Comments - MariaDB 5.2.13 Release Notes
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Just tried installing 5.2.13 118 build on fresh CentOS 6.3 and seems mysql system tables incorrectly set user/group permissions to root instead of mysql preventing mysql server from starting. Changing to mysql user/group allowed mysql to start up.
we don't build 5.2 rpms for CentOS 6. Did you use CentOS5 builds? 32-bit or 64-bit ?
I've just tried to install CentOS 5 64-bit MariaDB 5.2.13-118 RPMs on CentOS 6 and all table files were owned by the mysql user, not root.