[mistwang]

Mysql connection was not closed before ruby process forked, so if one process close the connection, the other processes will get the error.

To verify this, you can "lsof -p <pid_of_ruby_process>", check the mysql unix socket, all of them must be referencing to the same one, and the parent ruby process should not have it opened.

In lsws/fcgi-bin/RailsRunner.rb, we have code tries to close MySQL connections after initialization

ActiveRecord::Base.clear_active_connections! if defined?(ActiveRecord::Base)

Seems it works for one version of Rails, then stop working for another. If you can figure out the right way to close MySQL DB connection, we will update RailsRunner.rb