[Bug 222106] autounmountd does not remove entries in /var/db/mounttab

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222106

            Bug ID: 222106
           Summary: autounmountd does not remove entries in
                    /var/db/mounttab
           Product: Base System
           Version: 11.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mat.oestreicher at gmail.com

NFS via autofs:

Using autofs to (un)mount NFS, the 'autounmountd' does
not remove entries from /var/db/mounttab (on client) and
/var/db/mountdtab (on nfs-server) when client
disconnects after timeout.

Then running 'mount' on the client shows nfs filesystem is no longer
mounted.

But looking at 'showmount' on the server, shows client still connected
even if it isn't.

- map type makes no difference 
- mount options not changed from default

no problem though using "mount -t nfs ..." and "umount"
Then those entries are removed when unmounted.

Accessing the same nfs-server from a Fedora 26 or Debian 8
client via autofs (same autofs config as on FreeBSD) then the
entry on the server in /var/db/mountdtab is removed when client
disconnects.

This problem has existed since 10.3.

Also new setup server/client from scratch shows same
behavior.

My 2nd thread on the forum, regarding this problem:
https://forums.freebsd.org/threads/62232/#post-359377

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