I added a yolo "delete" statement to destroy an object that was being created a lot, probably couldn't be used anymore, and would *eventually* be deleted, and the problem went away for long enough for an order of more magnitude to be done before the inevitable segfault.
I think this means that if I can just clean it up responsibly, all will be well, but that might be outside the range of how much C++ I can pick up in a weekend.
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The second time, I asked for a memory dump without thinking -- yolo-pasting values from elsewhere -- and GDB crashed rather than try to allocate 30TB.