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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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The problem from a user's perspective: user creates table A, and then tries to CREATE TABLE a SELECT from A - and this causes a deadlock error, a hang, or fails with a debug assert, but only if the storage engine is InnoDB. The origin of the problem: InnoDB uses case-insensitive collation (system_charset_info) when looking up the internal table share, thus returning the same share for 'a' and 'A'. Cause of the user-visible behavior: since the same share is returned to SQL locking subsystem, it assumes that the same table is first locked (within the same session) for WRITE, and then for READ, and returns a deadlock error. However, the code is wrong in not properly cleaning up upon an error, leaving external locks in place, which leads to assertion failures and hangs. Fix that has been implemented: the SQL layer should properly propagate the deadlock error, cleaning up and freeing all resources. Further work towards a more complete solution: InnoDB should not use case insensitive collation for table share hash if table names on disk honor the case. mysql-test/r/innodb-deadlock.result: Bug#25164 test case result mysql-test/t/innodb-deadlock.test: Bug#25164 test case. The CREATE TABLE may fail depending on the character set of the system and filesystem, but it should never hang. sql/lock.cc: Unlock the storage engine "external" table level locks, if the MySQL thr_lock locking subsystem detects a deadlock error. |
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| extra | ||
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| libmysql | ||
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| man | ||
| myisam | ||
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| mysql-test | ||
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| ndb | ||
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| pstack | ||
| regex | ||
| scripts | ||
| server-tools | ||
| sql | ||
| sql-bench | ||
| sql-common | ||
| SSL | ||
| strings | ||
| support-files | ||
| tests | ||
| tools | ||
| VC++Files | ||
| vio | ||
| win | ||
| zlib | ||
| .bzrignore | ||
| .cvsignore | ||
| CMakeLists.txt | ||
| configure.in | ||
| COPYING | ||
| EXCEPTIONS-CLIENT | ||
| Makefile.am | ||
| README | ||
This is a release of MySQL, a dual-license SQL database server. MySQL is brought to you by the MySQL team at MySQL AB. License information can be found in these files: - For GPL (free) distributions, see the COPYING file and the EXCEPTIONS-CLIENT file. - For commercial distributions, see the LICENSE.mysql file. 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 manual sections of special interest: - If you are migrating from an older version of MySQL, please read the "Upgrading from..." section first! - 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 Change History appendix. - For the currently known bugs/misfeatures (known errors) see the Problems and Common Errors appendix. - For a list of developers and other contributors, see the Credits appendix. A local copy of the MySQL Reference Manual can be found in the Docs directory in GNU Info format. You can also browse the manual online or download it in any of several formats at the URL given earlier in this file. ************************************************************ IMPORTANT: Bug or error reports should be sent to http://bugs.mysql.com.