"Add a comment why data modifying SQL statements MUST always use a locking read in tables that they read: otherwise the execution is not serializable, and in many cases is not well-defined; we also merged the associated bug fix from 4.1"


sql/ha_innodb.cc:
  Add a comment why data modifying SQL statements MUST always use a locking read in tables that they read: otherwise the exxecution is not serializable, and in many cases is not well-defined; 5 minutes ago we merged the associated bug fix from 4.0 and 4.1