Hi,

I have the following snapshot scheme:

$ snapper list
Type   | #   | Pre # | Date                     | User | Cleanup |
Description           | Userdata
-------+-----+-------+--------------------------+------+---------+-----------------------+-------------
single | 0   |       |                          | root |         |
current               |
single | 1   |       | Thu Apr 16 22:07:21 2015 | root |         |
first root filesystem |
single | 329 |       | Sat May 23 16:24:19 2015 | root |         |
                  |
pre    | 377 |       | Fri Jun 12 16:57:39 2015 | root | number  |
zypp(zypper)          | important=no
post   | 378 | 377   | Fri Jun 12 16:57:40 2015 | root | number  |
                  | important=no
pre    | 379 |       | Sat Jun 13 21:35:43 2015 | root | number  |
yast snapper          |

or

$ btrfs subvolume list /
ID 257 gen 67733 top level 5 path .snapshots
ID 258 gen 67694 top level 257 path .snapshots/1/snapshot
...
ID 276 gen 66670 top level 258 path .snapshots/1/snapshot/var/lib/machines
ID 642 gen 67730 top level 257 path .snapshots/329/snapshot
ID 694 gen 67694 top level 257 path .snapshots/377/snapshot
ID 695 gen 67694 top level 257 path .snapshots/378/snapshot
ID 697 gen 67729 top level 257 path .snapshots/379/snapshot

When I try to remove the snapshot 329, I get custom errors everytime:
  * system freezes completely (the most frequent outcome)
  * systems becomes absolutely unresponsive, i.e. can't run processes,
can't connect to dbus, etc.
  * some error message comes out.

This snapshot appeared on its own when I was cleaning other pre-post
snapshots in "snapper".
The OS is OpenSUSE: kernel 4.0.5, btrfs-progs v4.0+20150429

Is it an expected behaviour?
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