The value taken to be shown in SHOW PROCESSLIST is not
initialized when THD is created and will be random for
unauthenticated connections.
  
To the documentor: Random value, instead of NULL, was shown,
in SHOW PROCESSLIST for still non-authenticated connections.


sql/sql_class.cc:
  Initialize time_after_lock.
  It is used from SHOW PROCESSLIST's code. If not initialized
  random value is shown for connected but still unauthenticated
  clients in the column Time.