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

[Dimitri John Ledkov]

On 13 March 2017 at 16:58, Ian Thompson <1623383 at bugs.launchpad.net> wrote:
> I have the same problem with two Dell PowerEdge FC630.
> Ubuntu 16.04.2 LTS/ 4.4.0-66-generic
>
> Shutdown/reboot stalls at different points each attempt.
>
> An IBM System x3650 M4 in the same rack, at the same software level,
> reboots cleanly every time.
>

Could you please open a new bug report using ubuntu-bug tool and
include systemd journal which includes failed boots?
Just in case if this is not the same issue. As so far we have only
reproduced this on s390x architecture.
Please enable persistent journal first by doing $ sudo mkdir -p /var/log/journal


-- 
Regards,

Dimitri.

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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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