[Bug 1574333] Re: LVM-based server does not boot with kernel 4.4 (but works with 4.2)

[Frédéric Grosshans]

Update : It works now with 4.4.0-22, in recovery mode, and continuing
the normal boot sequence.

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Title:
  LVM-based server does not boot with kernel 4.4 (but works with 4.2)

Status in lvm2 package in Ubuntu:
  Confirmed

Bug description:
  I‘ve updated my home-made NAS from wily to xenial and it stopped
  booting.

  Selecting the 4.2 kernel on the grub menu makes it work again.

  The working kernel is 4.2.0-35-generic

  The failing kernel is 4.4.0-21-generic.

  When the booting sequence freezes, I can have a terminal with the
  following text :

   lvmetad is not active yet, using direct activation during sysinit
  Scannig for Btrfs flesystems
  _

  Actually my set-up is lvm based, and the correponding lines of the
  output of a mount command are

  /dev/mapper/clio-root on / type btrfs (rw,relatime,nospace_cache,subvolid=256,subvol=/@)
  /dev/mapper/clio-root on /mnt/clio-root type btrfs (rw,relatime,nospace_cache,subvolid=5,subvol=/)
  /dev/mapper/clio-root on /home type btrfs (rw,relatime,nospace_cache,subvolid=257,subvol=/@home)

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