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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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FAILED IN DEACTIVATE_DDL_LOG_ENTRY deallocate_ddl_log_entry() can be called without having locked LOCK_gdl. It uses a global buffer for reading and writing entries in the ddl_log, and since it is not protected by any mutex, two concurrent threads can overwrite the content in the global buffer, so it can be different from what was read. Thread a reads from entry 1 into global buffer, thread b reads from entry 2 into global buffer, thread a writes from global buffer into entry 1 -> entry 1 is not the content of entry 2. This is especially bad for replace entries, which uses two phases, and does not deactivate the whole entry after the first phase, but increases the phase instead. Fixed by using thread local storage (stack) instead of global storage (global buffer). Also added buffer and size arguments to read/write_ddl_log_file_entry. Also only read/write first bytes in entries in deactivate_ddl_log_entry. Also fixed the scenario where it will try to recover from a server compiled with a different value of IO_SIZE (very uncommon!) updated patch with set_ddl_log_entry_from_buf and removed read_ddl_log_entry. Manually tested, no test case included. |
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MySQL Server 5.1 This is a release of MySQL, a dual-license SQL database server. For the avoidance of doubt, this particular copy of the software is released under the version 2 of the GNU General Public License. MySQL is brought to you by Oracle. Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. License information can be found in the COPYING file. MySQL FOSS License Exception We want free and open source software applications under certain licenses to be able to use specified GPL-licensed MySQL client libraries despite the fact that not all such FOSS licenses are compatible with version 2 of the GNU General Public License. Therefore there are special exceptions to the terms and conditions of the GPLv2 as applied to these client libraries, which are identified and described in more detail in the FOSS License Exception at <http://www.mysql.com/about/legal/licensing/foss-exception.html>. This distribution may include materials developed by third parties. For license and attribution notices for these materials, please refer to the documentation that accompanies this distribution (see the "Licenses for Third-Party Components" appendix) or view the online documentation at <http://dev.mysql.com/doc/>. GPLv2 Disclaimer For the avoidance of doubt, except that if any license choice other than GPL or LGPL is available it will apply instead, Oracle elects to use only the General Public License version 2 (GPLv2) at this time for any software where a choice of GPL license versions is made available with the language indicating that GPLv2 or any later version may be used, or where a choice of which version of the GPL is applied is otherwise unspecified. For further information about MySQL or additional documentation, see: - The latest information about MySQL: http://www.mysql.com - The current MySQL documentation: http://dev.mysql.com/doc Some Reference Manual sections of special interest: - If you are migrating from an older version of MySQL, please read the "Upgrading from..." section. - To see what MySQL can do, take a look at the features section. - For installation instructions, see the Installing and Upgrading chapter. - For the new features/bugfix history, see the MySQL Change History appendix. You can browse the MySQL Reference Manual online or download it in any of several formats at the URL given earlier in this file. Source distributions include a local copy of the manual in the Docs directory.