[Bug 286260] NFS: sharing only for IPv6 subnet fails

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286260

--- Comment #5 from Rick Macklem <rmacklem@FreeBSD.org> ---
Ok. I have found a bug in mountd that might have
resulting in what you observed.
When mountd receives a SIGHUP, it is supposed to
update the exports in the kernel with all entries
that have changed.

However, the function that checks to see if an
entry has changed (called compare_export()) checks
for things like different export flags.
It does not check to see that the address/family
has changed. This is a bug.
--> Adding the IPv4 export changed it so that it
    got updated.

If I am correct, restarting mountd would have fixed
the case where the IPv6 entry was the only one but
reloading mountd would not have.

I will come up with a patch for this bug.

If you can reproduce the failed case, please try
restarting mountd and let us know if that fixes
the problem.

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