Starting with Red Hat Enterprise Linux 5.4, behavior of the
autofs command has changed. For more information, refer to BZ#452122
umount -l would unmount all autofs-managed mounts and autofs internal mounts at start-up, and then mounted all autofs mounts again as a part of the start-up procedure. As a result, the execution of the external
umount -l command was not needed.
The previous autofs behavior can be used via the following commands:
service autofs forcerestart
service autofs forcestart