Subject: bug#49682: 27.2.50; accept-process-output within accept-process-output hangs emacs

From: Dmitry Gutov <[email-masked]>
Date: Mon, 26 Jul 2021 21:58:39 +0300

On 23.07.2021 20:00, Rajeev N via Bug reports for GNU Emacs, the Swiss 
army knife of text editors wrote:
> (let ()
>    (run-with-timer 0 nil #'url-retrieve"https://www.gnu.org/"  #'ignore)
>    (make-process :name "echo" :command '("echo")
>     :sentinel (lambda (_p _e) (run-with-timer 0 nil #'diary-mail-entries))))

Any chance you have an example of the problem that doesn't require 
SMTP/Mail/Gnus to be configured in Emacs?