New submission from Simon Percivall:
When called by `_create_pseudo_member_()`, the dictionary iteration of
`_value2member_map` in `_decompose()` in enum.py may lead to a "RuntimeError:
dictionary changed size during iteration". For me, it happened in `re.compile`.
```
Traceback (most recent call last):
...
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/re.py",
line 233, in compile
return _compile(pattern, flags)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/re.py",
line 301, in _compile
p = sre_compile.compile(pattern, flags)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sre_compile.py",
line 562, in compile
p = sre_parse.parse(p, flags)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sre_parse.py",
line 866, in parse
p.pattern.flags = fix_flags(str, p.pattern.flags)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sre_parse.py",
line 835, in fix_flags
flags |= SRE_FLAG_UNICODE
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/enum.py",
line 794, in __or__
result = self.__class__(self._value_ | self.__class__(other)._value_)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/enum.py",
line 291, in __call__
return cls.__new__(cls, value)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/enum.py",
line 533, in __new__
return cls._missing_(value)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/enum.py",
line 760, in _missing_
new_member = cls._create_pseudo_member_(value)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/enum.py",
line 769, in _create_pseudo_member_
_, extra_flags = _decompose(cls, value)
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/enum.py",
line 849, in _decompose
for v, m in flag._value2member_map_.items()
File
"/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/enum.py",
line 848, in <listcomp>
(m, v)
RuntimeError: dictionary changed size during iteration
```
----------
messages: 284724
nosy: simon.percivall
priority: normal
severity: normal
status: open
title: Race condition in enum.py:_decompose()
type: crash
versions: Python 3.6, Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29167>
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