[Bug 1623383] Re: Some restarts fail due to missing base devices

[Po-Hsu Lin]

Here is the number from the beginning of this SRU cycle till today
(since Jul. 3)

We have 6 jobs for each node, which requires at least 6 re-deployments
(note that it's just a reboot for s390x, since we don't re-deploy them).

The failures here means how many times we need to reboot it manually.
The total jobs count on jenkins is larger than the sum of failures + 6, as one failure may cause all the other job to fail and need to be restarted.

s2lp4 (Ubuntu on LPAR) - 1 failures, jobs count: 17
kernel02 (zVM) - 2 failures, jobs count: 16
s2lp6g003 (zKVM) - 6 failures, jobs count: 9
kernel03 (zKVM) - 7 failures, jobs count: 21

kernel03 is still running. The number of failures and jobs count will
change.

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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:
  Confirmed

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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