop stale entries in buf_page_mtr_lock(). We will skip the call to btr_search_drop_page_hash_index(block) when only requesting bufferfixing (no page latch), because in that case, we should not be accessing the adaptive hash index, and we might get a deadlock if we acquired the page latch.		2020-06-05 15:22:46 +03:00
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README.md

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MariaDB: drop-in replacement for MySQL

MariaDB is designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.

MariaDB is brought to you by the MariaDB Foundation. Please read the CREDITS file for details about the MariaDB Foundation, and who is developing MariaDB.

MariaDB is developed by many of the original developers of MySQL who now work for the MariaDB Foundation and the MariaDB Corporation, and by many people in the community.

MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also run 'SHOW authors' to get a list of active contributors.

A description of the MariaDB project and a manual can be found at:

https://mariadb.org/

https://mariadb.com/kb/en/

https://mariadb.com/kb/en/mariadb-vs-mysql-features/

https://mariadb.com/kb/en/mariadb-versus-mysql-features/

https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/

As MariaDB is a full replacement of MySQL, the MySQL manual at http://dev.mysql.com/doc is generally applicable.

Help:

More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss and the #maria IRC channel on Freenode.

Licensing:

NOTE:

MariaDB is specifically available only under version 2 of the GNU General Public License (GPLv2). (I.e. Without the "any later version" clause.) This is inherited from MySQL. Please see the README file in the MySQL distribution for more information.

License information can be found in the COPYING file. Third party license information can be found in the THIRDPARTY file.

Bug Reports:

Bug and/or error reports regarding MariaDB should be submitted at: https://jira.mariadb.org

For reporting security vulnerabilities see: https://mariadb.org/about/security-policy/

Bugs in the MySQL code can also be submitted at: https://bugs.mysql.com

The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server

Code status:

travis-ci.org (10.2 branch)