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This guide is meant to augment the official Upgrade guide. Please read the official upgrade steps in UPGRADE.txt as well as in the Drupal.org Dcoumentation thoroughly to ensure that you understand every aspect of the upgrade process. This guide is for more advanced users with SSH experience.
I was getting reports of "500 Internal Server Errors" on two of my web servers. And after further investigation it looks like it was related to the following error.
(4)Interrupted system call: FastCGI: comm with server "php-fastcgi.fcgi" aborted: select() failed
After doing some reasearch I stumbled upon the following patch.