What is "httpd in free ()"?

found in error logs

[bluesmandeluxe]

I've been seeing this in my raw error logs lately:

Following many lines of actual html code, generated (it seems) by phpmyadmin, I get thousands of lines of this:

"httpd in free(): warning: page is already free"
"httpd in free(): warning: chunk is already free"

Then that is followed by this:

"<b>Fatal error</b>: Maximum execution time of 30 seconds exceeded in <b>Unknown</b> on line <b>0</b><br>
[Tue Jan 9 13:13:30 2007] [error] [client 69.22.229.109] File does not exist: /usr/local/etc/httpd/mywebsite.com/favicon.ico
httpd in malloc(): warning: recursive call
httpd in malloc(): warning: recursive call
httpd in malloc(): warning: recursive call
httpd in malloc(): warning: recursive call
httpd in malloc(): warning: recursive call
httpd in malloc(): warning: recursive call
httpd in malloc(): warning: recursive call
httpd in malloc(): warning: recursive call
httpd in malloc(): warning: recursive call"

I was just worried that this may be some kind of SQL injection attempt.

[jatar_k]

this is the best link I could find

[freebsd.org...]

I also found some references elsewhere.

Does apache crash and restart after this?