Comment # 3 on bug 1068197 from Thorsten Kukuk

(In reply to Atanas Bombov from comment #2)

> I can accept snapshot #1 is the current one, although snapper list shows:
> Type   | # | Pre # | Date                          | User | Cleanup |
> Description           | Userdata
> -------+---+-------+-------------------------------+------+---------+--------
> ---------------+---------
> single | 0 |       |                               | root |         |
> current               |         
> single | 1 |       | Fri 19 Aug 2016 15:47:59 CEST | root |         | first
> root filesystem |       

As written, 0 is a virtual entry, not a real snapshot.
Is this output really complete?

> However, there is a snapshot 24 which is not supposed to be there taking 12G
> space:
> du -sh /.snapshots/*
> 11G     /.snapshots/1
> 12G     /.snapshots/24

du -sh only tells you how big the snapshot is, NOT how much disk space it is
using. btrfs is a CoW filesystem!
If snapper list does not list this snapshot 24, then something did go wrong and
you need to delete that manually.