[Bug 1625217] Re: udev sometimes doesn't apply systemd tag to devices

[Seth Forshee]

** Attachment added: "Output of 'udevadm info --export-db' from a failed boot"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1625217/+attachment/4751945/+files/udev-db.txt

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Title:
  udev sometimes doesn't apply systemd tag to devices

Status in systemd package in Ubuntu:
  New

Bug description:
  Since upgrading this machine to yakkety I've seen periodic hangs
  during booting. If I wait long enough systemd give up and drops to
  maintenance mode. Looking in the journal I see events like this:

  Sep 19 08:24:22 ubuntu-xps13 systemd[1]: dev-disk-by\x2duuid-
  63cd6483\x2ddf95\x2d4426\x2d916e\x2d8c28becbfd8f.device: Job dev-disk-
  by\x2duuid-
  63cd6483\x2ddf95\x2d4426\x2d916e\x2d8c28becbfd8f.device/start timed
  out.

  Searching on the internet indicates that this happen if devices
  reported by udev don't have the "systemd" tag, and I find that they do
  not have the tag when the boot times out but they do have the tag when
  boot does not time out.

  This happens once for every 3 or 4 boots and with both 4.4 and 4.8
  kernels. I'm attaching the output of 'journalctl -xb' and 'udevadm
  info --export-db' from a timed-out boot.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: udev 231-6
  ProcVersionSignature: Ubuntu 4.8.0-11.12-generic 4.8.0-rc6
  Uname: Linux 4.8.0-11-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Sep 19 09:27:08 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-02-19 (577 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150110)
  MachineType: Dell Inc. XPS 13 9343
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-11-generic root=UUID=bdad03f3-06c0-439d-8869-32fad0b1851b ro quiet splash
  SourcePackage: systemd
  UpgradeStatus: Upgraded to yakkety on 2016-01-08 (254 days ago)
  dmi.bios.date: 05/15/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 0TM99H
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd05/15/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0TM99H:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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