>>>  SIGKILL should basically never be used because it's "too strong", only
>>>when no other options work.
> 
> 
>>Isn't that the one the kernel sends during shutdown?
> 
> 
>   Well, during shutdown the kernel first sends SIGTERM to all running
> processes, after which it sends SIGKILL to the remaining. I suppose in
> most cases there aren't any processes running after the former (at least
> if all processes are bug-free and behave correctly) but it's a good way
> to make sure that all processes are truely terminated before shutdown.

That's more of less what I figured, yes. :-)

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