Martin Panter added the comment:
Quentin, do you think this should be reopened?
Brett Cannon, I wonder if the only reason you closed this bug is because you
thought the scenario to trigger it is very unlikely. Considering it affected
someone else, and that there are other real-world triggers in addition to Py
Socks, would it be okay to reopen it? I could try to make a patch or some
concrete suggestions when I have a chance, if that helps change your mind :)
Perhaps a regression test could be based on this experiment:
>>> import sys, warnings
>>> sys.meta_path = None
>>> sys.modules.pop("linecache", None)
<module 'linecache' from '/usr/lib/python3.4/linecache.py'>
>>> warnings.warn("boom")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.4/warnings.py", line 15, in showwarning
file.write(formatwarning(message, category, filename, lineno, line))
File "/usr/lib/python3.4/warnings.py", line 21, in formatwarning
import linecache
File "/home/proj/python/lib/misc.py", line 41, in __call__
return self.__wrapped__(name, globals, locals, fromlist, level)
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2222, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 2150, in _find_spec
File "/usr/lib/python3.4/warnings.py", line 15, in showwarning
file.write(formatwarning(message, category, filename, lineno, line))
. . .
File "<frozen importlib._bootstrap>", line 2236, in _find_and_load
RuntimeError: maximum recursion depth exceeded while calling a Python object
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21049>
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