Description of problem: Mass promote of all mirrored images in a pool hangs indefinitely.


Version-Release number of selected component (if applicable): ceph version 12.2.0-2.el7cp 

Steps to Reproduce:
1. Configured 2 cluster master/slave.
2. Configured pool based mirroring on pool named "data". Created 3 images on it.
3. Mass demoted images on primary pool(master client) -> Got successfully demoted.
4. Mass promoted images on secondary pool(slave client) -> Promote hangs indefinitely

Opened another session and checked, images had got promoted.
for i in {1,2,3};do sudo rbd mirror image status data/image-$i --cluster slave;done
image-1:
  global_id:   6831f666-661c-4d8d-9ffb-37eafb42d5d9
  state:       up+stopped
  description: local image is primary
  last_update: 2017-09-18 15:16:51
image-2:
  global_id:   dd6e7518-f655-4d51-8622-7d30b10043e7
  state:       up+stopped
  description: local image is primary
  last_update: 2017-09-18 15:16:51
image-3:
  global_id:   02d42798-59c8-49fa-bc91-19d9eeed6d16
  state:       up+stopped
  description: local image is primary
  last_update: 2017-09-18 15:16:51

Actual results:


Expected results:


Additional info: