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will still be performed if something in a backend process calls exit() directly, instead of going through proc_exit() as we prefer. This is a second response to the issue that we might load third-party code that doesn't know it should not call exit(). Such a call will now cause a reasonably graceful backend shutdown, if possible. (Of course, if the reason for the exit() call is out-of-memory or some such, we might not be able to recover, but at least we will try.)