I have compiled apache 2.0 with PHP 4.2.0

When I try start session PHP return warning:
Warning: open(/tmp/sess_*, O_RDWR) failed: Invalid argument (22) in xx on line y

Warning: open(/tmp/sess_*, O_RDWR) failed: Invalid argument (22) in Unknown on line 0

Warning: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

I'am really sure that in php.ini I have right path and the directory have sufficient access right. 

Before than I upgrate to PHP 4.2.0 all get fine (last function version was PHP 4.1.2, Apache 1.3.24). 

I'am using for testing this script:
<?php
session_start();
if (isset($HTTP_SESSION_VARS['count'])) {
   $HTTP_SESSION_VARS['count']++;
}
else {
   $HTTP_SESSION_VARS['count'] = 0;
}
?>

I hope that I don't trouble you with my mistake.

Best regards
   Radek