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[3.7] bpo-42406: Fix whichmodule() with multiprocessing (pythonGH-23403) #28489

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[3.7] bpo-42406: Fix whichmodule() with multiprocessing (pythonGH-23403) #28489

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4 changes: 3 additions & 1 deletion Lib/pickle.py
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Original file line number Diff line number Diff line change
Expand Up @@ -307,7 +307,9 @@ def whichmodule(obj, name):
# Protect the iteration by using a list copy of sys.modules against dynamic
# modules that trigger imports of other modules upon calls to getattr.
for module_name, module in list(sys.modules.items()):
if module_name == '__main__' or module is None:
if (module_name == '__main__'
or module_name == '__mp_main__' # bpo-42406
or module is None):
continue
try:
if _getattribute(module, name)[0] is obj:
Expand Down