[Bug 1731566] Re: systemd-udevd delays boot for 4+ minutes when an LVM PV is inside an LV

[Dimitri John Ledkov]

> KVM/Qemu libvirt VM guest's vda with PV in it stored in host LV.

But the inner PV is only for the guest to use - no?
and thus it should not be mounted on the host, on boot.
Or do you somehow mount and access that PV on the host as well as the guest? That doesn't sound right.

Or are you saying when such things exist (and not required to mount/boot
the host) the boot stalls nonetheless, and should not?

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Title:
  systemd-udevd delays boot for 4+ minutes when an LVM PV is inside an
  LV

Status in systemd package in Ubuntu:
  New
Status in udev package in Debian:
  New

Bug description:
  $ lsb_release -rd
  Description:	Ubuntu 17.10
  Release:	17.10

  $ apt-cache policy udev
  udev:
    Installed: 234-2ubuntu12.1
    Candidate: 234-2ubuntu12.1
    Version table:
   *** 234-2ubuntu12.1 500
          500 http://us.archive.ubuntu.com/ubuntu artful-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu artful-security/main amd64 Packages
          100 /var/lib/dpkg/status
       234-2ubuntu12 500
          500 http://us.archive.ubuntu.com/ubuntu artful/main amd64 Packages

  Expected:

  Ubuntu 17.10 booting up as fast as Ubuntu 16.04

  What happened instead:

  During boot up the system will hang and then a timeout will allow it
  continue. This happens twice.

  The first one occurs right after the network interfaces are renamed. Example:
  [    5.160480] e1000e 0000:02:00.0 enp2s0f0: renamed from eth0
  [  121.345255] raid6: sse2x1   gen()  4431 MB/s

  The second one is from /scripts/init-bottom/lvm where 'udevadm
  --settle' is run.

  # we cannot properly synthesize LVM LV change events with udevadm trigger, so
  # if we use LVM, we need to let it finish; otherwise we get missing LV symlinks
  # (LP #1185394)
  if [ -x /sbin/vgchange ]; then
      udevadm settle --timeout=121 || true
  fi

  Reproducing:

  Where $vg is some existing volume group name:

  lvcreate -n pvtest -L 20m $vg
  pvcreate /dev/$vg/pvtest
  reboot

  Use case:

  KVM/Qemu libvirt VM guest's vda with PV in it stored in host LV.
  This is somewhat involuntary as certain appliance VMs come configured this way.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: udev 234-2ubuntu12.1
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Nov 10 18:29:33 2017
  InstallationDate: Installed on 2017-11-05 (5 days ago)
  InstallationMedia: Ubuntu-Server 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
  MachineType: System manufacturer System Product Name
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-generic root=/dev/mapper/vg1-root ro verbose
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/05/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3029
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M4A89GTD-PRO/USB3
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3029:bd07/05/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A89GTD-PRO/USB3:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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