I got this error on shutdown, when I had attached loop devices.
Looking in mountfs I found this command
umount --all --detach-loop --read-only \
--types notmpfs,nosysfs,nodevtmpfs,noproc,nodevpts >/dev/null
nodevtmpfs excludes all devtmpfs filesystems from unmounting.
/dev is a devtmpfs filesystem, therefore all loop devices are excluded.
So --detach-loop is a no op.
I have inserted the line
losetup -D
before the umount command, and all is fine now.
Regards
Klaus Wulff
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