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Clone operations are failing with Assertion Error.
When we create more clone in my case i have created 130[root@ceph-amk-bz-2-qa3ps0-node7 _nogroup]# ceph fs clone status cephfs clone_status_142

Error EINVAL: Traceback (most recent call last):
  File "/usr/share/ceph/mgr/volumes/fs/operations/versions/__init__.py", line 96, in get_subvolume_object
    self.upgrade_to_v2_subvolume(subvolume)
  File "/usr/share/ceph/mgr/volumes/fs/operations/versions/__init__.py", line 57, in upgrade_to_v2_subvolume
    version = int(subvolume.metadata_mgr.get_global_option('version'))
  File "/usr/share/ceph/mgr/volumes/fs/operations/versions/metadata_manager.py", line 144, in get_global_option
    return self.get_option(MetadataManager.GLOBAL_SECTION, key)
  File "/usr/share/ceph/mgr/volumes/fs/operations/versions/metadata_manager.py", line 138, in get_option
    raise MetadataMgrException(-errno.ENOENT, "section '{0}' does not exist".format(section))
volumes.fs.exception.MetadataMgrException: -2 (section 'GLOBAL' does not exist)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/share/ceph/mgr/mgr_module.py", line 1446, in _handle_command
    return self.handle_command(inbuf, cmd)
  File "/usr/share/ceph/mgr/volumes/module.py", line 437, in handle_command
    return handler(inbuf, cmd)
  File "/usr/share/ceph/mgr/volumes/module.py", line 34, in wrap
    return f(self, inbuf, cmd)
  File "/usr/share/ceph/mgr/volumes/module.py", line 682, in _cmd_fs_clone_status
    vol_name=cmd['vol_name'], clone_name=cmd['clone_name'],  group_name=cmd.get('group_name', None))
  File "/usr/share/ceph/mgr/volumes/fs/volume.py", line 622, in clone_status
    with open_subvol(self.mgr, fs_handle, self.volspec, group, clonename, SubvolumeOpType.CLONE_STATUS) as subvolume:
  File "/lib64/python3.6/contextlib.py", line 81, in __enter__
    return next(self.gen)
  File "/usr/share/ceph/mgr/volumes/fs/operations/subvolume.py", line 72, in open_subvol
    subvolume = loaded_subvolumes.get_subvolume_object(mgr, fs, vol_spec, group, subvolname)
  File "/usr/share/ceph/mgr/volumes/fs/operations/versions/__init__.py", line 101, in get_subvolume_object
    self.upgrade_legacy_subvolume(fs, subvolume)
  File "/usr/share/ceph/mgr/volumes/fs/operations/versions/__init__.py", line 78, in upgrade_legacy_subvolume
    assert subvolume.legacy_mode
AssertionError

Steps to Reproduce:

Create Subvolumegroup
ceph fs subvolumegroup create cephfs subvolgroup_clone_status_1
Create Subvolume
ceph fs subvolume create cephfs subvol_clone_status --size 5368706371 --group_name subvolgroup_clone_status_1
Kernel mount the volume and fill data
Create Snapshot
ceph fs subvolume snapshot create cephfs subvol_clone_status snap_1 --group_name subvolgroup_clone_status_1
Create 200 Clones out of the above subvolume until the cluster is full
ceph fs subvolume snapshot clone cephfs subvol_clone_status snap_1 clone_status_1 --group_name subvolgroup_clone_status_1