leak on graceful restarts

[Paul Querna]

Looking at a problem that seems easy to re-produce using un-patched 
trunk, 2.2.10 and 2.0.63.

Using a graceful restart causes higher memory usage in the parent, which 
is then passed on to the 'new' children processes.

The issue seems to appear in all the Worker, Event and Prefork MPMs.

Compile up httpd without apr pool debugging enabled, start it as normal, 
 and then check the memory usage:

$ ./apachectl start
$ ps alx | grep 18459
1  1000 18459     1  20   0 152752  2672 674009 Ss   ?          0:00 
/home/chip/temp/httpd/bin/httpd -k start

$ ./apachectl graceful
$ ps alx | grep 18459
1  1000 18459     1  20   0 152752  3192 674009 Ss   ?          0:00 
/home/chip/temp/httpd/bin/httpd -k start

$ ./apachectl graceful
$ ps alx | grep 18459
1  1000 18459     1  20   0 152752  3236 674009 Ss   ?          0:00 
/home/chip/temp/httpd/bin/httpd -k start

$ ./apachectl graceful
$ ps alx | grep 18459
1  1000 18459     1  20   0 152752  3280 674009 Ss   ?          0:00 
/home/chip/temp/httpd/bin/httpd -k start

(2672 -> 3192 -> 3236 -> 3280)

And, at least over here, httpd consistently grows in RSS, without any 
obvious cause.

Seems reproducible on Ubuntu and Darwin, using 2.2.10, 2.0.63 and trunk.

Any ideas?

Thanks,

Paul