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

[Seth Forshee]

This is still happening, and it feels like a race. I've enabled debug
logging and captured the journal from good and bad boots. Comparing them
hasn't told me a whole lot; on the whole the udev debug logging isn't
very applicable. I do see that in both cases udev starts up and reads
the exact same set of rule files, and the statistics it prints about the
rule files are identical. Both have read in
/lib/udev/rules.d/99-systemd.rules which contains the rule for adding
the systemd tag. Nothing else has really stood out yet, but they are
pretty difficult to compare.

I also find that if I run 'udevadm trigger -c add
/sys/devices/pci0000:00/0000:00:1f.2/ata4/host3/target3:0:0/3:0:0:0/block/sda'
from recovery mode that udev does add the systemd tag at that point.

I'll attach my logs and udev databases from the good and bad boots.

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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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