Database error

From Document Freedom Day

A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:

DELETE FROM `mw_objectcache` WHERE keyname='dfd_main-mw_:messages:en:status'

from within function "MediaWikiBagOStuff::_doquery". MySQL returned error "1213: Deadlock found when trying to get lock; try restarting transaction (localhost)".