Ah sorry, I forgot to use emacs -Q again. I guess I have to find the issue
myself.

On Sun, Jul 7, 2019 at 11:20 AM Michael Albinus <michael.albinus@gmx.de>
wrote:

> Fritz Stelzer <brotzeitmacher@gmail.com> writes:
>
> Hi Fritz,
>
> > When I use `async-shell-command` on a remote host I get this error if
> > there's already the
> > *Async Shell Command* buffer. When there's a running process and I
> > confirm to kill the process, it works. It seems to work correctly for
> > `shell-command`.
> > I didn't have any issues while trying this locally. I'm on d07dd64fd0.
>
> I cannot reproduce it locally. Scenario:
>
> - emacs -Q /ssh::
>
> - M-& sleep 600
>
> - M-& sleep 600
>
> I get the message "A command is running in the default buffer.  Use a
> new buffer? (yes or no) " If I enter "yes", it opens a second buffer
> *Async Shell Command*<2>. If I enter "no", there is the error message
> "tramp-error: Shell command in progress" in the *Messages* buffer, which
> is likely OK.
>
> The same happens if I run it on a local buffer, but in the "no" case the
> error message is "shell-command: Shell command in progress".
>
> Arguably, there shouldn't be an error but a user error, but I don't see
> anything else. What's the difference in your use case?
>
> If you still see something strange, could you run your scenario with
> tramp-verbose set to 10, and send us the Tramp debug buffer?
>
> Best regards, Michael.
>