WordPress 4.2 && wp_tempname function

Hi everyone,

Since i updated my wordpress website to 4.2, i am no more able to upgrade my extensions from the backend. When i try to update for example contact form, i have this error:

Fatal error: Maximum function nesting level of ‘250’ reached, aborting! in website_root/wp-admin/includes/file.php on line 154

Looks like the wp_tempname not correctly working?
in the function, var_dump said:

var_dump($dir) = “/tmp/” (look good, tmp is 777 so no prob with it)
var_dump($filename) = “.maintenance” (look not good)

So basename on $filename failed and my apache die cause nested loop
Anybody else got this problem?

Thank you for you help