Comment 7 for bug 28439

Ok, the most interesting fact there is your reply to #2 ... you should not have a /dev/.udev/queue directory at that point.

So here's some more things to try

After booting (but before running udevd --daemon) does /dev/.udev/queue exist?

Is /dev/.udev/queue empty or is there something in it?

Is /dev a mountpoint and a tmpfs? (check /proc/mounts)

Is /dev empty?

Is there a /dev/.udev/failed?

Is there anything in /dev/.udev/failed?

Thanks

(The reason that udevplug is failing is because it's waiting for that directory to go away before it starts its work, and that directory never goes away -- so after 3 minutes it times out having done nothing, so you're left with whatever the initramfs prepared, which amongst other things means no permissions)