PHP Client Hangs Apache: Any Ideas?

[Greg Grothaus]

I tried using memcached across two servers using the PHP client.  After 
running the servers for a few hours, the number of apache processes had 
grown to the maximum number on the server and were requests were being 
dropped.  The apache processes simply weren't terminating.  I can't 
"prove" that it was memcached as the issue, but I've repeated this 
experiment a number of times with and without memcached.  With 
memcached, apache processes grow and never complete, without memcached 
there is no problem.

Any idea as to what might be happenning here?
-Greg