FWIW, this new 100% reproducible case is 100% reproducible for a reason,
which I will get to in a minute.

So, given that in two cases where I have had a stalled boot, signalling
mountall with a USR1 has caused the boot to proceed.   This seems like a
race somewhere.

The reason I was able to reproduce this 100% of the time on one
particular given platform is because it's a PXE (i.e. netboot/netroot)
system, booting from the network and mounting it's entire root (which
includes /usr and /var) from an NFS server.  In this scenario I found
that allowing ifup to configure an interface that has already been
configured by the kernel during the netboot was causing the system to
hang.

As a short-term solution until I could research the real, long-term
solution, I decided that given that the interface was already up even
before init was even started, I would just disable it in
/etc/network/interfaces.  That of course also prevents the "initctl emit
-n net-device-up ..." in /etc/network/if-up.d/upstart from firing.

But it would only prevent it from firing for the ethernet interface.
Shouldn't it still fire for lo being ifup'd, giving mountall the USR1 it
needs?

-- 
mountall for /var races with rpc.statd
https://bugs.launchpad.net/bugs/525154
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