bug#33839: 26.1.90; Emacs occasionally fails to receive asynchronous subprocess output in batch mode

[Eli Zaretskii]

> From: Philipp <p.stephani2@gmail.com>
> Date: Sun, 23 Dec 2018 03:28:53 +0100
> 
> (with-temp-buffer
>   (let ((proc (make-process :name "test"
>                             :command '("bash" "-c" "echo stdout; echo stderr 
> >&2")
>                             :buffer (current-buffer)
>                             :connection-type 'pipe
>                             :sentinel #'ignore
>                             :noquery t
>                             :coding '(utf-8-unix . utf-8-unix))))
>     (when (process-live-p proc)
>       (process-send-eof proc))
>     (while (process-live-p proc)
>       (accept-process-output proc))
>     (cl-assert (equal (buffer-string) "stdout\nstderr\n") :show-args)))
> 
> Then evaluate this form repeatedly.  Occasionally the buffer is empty
> and the assertion triggers.

Isn't there an inherent race condition here?