> @ddstreet tested with the latest version of ifupdown and vlan from your PPA 
> with
> my 4 testscenario's and can confirm it works as expected. Interfaces come up
> correctly both when doing an "ifup -a" and during boot.

Excellent, thanks.

> One small thing I've noticed is a variation in the number of "Set name-type 
> for
> VLAN subsystem. Should be visible in /proc/net/vlan/config" messages in the
> ifup output depending on the different scenario, even though the number of
> vlans is the same in all 4 tests

That's because in your config tests with vlans on bonds, your call to
ifup -a doesn't actually process the bond or its vlans.  Your ifup -a
starts processing one of the bond slaves, and that causes the bond
interface to by created.  The bond creation is detected by udev, and
udev tells systemd, and systemd then invokes ifup directly on the bond
interface.  By the time your ifup -a has gotten to trying to bring up
the bond (or its vlans), they are already up because of udev detection
which invokes the 'hotplug' ifup that logs to systemd logs, not your
stdout.

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https://bugs.launchpad.net/bugs/1701023

Title:
  (on trusty) version 1.9-3ubuntu10.4 regression blocking boot
  completion

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