This is also useful if something is making Emacs slow. SIGUSR2 gives you a traceback, whereas C-g just stops whatever it is. https://twitter.com/_wilfredh/status/659499112677642242
miniblog.
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Emacs tip: If your instance hangs and won't respond to C-g, you can use `pkill -SIGUSR2 emacs` to force emacs to stop whatever it's doing.