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Re: How to forcibly abort a command in a terminal window?

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On 9/5/2016 7:28 AM, Henrique de Moraes Holschuh wrote:
> On Mon, 05 Sep 2016, Richard Owlett wrote:
>> I realized I had miss-specified options. As data was multiple GB and target
>> was a USB connected flash drive I wished an immediate termination.
>
> Usually there is no clean way to do this, and you have to wait for the
> process to notice the signal, and abort.
>
>> It seems there should be a better option?
>
> There is none, at least for "cp" and just about everything else that
> does normal writes (i.e. not direct I/O bypassing the kernel page
> cache).
>
> Maybe doing direct I/O using "dd o=direct" with a suitable (not too big)
> buffer size would work differently, but I am not sure about that at all.
>
> Anyway, from what you described, a lot of data to write was already
> submitted by "cp" to the kernel, and the "cp" process would be in "D"
> (uninterruptible sleep) state because it accumulated too many dirty
> pages (pending writes) already and was still trying to queue up more
> writes.
>
> Eventually, the kernel would have flushed enough data to the device and
> would decide to waken "cp" up to get more data to write, at which point
> "cp" would notice the SIGINT from ^C, and abort.  The kernel would
> continue to flush the remaining data that had already been submitted for
> writing, though, so device writes would not immediately stop.
>

Thank you.
Sometimes harware reset is the only thing.
The cp command was crudded up by human error ;/

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Thread

How to forcibly abort a command in a terminal window? Richard Owlett <rowlett@cloud85.net> - 2016-09-05 13:50 +0200
  Re: How to forcibly abort a command in a terminal window? Henrique de Moraes Holschuh <hmh@debian.org> - 2016-09-05 14:30 +0200
    Re: How to forcibly abort a command in a terminal window? Richard Owlett <rowlett@cloud85.net> - 2016-09-05 15:20 +0200
      Re: How to forcibly abort a command in a terminal window? Jonathan Dowland <jmtd@debian.org> - 2016-09-05 15:40 +0200
        Re: How to forcibly abort a command in a terminal window? Richard Owlett <rowlett@cloud85.net> - 2016-09-05 16:10 +0200
          Re: How to forcibly abort a command in a terminal window? Charlie Kravetz <cjk@teamcharliesangels.com> - 2016-09-05 17:10 +0200
            Re: How to forcibly abort a command in a terminal window? Nicolas George <george@nsup.org> - 2016-09-05 17:20 +0200
              Re: How to forcibly abort a command in a terminal window? Dutch Ingraham <stoa@gmx.us> - 2016-09-05 18:20 +0200
                Re: How to forcibly abort a command in a terminal window? Nicolas George <george@nsup.org> - 2016-09-05 18:40 +0200
              Re: How to forcibly abort a command in a terminal window? Charlie Kravetz <cjk@teamcharliesangels.com> - 2016-09-05 18:30 +0200
                Re: How to forcibly abort a command in a terminal window? Vincent Lefevre <vincent@vinc17.net> - 2016-09-05 21:40 +0200

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