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500 - Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.

The error log from ceph-mgr

2019-01-22 04:03:32.673 7efd9d33f700  0 mgr[dashboard] Error while calling fn=<function _rbd_pool_list at 0x7efda5f9e0c8> ex=[errno 22] error getting id for image kubernetes-dynamic-pvc-08cd2beb-1b2e-11e9-a91f-005056b04a8a
Traceback (most recent call last):
  File "/usr/lib64/ceph/mgr/dashboard/tools.py", line 120, in run
    val = self.fn(*self.args, **self.kwargs)
  File "/usr/lib64/ceph/mgr/dashboard/controllers/rbd.py", line 237, in _rbd_pool_list
    stat = self._rbd_image(ioctx, pool_name, name)
  File "/usr/lib64/ceph/mgr/dashboard/controllers/rbd.py", line 155, in _rbd_image
    stat['id'] = img.id()
  File "rbd.pyx", line 1970, in rbd.Image.id (/home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge/release/13.2.4/rpm/el7/BUILD/ceph-13.2.4/build/src/pybind/rbd/pyrex/rbd.c:16379)
InvalidArgument: [errno 22] error getting id for image kubernetes-dynamic-pvc-08cd2beb-1b2e-11e9-a91f-005056b04a8a
2019-01-22 04:03:32.676 7efda0e06700  0 mgr[dashboard] [100.98.60.91:49367] [GET] [500] [0.020s] [sre] [1.7K] /api/block/image
2019-01-22 04:03:32.676 7efda0e06700  0 mgr[dashboard] ['{"status": "500 Internal Server Error", "version": "3.2.2", "detail": "The server encountered an unexpected condition which prevented it from fulfilling the request.", "traceback": "Traceback (most recent call last):\\n  File \\"/usr/lib/python2.7/site-packages/cherrypy/_cprequest.py\\", line 656, in respond\\n    response.body = self.handler()\\n  File \\"/usr/lib/python2.7/site-packages/cherrypy/lib/encoding.py\\", line 188, in __call__\\n    self.body = self.oldhandler(*args, **kwargs)\\n  File \\"/usr/lib/python2.7/site-packages/cherrypy/_cpdispatch.py\\", line 34, in __call__\\n    return self.callable(*self.args, **self.kwargs)\\n  File \\"/usr/lib64/ceph/mgr/dashboard/controllers/__init__.py\\", line 169, in wrapper\\n    return meth(self, *vpath, **kwargs)\\n  File \\"/usr/lib64/ceph/mgr/dashboard/controllers/__init__.py\\", line 498, in _collection\\n    return self._rest_request(False, *vpath, **params)\\n  File \\"/usr/lib64/ceph/mgr/dashboard/controllers/__init__.py\\", line 534, in _rest_request\\n    return method(*vpath, **params)\\n  File \\"/usr/lib64/ceph/mgr/dashboard/controllers/__init__.py\\", line 569, in inner\\n    ret = func(*args, **kwargs)\\n  File \\"/usr/lib64/ceph/mgr/dashboard/controllers/rbd.py\\", line 258, in list\\n    return self._rbd_list(pool_name)\\n  File \\"/usr/lib64/ceph/mgr/dashboard/controllers/rbd.py\\", line 253, in _rbd_list\\n    status, value = self._rbd_pool_list(pool)\\n  File \\"/usr/lib64/ceph/mgr/dashboard/tools.py\\", line 212, in wrapper\\n    return rvc.run(fn, args, kwargs)\\n  File \\"/usr/lib64/ceph/mgr/dashboard/tools.py\\", line 194, in run\\n    raise self.exception\\nInvalidArgument: [errno 22] error getting id for image kubernetes-dynamic-pvc-08cd2beb-1b2e-11e9-a91f-005056b04a8a\\n"}']

the reason for this error (also affects nautilus) are rbd image format 1 images

rbd image 'kubernetes-dynamic-pvc-01f001a8-18cd-11e9-80b9-fa163ecf25c6':
        size 5 GiB in 1280 objects
        order 22 (4 MiB objects)
        snapshot_count: 0
        block_name_prefix: rb.0.6482d76.238e1f29
        format: 1

rbd image 'kubernetes-dynamic-pvc-fb6c9756-41c0-11e9-bbf7-fa163ecf25c6':
        size 10 GiB in 2560 objects
        order 22 (4 MiB objects)
        snapshot_count: 0
        id: a1e4c26b8b4567
        block_name_prefix: rbd_data.a1e4c26b8b4567
        format: 2
        features: layering
        op_features: 
        flags: 
        create_timestamp: Fri Mar  8 17:41:12 2019