When performing a reconfig after updating the locks being used to include a new lock the following was the output into the log file and onto the screen.
locks changed from [(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'serverbuilds'),
(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'machine3_serverbuilds'),
(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'machine3')] to
[(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'serverbuilds'),
(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'machine3')]
It should read
locks changed from [(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'serverbuilds'),
(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'machine3')] to
[(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'serverbuilds'),
(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'machine3_serverbuilds'),
(<class buildbot.locks.MasterLock at 0x2000000000fed350>, 'machine3')]
Since I was adding the new lock machine3_serverbuilds, not removing it.