Even after disabling my custom module I'm getting this error. When I stopped working on it the day before this wasn't the case. It was working fine and I've been using this same server to develop for about 2 months with no issue like this. I verified I didn't change any major config files. I even tried upgrading magento itself and the exact same behavior continues everything works fine until you try to log into the admin or enable full page cache.
Spent at least 3 hours on this already anyone have any ideas? I get segmentation fault in messages for php-fpm. But I verified all the settings are correct and can even telnet to the php-fpm server. I'm not sure cause is but I verified the server runs fine even opened a phpinfo(); test page just fine.