Serhiy Storchaka added the comment:
Before committing any solution we first should have understood the cause of the
crash. The peculiarity of example ctypes_crash.py is that the argument of
ctypes.c_char.from_buffer is a memoryview. With current code we have following
chain (the list creates a reference loop with itself):
list->memoryview->ManagedBuffer->memoryview->ManagedBuffer->bytearray
Using PyMemoryView_FromObject or hypothetical PyMemoryView_FromObjectEx we
could get shorter chain:
list->memoryview->ManagedBuffer->bytearray
May be the cause not in current hack, but in memoryview that can't survive with
breaking long chain? Or may be we just are lucky in latter case?
I share Martin's doubts about writability in Eryksun’s patch.
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<http://bugs.python.org/issue25498>
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