Comment 1 for bug 1687867

I'm also running into the same issue/error.
I had successfully deployed an TripleO Undercloud Node about 1 weeks ago.
Now, I'm trying to install the undercloud on a different node and it fails with above error.
Looks like some code have changed within the last week.

PS: I'm installing undercloud on a baremetal node.

ERRORS:
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2017-05-03 15:16:17,448 INFO: Created flavor "swift-storage" with profile "swift-storage"
2017-05-03 15:16:17,449 ERROR:
#############################################################################
Undercloud install failed.

Reason: object.__new__(thread.lock) is not safe, use thread.lock.__new__()

See the previous output for details about what went wrong. The full install
log can be found at /home/stack/.instack/install-undercloud.log.

#############################################################################

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 1529, in install
    _post_config(instack_env)
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 1454, in _post_config
    session=sess)
  File "/usr/lib/python2.7/site-packages/mistralclient/api/client.py", line 19, in client
    return client_v2.Client(auth_type=auth_type, **kwargs)
  File "/usr/lib/python2.7/site-packages/mistralclient/api/v2/client.py", line 42, in __init__
    req = copy.deepcopy(kwargs)
  File "/usr/lib64/python2.7/copy.py", line 163, in deepcopy
    y = copier(x, memo)
  File "/usr/lib64/python2.7/copy.py", line 257, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib64/python2.7/copy.py", line 190, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "/usr/lib64/python2.7/copy.py", line 334, in _reconstruct
    state = deepcopy(state, memo)
  File "/usr/lib64/python2.7/copy.py", line 163, in deepcopy
    y = copier(x, memo)
  File "/usr/lib64/python2.7/copy.py", line 257, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib64/python2.7/copy.py", line 190, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "/usr/lib64/python2.7/copy.py", line 334, in _reconstruct
    state = deepcopy(state, memo)
  File "/usr/lib64/python2.7/copy.py", line 163, in deepcopy
    y = copier(x, memo)
  File "/usr/lib64/python2.7/copy.py", line 257, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib64/python2.7/copy.py", line 190, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "/usr/lib64/python2.7/copy.py", line 329, in _reconstruct
    y = callable(*args)
  File "/usr/lib64/python2.7/copy_reg.py", line 93, in __newobj__
    return cls.__new__(cls, *args)
TypeError: object.__new__(thread.lock) is not safe, use thread.lock.__new__()
Command 'instack-install-undercloud' returned non-zero exit status 1
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