Strange Session Errors

After upgrading to PHP 4.2.1 on my Linux 2.2.14 box, I've started to receive this error by the hundreds in my logs: Jun 17 11:37:35 www httpd: PHP Warning: Failed to write session data (files). Please verify that the current sett ing of session.save_path is correct (/tmp) in Unknown on line 0 Now these errors did not appear with PHP 4.0.6. Now I know that sessions are still working since I registered some values and found them by grepping /tmp. And most of my PHP sites would not be working if sessions weren't working. And yes, I've checked that: -The apache user has permission to read/write to /tmp -There is enough space on my partition. I've done some searching and found a few other Linux users with the same problem, so I'm wondering if this is a PHP bug...but I'm not sure. Thanks, Ricky