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MySQL 5.6 Release Notes  /  Changes in MySQL 5.6.41 (2018-07-27, General Availability)

Changes in MySQL 5.6.41 (2018-07-27, General Availability)

Security Notes

  • The linked OpenSSL library for the MySQL Commercial Server has been updated to version 1.0.2o. Issues fixed in the new OpenSSL version are described at

    This change does not affect the Oracle-produced MySQL Community build of MySQL Server, which uses the yaSSL library instead. (Bug #28025379)

Functionality Added or Changed

  • Previously, for the --ssl-verify-server-cert option, the client checked whether the host name that it used for connecting matched the Common Name value in the certificate but not the Subject Alternative Name value. Now, if MySQL was built using OpenSSL 1.0.2 or higher, the client checks whether the host name matches either the Subject Alternative Name value or the Common Name value in the server certificate. Host name identity verification also works with certificates that specify the Common Name using wildcards. Thanks to DaniĆ«l van Eeden for a patch on which this change was based. (Bug #16211011, Bug #68052, Bug #27511233, Bug #89578)

Bugs Fixed

  • InnoDB: A schema mismatch error reported during an import tablespace operation failed to print mismatched table flags in a readable format. (Bug #27542720)

  • InnoDB: A DDL operation failed to wait for a FULLTEXT index optimization operation to finish. (Bug #27326796)

    References: This issue is a regression of: Bug #24938374.

  • InnoDB: A failing assertion occurred after initiating a memcached get operation. (Bug #26876594)

  • InnoDB: A corrupt index ID encountered during a foreign key check raised an assertion. (Bug #26654685)

  • Replication: When a transaction larger than the binary log transaction cache size (binlog_cache_size) was flushed to a temporary file during processing, and the flush failed due to a lack of space in the temporary directory, the flush error was not handled correctly. No message was written to the error log, and the binary log cache was not cleared after the transaction was rolled back. Now, in this situation, the server takes an appropriate action based on the binlog_error_action setting (shut down the server or halt logging), and writes a message to the error log. When the transaction is rolled back, the server checks for flush errors and clears the binary log cache if any occurred. (Bug #27399620, Bug #89272)

  • Replication: When GTIDs are in use for replication, replicated transactions that are filtered out on the slave are persisted. If binary logging is enabled on the slave, the filtered-out transaction is written to the binary log as a Gtid_log_event followed by an empty transaction containing only BEGIN and COMMIT statements. If binary logging is disabled, the GTID of the filtered-out transaction is written to the mysql.gtid_executed table. This process ensures that there are no gaps in the set of executed GTIDs, and that the filtered-out transactions are not retrieved again if the slave reconnects to the master. Previously, this process was not done for CREATE DATABASE, ALTER DATABASE, and DROP DATABASE statements, but it is now carried out for those statements as well as for others. (Bug #27308751, Bug #88891)

  • Replication: On a multithreaded slave, when a STOP SLAVE statement is executed on the slave, followed by a START SLAVE statement, the error log can report a different position in the binary log for the slave SQL thread when exiting, compared to the position reported for the slave SQL thread at the subsequent initialization.

    For a multithreaded slave, the position reported for the SQL thread on exit is a low water mark, up to which the replication stream is consistent and has no gaps. Transactions appearing before the position are guaranteed to have committed, but transactions after the position may have committed or not. However, this low water mark was being reported before the process to stop the worker threads was actually carried out, and the low water mark was subsequently updated by a checkpoint routine during that process. The timing of the log message has now been changed so that the final low water mark is reported as the position for the SQL thread on exit. (Bug #27300658)

  • A heap overflow vulnerability in the MySQL client library was fixed. (Bug #27980823)

  • An unencrypted connection could result from a client connection attempt specifying that an encrypted connection was required, if the server was not configured to support SSL. (Bug #27759871)

  • On Windows, if the Visual C++ Redistributable for Visual Studio had been removed, MySQL uninstallation using the MSI installer failed. (Bug #27621546)

  • A memory leak in the pfs-t unit test was fixed. Thanks to Yura Sorokin for the patch. (Bug #27440735, Bug #89384)

  • With automatic_sp_privileges enabled, the EXECUTE and ALTER ROUTINE privileges were not correctly granted to routine creators. (Bug #27407480)

  • Mishandling of internal privilege structures could cause a server exit. (Bug #27230925)

  • The UNION of a user-defined variable and a DECIMAL column produced an incorrect result when using a UTF8 character set. (Bug #27197235)

  • mysqldump exited abnormally for large --where option values. (Bug #26171967, Bug #86496, Bug #27510150)

  • For MyISAM tables, particular sequences of INSERT and DELETE statements could cause table corruption. (Bug #25541037)

  • FORCE INDEX had no effect on a query that used GROUP BY, ORDER BY, and LIMIT together. (Bug #90817, Bug #27998526)