Michael Albinus <michael.albinus@HIDDEN>
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From: Michael Albinus <michael.albinus@HIDDEN>
To: Al Haji-Ali <abdo.haji.ali@HIDDEN>
Subject: Re: bug#78712: 31.0.50; definition is void in file-notify
In-Reply-To: <m0plfdqptk.fsf@HIDDEN>
References: <m0y0u5tbsj.fsf@HIDDEN> <87bjr1ghle.fsf@HIDDEN>
<m0y0u5rppf.fsf@HIDDEN> <874iwsho9j.fsf@HIDDEN>
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Date: Mon, 09 Jun 2025 13:47:53 +0200
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Al Haji-Ali <abdo.haji.ali@HIDDEN> writes:
Hi,
> I got this.
>
> file-notify-handle-event (file-notify (61 (rename attrib delete) "[redact=
ed-dir]/[redacted-filename]") file-notify--callback-kqueue)
> file-notify-callback 61 deleted "[redacted-dir]/[redacted-filename]" nil =
#s(file-notify--watch "[redacted-dir]" "[redacted-filename]" auto-revert-no=
tify-handler) "[redacted-dir]/[redacted-filename]" "[redacted-dir]"
> file-notify-handle-event (file-notify (61 stopped "[redacted-dir]/[redact=
ed-filename]") auto-revert-notify-handler) [2 times]
> file-notify-callback 61 attribute-changed "[redacted-dir]/[redacted-filen=
ame]" nil #s(file-notify--watch "[redacted-dir]" "[redacted-filename]" nil)=
"[redacted-dir]/[redacted-filename]" "[redacted-dir]"
> file-notify--call-handler: Symbol=E2=80=99s function definition is void: =
nil
>
> Note that while I tested my artificial code on 31.0.50, showing the error=
being thrown, the log above is reported from my daily Emacs 29.1.
> For various reasons I cannot update to the latest version for my daily Em=
acs and as I mentioned the error happens somewhat randomly, so my only real=
chance to catch it is in this emacsen.=20
Well, I haven't seen an action list (rename attrib delete) yet, but it
seems to be legitimate use.
I suppose the appended patch should fix it. It is assembled on top of
Emacs 31, but it should also apply on Emacs 29. Do you have a chance to
test it?
Best regards, Michael.
--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment
Content-Transfer-Encoding: quoted-printable
diff --git a/lisp/filenotify.el b/lisp/filenotify.el
index 9acf7651df5..96c2c46d1df 100644
=2D-- a/lisp/filenotify.el
+++ b/lisp/filenotify.el
@@ -233,16 +233,18 @@ file-notify--call-handler
(and (stringp file1)
(string-equal (file-notify--watch-filename watch)
(file-name-nondirectory file1))))
- (when file-notify-debug
- (message
- "file-notify-callback %S %S %S %S %S %S %S"
- desc action file file1 watch
- (file-notify--watch-absolute-filename watch)
- (file-notify--watch-directory watch)))
- (funcall (file-notify--watch-callback watch)
- (if file1
- (list desc action file file1)
- (list desc action file)))))
+ ;; The callback could have removed in `file-notify--rm-descriptor'.
+ (when (file-notify--watch-callback watch)
+ (when file-notify-debug
+ (message
+ "file-notify-callback %S %S %S %S %S %S %S"
+ desc action file file1 watch
+ (file-notify--watch-absolute-filename watch)
+ (file-notify--watch-directory watch)))
+ (funcall (file-notify--watch-callback watch)
+ (if file1
+ (list desc action file file1)
+ (list desc action file))))))
=20
(defun file-notify--handle-event (desc actions file file1-or-cookie)
"Handle an event returned from file notification.
--=-=-=--
bug-gnu-emacs@HIDDEN:bug#78712; Package emacs.
