I have a child rbd that doesn't acknowledge its parent. this is with Kraken (11.2.0)
The misbehaving child was 'flatten'ed from its parent, but now I can't remove the snapshot because it thinks it has a child still.
root@tyr-ceph-mon0:~# rbd snap ls tyr-p0/51774a43-8d67-4d6d-9711-d0b1e4e6b5e9_delete
SNAPID NAME SIZE
2530 c20a31c5-fd88-4104-8579-a6b3cd723f2b 1000 GB
root@tyr-ceph-mon0:~# rbd children tyr-p0/51774a43-8d67-4d6d-9711-d0b1e4e6b5e9_delete@c20a31c5-fd88-4104-8579-a6b3cd723f2b
tyr-p0/a56eae5f-fd35-4299-bcdc-65839a00f14c
root@tyr-ceph-mon0:~# rbd flatten tyr-p0/a56eae5f-fd35-4299-bcdc-65839a00f14c
Image flatten: 0% complete...failed.
rbd: flatten error: (22) Invalid argument
2017-08-04 08:33:09.719796 7f5bfb7d53c0 -1 librbd::Operations: image has no parent
root@tyr-ceph-mon0:~# rbd snap unprotect tyr-p0/51774a43-8d67-4d6d-9711-d0b1e4e6b5e9_delete@c20a31c5-fd88-4104-8579-a6b3cd723f2b
2017-08-04 08:34:20.649532 7f91f5ffb700 -1 librbd::SnapshotUnprotectRequest: cannot unprotect: at least 1 child(ren) [1d0bce6194cfc3] in pool 'tyr-p0'
2017-08-04 08:34:20.649545 7f91f5ffb700 -1 librbd::SnapshotUnprotectRequest: encountered error: (16) Device or resource busy
2017-08-04 08:34:20.649550 7f91f5ffb700 -1 librbd::SnapshotUnprotectRequest: 0x55d69346da40 should_complete_error: ret_val=-16
2017-08-04 08:34:20.651800 7f91f5ffb700 -1 librbd::SnapshotUnprotectRequest: 0x55d69346da40 should_complete_error: ret_val=-16
rbd: unprotecting snap failed: (16) Device or resource busy
root@tyr-ceph-mon0:~# rbd info tyr-p0/a56eae5f-fd35-4299-bcdc-65839a00f14c
rbd image 'a56eae5f-fd35-4299-bcdc-65839a00f14c':
size 1000 GB in 256000 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.1d0bce6194cfc3
format: 2
features: layering
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