I upgrade PHP from 7.0 to 7.2 for magento 188.8.131.52 using redis session storage. But it's tack much time for session connection and got below session errors in log file.
1. PHP Fatal error: Uncaught Error: __clone method called on non-object in /app/code/core/Mage/Core/Model/Session/Abstract.php:214 2. Warning: Unknown: Cannot call session save handler in a recursive manner in Unknown on line 0 3. Warning: Unknown: Failed to write session data using user defined save handler. (session.save_path: /var/lib/php/sessions) in Unknown on line 0
I already use latest version of Cm_RedisSession & Cm_Cache_Backend_Redis.