Full text available.Received: (at 78712) by debbugs.gnu.org; 9 Jun 2025 08:40:12 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Jun 09 04:40:12 2025 Received: from localhost ([127.0.0.1]:53853 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1uOY39-0003ZV-QK for submit <at> debbugs.gnu.org; Mon, 09 Jun 2025 04:40:12 -0400 Received: from mail-wr1-x42b.google.com ([2a00:1450:4864:20::42b]:54585) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from <abdo.haji.ali@HIDDEN>) id 1uOY36-0003Td-R6 for 78712 <at> debbugs.gnu.org; Mon, 09 Jun 2025 04:40:09 -0400 Received: by mail-wr1-x42b.google.com with SMTP id ffacd0b85a97d-3a53ee6fcd5so832988f8f.1 for <78712 <at> debbugs.gnu.org>; Mon, 09 Jun 2025 01:40:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1749458402; x=1750063202; darn=debbugs.gnu.org; h=content-transfer-encoding:mime-version:message-id:date:references :in-reply-to:subject:cc:to:from:from:to:cc:subject:date:message-id :reply-to; bh=THwtM3aII/xLQ5FMO0RVMrmBvXKeMHwXli0CQZVfHuI=; b=incQj9z3GxEubml3LJuQ/Zgu31cG+V1BFnO7DFN+74WnyJvJASgLdCo/jE2E2WwN8u N51HmCOKDgvmUquApHK9mbmduUBFKYmM2I1Ow91lyHtI9deAuKwjNvDnFUlhIP5TMpTN 6HMPVNwDBnRRWfmpLVh9b+EiKlMxW7H9bjEWJ6e7hyXSWF8bBEFgK4AaKMbybr59FPZE f55ENeNwCfM/SB0RdS5sRhuOxv2sAPASmeVoTu1AGmvJQfWRtuu0+yDaccD72JhnK0AT XomrAExnjMhDfO7oxXaDwcXbheGpgAZr5HS3H+XwzBVWq9u/DRifNvluib6RuRxceRse 8TPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749458402; x=1750063202; h=content-transfer-encoding:mime-version:message-id:date:references :in-reply-to:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=THwtM3aII/xLQ5FMO0RVMrmBvXKeMHwXli0CQZVfHuI=; b=eFPTMohgset/yEhFFMra5BUdIlg4LzlaPm2oh+V5S3iNK45JxkaAa10s9T7g/z6S8g gKA1j8gHeMkjtDnff4L4iMdrFsH4m0ko5igIL6kvjABmr5FjomAXQGGUTk5fPaVE6R+o yRY9JtBjOEEiNpTe982a1uymcssqH+nIvqcV1QPpYNJd5iRYwlCZjSLXtwVAneeypqQN On8sjnpwyRg+/i8iPM09QrogetZEvGICJRIPN9Z9OPmKtWXDurHvb/iULOymTLnI2saT xA1Bu7lxWKEvp4QMXQHXp7lgBdt/WPDe/JVEtNXEOPt0yMPMKBaB/dpyAuAlm2L7s1lV 0gpQ== X-Gm-Message-State: AOJu0YxixIbFgurkqoT3DF95n/p32r+oy4imi2f/15GWOSuvldCP5cT6 5pQGh0TneBOZILU2KA0B/RPODkldP0nZ/Du02Kr4eoxku49ZlP2XDB/T X-Gm-Gg: ASbGncsstCggq427a0GtLoKws+K659hq2McITgOEt6FkcqQeFgS9RXaY01zn+mob8Pm UJkbU+S9yTtXCNOtaWdWujIwub0g9tqSpbafGkqrIu0Bkm08aDtOFog9fdA/+JTl/UJa7AAfEDZ Cn6NlIwySL0lfA550LbhUQcL1j20/sFQ+ZfsFJpmGQX4imvRyw1ONs0u8nZeImOJFLyLbKpFlJV aujVe0xcxNSs/nZ6cFxxMcLSfJ2newrAR+EL7dxu559EkOKF/lghOSm+V4Qv0l3p9um1u192c5Q eQLDUvBwdD5cBQiJkMdYJcYavUAH+50uh57eZ6UNxCzRaY5rdWBHKXaqamzLqRd+lSWssKs= X-Google-Smtp-Source: AGHT+IFtiRfBysJctIncrSce/FfOJ4FQn4mT5XI4Ju26dhelpEqMKHCAhi/pOZQalmtADUUpKXPiXg== X-Received: by 2002:a05:6000:2c11:b0:3a4:f00b:69b6 with SMTP id ffacd0b85a97d-3a531cec6d1mr9949950f8f.54.1749458402372; Mon, 09 Jun 2025 01:40:02 -0700 (PDT) Received: from localhost ([137.195.27.88]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4521375a392sm103051075e9.36.2025.06.09.01.40.