trying to delete project: JDO error

[Lustig, Marc (Allianz Deutschland, externer Mitarbeiter)]

We are trying to delete a project by pressing the 'delete' button in the 
project group overview.
It takes about 2 minutes and then the following message is displayed:
 
javax.jdo.JDODataStoreException: Update request failed: UPDATE `BUILDRESULT` 
SET `BUILD_DEFINITION_ID_OID`=?, `BUILD_NUMBER`=?, `END_TIME`=?, `ERROR`=?, 
`EXIT_CODE`=?, `MODEL_ENCODING`=?, `PROJECT_ID_OID`=?, `START_TIME`=?, 
`RESULTSTATE`=?, `SUCCESS`=?, `RESULTTRIGGER`=? WHERE `ID`=? NestedThrowables: 
com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock 
found when trying to get lock; try restarting transaction
 
is it a known bug?