I have problems with occasional httpd segfaults on my machine which seem to be caused by php-pecl-apc-3.0.14-3.fc9.i386 according to my investigations. See attached backtrace for details. Maybe this is the culprit: http://news.php.net/php.pecl.dev/4951 If it is then an update to a version >=3.0.16 should fix the problem (3.0.19 is the latest version available on the pecl site).
Created attachment 310010 [details] backtrace
I hit the same bug and tried to build a 3.0.19 version, updated .spec file patch attached. It seems that with new version, there are no more segfaults.
Created attachment 310536 [details] Spec file patch for 3.0.19
Yep, I can confirm that since I installed a rebuilt version with that specfile I no longer see the segfaults.
php-pecl-apc-3.0.19-1.fc8 has been submitted as an update for Fedora 8
php-pecl-apc-3.0.19-1.fc9 has been submitted as an update for Fedora 9
php-pecl-apc-3.0.19-1.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report.