I just finished moving my site over to SSL after following the Nginx/SSL/SPDY Centminmod guide. Everything appears to be working great, but I've had PHP-FPM crash on me several times within a few minutes after the switch. It just hangs, while Nginx reports 502s. The first time, I wasn't sure what triggered it, the second time, I realized it crashed when I loaded the memcache stat page. Subsequent attempts to load the memcache stat page also crash PHP-FPM, requiring the service to be restarted. I have checked /var/log/php-fpm/www-php.error.log, but there are no recent entries. How else can I troubleshoot this?