What does this mean?

[Matthew Dillon]

:>From the output of dmesg:
:
:[diagnostic] cache_lock: blocked on 0xe21a59f8 "sendmail"
:[diagnostic] cache_lock: blocked on 0xe21a59f8 "sendmail"
:[diagnostic] cache_lock: unblocked sendmail
:[diagnostic] cache_lock: unblocked sendmail
:
:If this is innocuous is it possible to remove these diagnostic
:messages? 
:------
:Dave Hayes - Consultant - Altadena CA, USA - dave at jetcafe.org 

    You can ignore it.  It's an old diagnostic printf.

					-Matt