Apache crashing - lockf status

[Rafael Hasson <rafaelhasson@xxxxxxxxx>]

Hello all!

I've a webserver running PHP 5.2.17, Apache 2.2.17 and MySQL 5.5.13. 
Tables' storage engine are MyISAM. I'm having a problem with all httpd processes locking during peak hours.
Today while investigating the problem, I could replicate the it (all httpd processes locking) while running a 2.2 seconds select statement.
Does someone have a clue why a table locked for 2.2seconds is making all httpd processes goes to lockf state?
On my understanding only MySQL should be on hold until statement completes, not httpd.

After httpd goes to lockf, it never returns, I have to kill it and start again.
This is how top lock then http://pastebin.com/uG7ZjD7A

Appreciate some help =)

Thanks in advance
-- 
Rafael Hasson
Computer Engineer
Cel: + 55-41-99918090