Description:
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APC version 3.0.9

./configure --with-mysql=/usr --with-mysqli=/usr/bin/mysql_config --enable-soap --with-xsl --with-zlib --enable-mbstring --with-openssl --with-apache=../apache_%{apache_version} --enable-track-vars --without-pear --disable-cli --with-gmp --without-spl --without-sqlite --without-pdo

We also dynamically link the mailparse extension.

With 3.0.8, APC worked great, except for bug #6634.  We were anxious to get 3.0.9 set up, as it fixed the bug.  In our development environment, we tested out 3.0.9, and it worked great -- we could actually use APC on some pages that we had disabled APC for earlier.

When we put 3.0.9 in our production environment, however, we had some serious issues.  The number of Apache processes running went up significantly right from the start (almost double), and kept on rising slowly.  As soon as we hit our limit for Apache processes, Apache stopped responding.  We had to keep on restarting Apache to keep the number of processes reasonable.  Downgrading to 3.0.8 fixed the problem.  Incidentally, the number of Apache processes even rose on servers that weren't serving a single Apache request.

We can't reproduce it with any one script.  My guess would be that something is hanging the process, so it never processes any more requests.