php-fpm keeps locking up

Question

For some reason, php-fpm keeps locking up and/or hanging. It works for a little while, and then it will randomly just 'hang' for a long time upon trying to load a webpage. There's absolutely nothing in my php-fpm.log about it, and I have no idea how to track down the problem otherwise. Can you guys help me track it down by pointing me in a new direction?

CentOS 6.2 [root@3AC19 ~]# php-fpm -v PHP 5.3.9 (fpm-fcgi) (built: Jul 5 2012 04:04:34) 

Answer 1

Try to profile the hung php-fpm process using strace -p <PID_of_php-fpm process>. You can also try to get stacktrace samples using gdb, more details here.