bpo-42406: Fix whichmodule() with multiprocessing (GH-23403)
* bpo-42406: Fix whichmodule() with multiprocessing Signed-off-by: Renato L. de F. Cunha <renatoc@br.ibm.com> Co-authored-by: Gregory P. Smith <greg@krypto.org>
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@ -340,7 +340,9 @@ def whichmodule(obj, name):
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# Protect the iteration by using a list copy of sys.modules against dynamic
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# modules that trigger imports of other modules upon calls to getattr.
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for module_name, module in sys.modules.copy().items():
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if module_name == '__main__' or module is None:
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if (module_name == '__main__'
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or module_name == '__mp_main__' # bpo-42406
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or module is None):
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continue
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try:
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if _getattribute(module, name)[0] is obj:
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@ -0,0 +1,3 @@
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We fixed an issue in `pickle.whichmodule` in which importing
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`multiprocessing` could change the how pickle identifies which module an
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object belongs to, potentially breaking the unpickling of those objects.
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