Comment # 9 on bug 1080485 from Ronnie Bailey

There are 2 primary errors on my system. I had to shoot a video to be able to
catch and read them. There may be 60 or more repeats over a half second time
period. I should note that this happens 80% of the time. So there are times
when shutdown is without errors. 

Error 1: device-mapper: remove ioctl on system-root failed: Device or resource
busy  (system-root is my encrypted LVM Luks root partition)

Error 2: device-mapper: remove ioctl on
cr_scsi_hard_drive_partition_containing_root

My /home is also a partition within the same LVM, but never produces errors.

SLES 11 SP4 had a problem that produced the same error in 2016, but it's
possible that the cause is not identical. Suse document is 7017390