Comment 4 for bug 654470

This is relevant: http://ubuntuforums.org/showthread.php?t=1638349

As is this: http://forum.nginx.org/read.php?3,122171

Uninstalling php-apc has made a dramatic difference for me. I haven't exercised it for long enough to say whether it is a complete cure. Nevertheless, a proper solution is desirable.