[Bug 1074597] Re: Latest updates break LVM detection on boot

[Alexandros]

Rebooted with previous kernel but problem persists.

Ran update-initramfs to recreate initrd and problem persists.

This must be related to the way new udev works?

** Tags added: udev

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Title:
  Latest updates break LVM detection on boot

Status in “udev” package in Ubuntu:
  New

Bug description:
  Description:	Ubuntu 12.04.1 LTS
  Release:	12.04

  Last night I installed the following updates using the "software
  updater" (/var/log/apt/history.log):

  Start-Date: 2012-11-03  02:23:04
  Commandline: aptdaemon role='role-commit-packages' sender=':1.59'
  Upgrade: base-files:i386 (6.5ubuntu6.2, 6.5ubuntu6.4), gnome-power-manager:i386 (3.4.0-0ubuntu1, 3.4.0-0ubuntu1.1), gir1.2-gudev-1.0:i386 (175-0ubuntu9.1, 175-0ubuntu9.2), udev:i386 (175-0ubuntu9.1, 175-0ubuntu9.2), libgudev-1.0-0:i386 (175-0ubuntu9.1, 175-0ubuntu9.2), libudev0:i386 (175-0ubuntu9.1, 175-0ubuntu9.2)
  End-Date: 2012-11-03  02:23:45

  Since then, I am unable to boot my system because LVM volumes are not
  detected. Since the /home folder is on an LVM device, Ubuntu fails to
  mount it and prompts me to either skip (press S) or try manually
  (press M).

  I am forced to press M, type "vgscan" followed by "mount -a" and then
  logout to resume the boot normally.

  I have attached kern.log for the past few days. It seems to me that
  the only difference is that after the update my mdraid volumes acquire
  different device names:

  Boot immediately before the update:
  Nov  3 02:20:02 elmo kernel: [    3.984469] md/raid1:md127: active with 2 out of 2 mirrors
  Nov  3 02:20:02 elmo kernel: [    3.984469] md127: detected capacity change from 0 to 8584626176
  Nov  3 02:20:02 elmo kernel: [    3.994084] md/raid1:md126: active with 2 out of 2 mirrors
  Nov  3 02:20:02 elmo kernel: [    3.994120] md126: detected capacity change from 0 to 8584626176

  UPDATE: Start-Date: 2012-11-03  02:23:04 (see history.log above)

  Boot immediately after the update:
  Nov  3 07:16:49 elmo kernel: [    3.871347] md/raid1:md0: active with 2 out of 2 mirrors
  Nov  3 07:16:49 elmo kernel: [    3.871371] md0: detected capacity change from 0 to 8584626176
  Nov  3 07:16:49 elmo kernel: [    6.837048] md/raid1:md127: active with 2 out of 2 mirrors
  Nov  3 07:16:49 elmo kernel: [    6.837068] md127: detected capacity change from 0 to 8584626176

  There is a significant delay in detecting the second md volume.  Also,
  a lot of things run now before the second volume is detected, so I
  suspect that the LVM scan takes place prematurely (both md raids are
  part of the same LVM volume).

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