Comment # 62 on bug 1055641 from Olli Tuominen

(In reply to Franck Bui from comment #60)
> I'm puzzled...
> 
> According to your comment #32, "dmsetup remove" is supposed to the failing
> command. And this command is executed by
> lib/dracut/hooks/shutdown/25-dm-shutdown.sh.

Yep, I did the change to C#29 (included sleep so got that message out)

> In its turn this script is supposed to be called between "pre-shutdown" and
> "shutdown"  by /shutdown.
> 
> Can you comment the changes in
> /usr/lib/dracut/modules.d/99shutdown/shutdown.sh requested in comment #51,
> recreate the initrd and retry ?

I'll attach two pic which systemd-shutdown fails to unmount but /shutdown is
able to do so.