hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
30 lines
873 B
Python
30 lines
873 B
Python
"""
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Expose a race in the _warnings module, which is the C backend for the
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warnings module. The "_warnings" module tries to access attributes of the
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"warnings" module (because of the API it has to support), but doing so
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during interpreter shutdown is problematic. Specifically, the call to
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PyImport_GetModuleDict() in Python/_warnings.c:get_warnings_attr will
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abort() if the modules dict has already been cleaned up.
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This crasher is timing-dependent, and more threads (NUM_THREADS) may be
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necessary to expose it reliably on different systems.
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"""
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import threading
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import warnings
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NUM_THREADS = 10
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class WarnOnDel(object):
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def __del__(self):
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warnings.warn("oh no something went wrong", UserWarning)
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def do_work():
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while True:
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w = WarnOnDel()
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for i in range(NUM_THREADS):
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t = threading.Thread(target=do_work)
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t.setDaemon(1)
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t.start()
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