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Author here, happy to answer any questions about the post.

Is the double meaning of the headline intentional? I was expecting a timing or other attack to determine data has a particular origin..

No it's [probably] not. SIGINT is unfortunately ambiguous, unlike SIGKILL, SIGTERM, SIGQUIT, SIGUSR1. :)

I'd have suggested "missing Ctrl+C" instead (like the title of the bug report.)

As far as I know SIGINT is the name of the signal and Ctrl+C is simply a key combination that triggers it.

I read the title to mean SIGINT the signal and it wasn't until I came to HN comments did I see have another meaning.

Ha, nope, didn't realize this until everyone started mentioning it in the comments.