Codeigniter loading session class timeout

The session is automatically loaded with autoload configuration. It used to be fine. Today, this error suddenly exists {code ...} I looked at the source code of 247 lines, and some of them said session on the Internet, like fwrite ($ this-& amp; gt; _ file_handle, substr ($ session_data, $ written... the session is automatically loaded with autoload configuration. It used to be fine. This error suddenly occurred today.

Fatal error: Maximum execution time of 30 seconds exceeded in/data/web/admin/system/libraries/Session/drivers/Session_files_driver.php on line 247

I looked at the 247-line source code, which is probably a function like this.Fwrite ($ this-> _ file_handle, substr ($ session_data, $ written ))
Some on the Internet say that the session storage directory has no permission. I checked that the permission is 777. Please wait online!

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The session is automatically loaded with autoload configuration. It used to be fine. This error suddenly occurred today.

Fatal error: Maximum execution time of 30 seconds exceeded in/data/web/admin/system/libraries/Session/drivers/Session_files_driver.php on line 247

I looked at the 247-line source code, which is probably a function like this.Fwrite ($ this-> _ file_handle, substr ($ session_data, $ written ))
Some on the Internet say that the session storage directory has no permission. I checked that the permission is 777. Please wait online!

Check if the disk is full?