4.8-rc1 had the same behaviour (landed into initramfs), so I figure I'd
dig a bit. Long story short, this was entirely due to the following
error :

/scripts/init-top/udev: line 14: can't create /sys/kernel/uevent_helper:
Permission denied

CONFIG_UEVENT_HELPER was y in 4.2, but got switched to "not set" in at
least 4.7 and 4.8.

I modified /usr/share/initramfs-tools/scripts/init-top/udev to not error
out on the "echo" to /sys/kernel/uevent_helper, and then the node booted
properly \o/

I'll let you know if it's more stable or not.

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https://bugs.launchpad.net/bugs/1602577

Title:
  [arm64] compute nodes unstable after upgrading from 4.2 to 4.4 kernel

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