Based on MySQL 5.1.70, this release will include all the bug fixes in it. All of Percona‘s software is open-source and free, all the details of the release can be found in the 5.1.70-14.8 milestone at Launchpad.
Prevented a race condition that could lead to a server crash when querying the INFORMATION_SCHEMA.INNODB_BUFFER_PAGE table. Bug fixed #1072573.
When an upgrade was performed between major versions (e.g. by uninstalling a 5.1 RPM and then installing a 5.5 one), mysql_install_db was still called on the existing data directory which lead to re-creation of the test database. Bug fixed #1169522.
Fixed the upstream bug #68354 that could cause server to crash when performing update or join on Federated and MyISAM tables with one row, due to a bug in the Federated storage engine. Bug fixed #1182572.
Other bug fixes: bug fixed #1191395.