Mike Frysinger added the comment:
the original report on our side w/bunches of tracebacks: http://crbug.com/481223
with that traceback in hand, it's pretty trivial to write a reproduction :).
attached!
i couldn't figure out how to make it work w/out completely execing a new python
instance. i suspect the internals were communicating and thus defeating the
race.
the unshare() might need some checks so that it skips on older kernels or ones
with pidns support disabled. but i don't have any such system anymore ;).
if all goes well, it should fail fairly quickly:
$ python3.3 ./test.py
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib64/python3.3/multiprocessing/__init__.py", line 187, in Event
return Event()
File "/usr/lib64/python3.3/multiprocessing/synchronize.py", line 293, in
__init__
self._cond = Condition(Lock())
File "/usr/lib64/python3.3/multiprocessing/synchronize.py", line 174, in
__init__
self._wait_semaphore = Semaphore(0)
File "/usr/lib64/python3.3/multiprocessing/synchronize.py", line 84, in
__init__
SemLock.__init__(self, SEMAPHORE, value, SEM_VALUE_MAX)
File "/usr/lib64/python3.3/multiprocessing/synchronize.py", line 48, in
__init__
sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)
FileExistsError: [Errno 17] File exists
failed
and doesn't take that long to pass:
$ time python3.4 ./test-issue24303.py
passed!
real 0m1.715s
----------
Added file: http://bugs.python.org/file39594/test-issue24303.py
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