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

[Frédéric Grosshans]

Public bug reported:

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)

** Affects: lvm2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: kernel

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https://bugs.launchpad.net/bugs/1574333

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

Status in lvm2 package in Ubuntu:
  New

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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