I suffered the same problem and was able to nail it down to udev! (see
also bug 77325)
Indeed, the mountnfs script in if-up.d is never run, because interfaces are
already up when rcS reaches S40networking.
The reason for this is, that udev get's notice of the hardware and calls itself
(via /etc/udev/rules/85-ifupdown.rules) an "ifup --allow auto $env{INTERFACE}",
which enables the interface.
This is obviously too early in the boot process (S10), to successfully
initialize NFS(4). Since it is called in the background (start-stop-
daemon), it may eventually be delayed so that it may succeed.
My fix and suggestion is to change the "auto-CLASS" (see man ifup) for the udev
invocation.
When changing "--allow auto" to "--allow udev" only those interfaces marked
with e.g. "allow-udev eth0" are brought up by udev.
This gives the admin control where interfaces are handled (udev or
S40networking).
--
NFSv4 mounts often missing after boot
https://launchpad.net/bugs/46516
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