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The tp_name field in thread.LockType is set as "thread.lock". This is incorrect and conflicts with the value set in dummy_thread.
Python 2.7.6 (default, Sep 9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
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>>> import thread
>>> import dummy_thread
>>> thread.LockType.__name__
'lock'
>>> dummy_thread.LockType.__name__
'LockType'
Code which depends on the ability to look up a class based on module and name (see the following code taken from pickle.py) breaks due to this behavior, so my preferred fix would be to change tp_name to a value consistent with dummy_thread.
try:
 __import__(module)
 mod = sys.modules[module]
 klass = getattr(mod, name)
except (ImportError, KeyError, AttributeError):
 raise PicklingError(
 "Can't pickle %r: it's not found as %s.%s" %
 (obj, module, name))
Happy to submit a patch if someone could confirm.