bug#39218: 28.0.50; find-dired stopped working

[Michael Heerdegen]

Hello,

`find-dired' stopped working for me.  Backtraces look like this in emacs -Q:

| Debugger entered--Lisp error: (wrong-type-argument processp nil)
|   set-process-filter(nil find-dired-filter)
|   (let ((proc (get-buffer-process (current-buffer)))) (set-process-filter 
proc #'find-dired-filter) (set-process-sentinel proc #'find-dired-sentinel) 
(move-marker (process-mark proc) (point) (current-buffer)))
|   ...
|   find-dired("/my/path/" "-type l ! -readable")
|   (let ((find-program "find")) (find-dired (expand-file-name "..") "-type l ! 
-readable"))

Haven't investigated why this happens, but I can execute `find` in a
shell normally.  However, reverting

2eb0b7835d1a9cd4b804436e33c71058cb38f178
Author:     Tino Calancha <tino.calancha@gmail.com>
AuthorDate: Sun Jan 19 11:13:02 2020 +0100

fixes the issue.


TIA,

Michael.


In GNU Emacs 28.0.50 (build 28, x86_64-pc-linux-gnu, GTK+ Version 3.24.13, 
cairo version 1.16.0)
 of 2020-01-21 built on drachen
Repository revision: dcf2e25c7e0bf6f7d2cc16b48bd49c3f4aa9bc0c
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12006000
System Description: Debian GNU/Linux bullseye/sid