Public bug reported:

Arch: s390x
Release: Yakkety / 16.10

This happens on some (but not all) system starts with Yakkety. In Xenial
(which is using the same 4.4 kernel version the Yakkety systems were
using when the problem was first observed) this did not happen. The
system (LPAR) this was seen first was an upgrade from Xenial but since
then has been freshly installed with Yakkety. The same behaviour is seen
on a zVM guest running Yakkety.

The attached syslog shows a failed boot, followed by one that did work. Note 
the "Found device .*(sclp|encc00).*" messages in the good boot. Those are 
missing in the bad attempt and as a result networking and console fail to be 
usable. Also note, those boots were 4.8 kernels but we saw this with 4.4 
kernels, too.
This might be a systemd problem / race, I just filed it into udev for now as 
that better matches the not finding basic devices symptom.

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Bad and good boot logs"
   
https://bugs.launchpad.net/bugs/1623383/+attachment/4740675/+files/syslog-20160914.txt

** Package changed: ubuntu => udev (Ubuntu)

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https://bugs.launchpad.net/bugs/1623383

Title:
  Some restarts fail due to missing base devices

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