** Changed in: systemd (Ubuntu)
       Status: Confirmed => Won't Fix

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

Title:
  Some restarts fail due to missing base devices

Status in systemd package in Ubuntu:
  Won't Fix

Bug description:
  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.

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