I experience same after adding a new SATA drive and extending the VG ang LV.
I get the "Systemd-shutdown: Failed to finalize DM devices, ignoring." message 
after "shutdown -h now" or "shutdown -P now" command and right after a "click" 
sound from the computer case. I have to manually reset the computer. The 
computer reboots fine.

# pvs
  PV         VG     Fmt  Attr PSize   PFree  
  /dev/sda1  datavg lvm2 a--  298,09g      0 
  /dev/sdb2  sysvg  lvm2 a--   18,62g 468,00m
  /dev/sdb5  datavg lvm2 a--   55,42g      0 
  /dev/sdc1  datavg lvm2 a--  149,05g      0 
  /dev/sdd1  datavg lvm2 a--   37,27g      0 

# lvs
  LV     VG     Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync 
  lvdata datavg -wi-ao---- 539,82g                                              
  lvroot sysvg  -wi-ao----  16,77g                                              
  lvswap sysvg  -wi-ao----   1,39g  

# mount | grep mapper
/dev/mapper/sysvg-lvroot on / type ext4 
/dev/mapper/datavg-lvdata on /mnt/data type ext4 

# uname -r

# lvm version
  LVM version:     2.02.133(2) (2015-10-30)
  Library version: 1.02.110 (2015-10-30)
  Driver version:  4.34.0

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.1 LTS
Release:        16.04
Codename:       xenial

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  root on dm-cache : always do full resync after reboot

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