image.stat() call sometimes fails

Right, after doing a bit more debugging, this looks like a bug in python-rbd only. Running the following python code, I am seeing the same errors about 50% of the time:

import rados
import rbd
cluster = rados.Rados(conffile='/etc/ceph/ceph.conf')
cluster.connect()
ioctx = cluster.open_ioctx('images')
image = rbd.Image(ioctx, '41a6aadf-c655-49c8-b77d-eedd356f5349')
stat = image.stat()
print stat['size'] == image.size()

$ python test.py
True
$ python test.py
Traceback (most recent call last):
  File "test.py", line 7, in <module>
    stat = image.stat()
  File "rbd.pyx", line 1124, in rbd.Image.stat (/build/ceph-XmVvyr/ceph-10.2.2/src/build/rbd.c:10803)
  File "rbd.pyx", line 433, in rbd.decode_cstr (/build/ceph-XmVvyr/ceph-10.2.2/src/build/rbd.c:2440)
  File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xf4 in position 24: unexpected end of data

The "position" in the error is always 24, with varying byte values.

Status changed to 'Confirmed' because the bug affects multiple users.

Upstream bug created: http://tracker.ceph.com/issues/17310

There was a patch merged to glance_store that can serve as a workaround: https://review.openstack.org/373155

Fix is in 10.2.4 which is up next.

10.2.5 is currently blocked in zesty proposed - marking 'Fix Committed' until I get that resolved.

Hi all,

We are seeing the same issues in Ubuntu Trusty running ceph 10.2.6-1trusty

Is there going to to a backport fix for trusty as well? As currently we are unable to take any snapshots or create images using glance with ceph rbd.