Wrong permissions are used with PHP's mkdir function.

php ./bin/php/ezpgenerateautoloads.php -e extension/my_extension

ls -al extension/my_extension
drwxr-xr-x 10 rla rla 4096 2009-03-12 16:35 .
drwxr-xr-x 4 rla rla 4096 2009-03-12 13:39 ..
d--------- 2 rla rla 4096 2009-03-12 16:35 autoload
drwxr-xr-x 4 rla rla 4096 2009-03-12 13:34 classes

Reason:
Second parameter to mkdir is 'null' in 'kernel/private/classes/ezautoloadgenerator.php:219'
mkdir( $targetBasedir, null, true );

EZP_INI_FILE_PERMISSION is not set in this environment