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Help debugging `file-notify-handle-event`
From: |
Alejandro Pérez Carballo |
Subject: |
Help debugging `file-notify-handle-event` |
Date: |
Tue, 8 Nov 2022 20:50:37 -0500 |
Hello,
I've been trying to figure out the source of this recurring error message for
weeks. I thought I had found a bug, but discussion with Michael Albinus after
my bug report made me think I was confused.
https://lists.gnu.org/archive/html/bug-gnu-emacs/2022-11/msg00123.html
The error message I've gotten for months now, often multiple times overnight,
is just this:
file-notify--call-handler: Symbol’s function definition is void: nil
I don't really know what's triggering it, but having once caught a backtrace
(which I failed to save somewhere), I ended up suspecting that the issue was
related to the fact that, just loading this in vanilla Emacs:
```
(require 'filenotify)
(require 'autorevert)
(require 'subr-x)
(global-auto-revert-mode)
(save-window-excursion
(find-file "~/tmp/test.el"))
```
and then running this:
(file-notify--handle-event (car (hash-table-keys file-notify-descriptors))
'(renamed deleted) "/Users/apc/tmp/test.el" nil)
led to the same error:
file-notify--call-handler: Symbol’s function definition is void: nil
But in his follow up to my bug report, Michael suggested that this call
file-notify--handle-event(20 (renamed deleted)
"/Users/apc/org/agenda/work.org" nil)
was invalid (assuming 20 is the descriptor corresponding to the relevant file).
I now have a backtrace to point to, and it does seem that something is causing
that invalid call to be made. My question is: what can I do to figure out
what's triggering it?
---
Debugger entered--Lisp error: (void-function nil)
nil((20 deleted "/Users/apc/org/agenda/work.org"))
file-notify--call-handler(#s(file-notify--watch :directory
"/Users/apc/org/agenda" :filename "work.org" :callback nil) 20 deleted
"/Users/apc/org/agenda/work.org" nil)
file-notify--handle-event(20 (renamed deleted)
"/Users/apc/org/agenda/work.org" nil)
file-notify--callback-kqueue((20 (rename delete)
"/Users/apc/org/agenda/work.org"))
file-notify-handle-event((file-notify (20 (rename delete)
"/Users/apc/org/agenda/work.org") file-notify--callback-kqueue))
funcall-interactively(file-notify-handle-event (file-notify (20 (rename
delete) "/Users/apc/org/agenda/work.org") file-notify--callback-kqueue))
call-interactively(file-notify-handle-event nil [(file-notify (20 (rename
delete) "/Users/apc/org/agenda/work.org") file-notify--callback-kqueue)])
command-execute(file-notify-handle-event nil [(file-notify (20 (rename
delete) "/Users/apc/org/agenda/work.org") file-notify--callback-kqueue)] t)
---
Thanks in advance,
A.
- Help debugging `file-notify-handle-event`,
Alejandro Pérez Carballo <=