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Jun 2025 01:40:01 -0700 (PDT) From: Al Haji-Ali <abdo.haji.ali@HIDDEN> To: Michael Albinus <michael.albinus@HIDDEN> Subject: Re: bug#78712: 31.0.50; definition is void in file-notify In-Reply-To: <874iwsho9j.fsf@HIDDEN> References: <m0y0u5tbsj.fsf@HIDDEN> <87bjr1ghle.fsf@HIDDEN> <m0y0u5rppf.fsf@HIDDEN> <874iwsho9j.fsf@HIDDEN> Date: Mon, 09 Jun 2025 09:31:03 +0100 Message-ID: <m0plfdqptk.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 78712 Cc: 78712 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) On 06/06/2025, Michael Albinus wrote: > Well, let's analyze what happens. No artificial test code. Happy to help with this. Just a couple of notes: - If the "error" is the bizarre action sequence, while it is regularly re-p= roduced, I don't know the precise conditions for it so I will have to wait = until it randomly shows up for any debugging. - If the action sequence (rename attrib delete) is an expected one, my "art= ificial" code is just showing that this sequence causes the error to be thr= own due to the logic in the code. > Please set file-notify-debug. We'll see the arrived events then in the > *Message* buffer, like shown in my other message: > > --8<---------------cut here---------------start------------->8--- > file-notify-handle-event (file-notify (6 (rename) "xxx" "yyy") file-notif= y--callback-kqueue) > --8<---------------cut here---------------end--------------->8--- > > Send the event traces. I got this. --8<---------------cut here---------------start------------->8--- file-notify-handle-event (file-notify (61 (rename attrib delete) "[redacted= -dir]/[redacted-filename]") file-notify--callback-kqueue) file-notify-callback 61 deleted "[redacted-dir]/[redacted-filename]" nil #s= (file-notify--watch "[redacted-dir]" "[redacted-filename]" auto-revert-noti= fy-handler) "[redacted-dir]/[redacted-filename]" "[redacted-dir]" file-notify-handle-event (file-notify (61 stopped "[redacted-dir]/[redacted= -filename]") auto-revert-notify-handler) [2 times] file-notify-callback 61 attribute-changed "[redacted-dir]/[redacted-filenam= e]" nil #s(file-notify--watch "[redacted-dir]" "[redacted-filename]" nil) "= [redacted-dir]/[redacted-filename]" "[redacted-dir]" file-notify--call-handler: Symbol=E2=80=99s function definition is void: nil --8<---------------cut here---------------end--------------->8--- Note that while I tested my artificial code on 31.0.50, showing the error b= eing thrown, the log above is reported from my daily Emacs 29.1. For various reasons I cannot update to the latest version for my daily Emac= s and as I mentioned the error happens somewhat randomly, so my only real c= hance to catch it is in this emacsen.=20 > I'd like also to understand what has triggered the (rename attrib > delete) actions combined in one event. Is it related to an edit action > from yourself, or due to the said sync action? Which kind of sync action > is this? I suspect it is triggered by an action of my automatic sync. This is an iCl= oud driver on macOS. I've also seen similar errors on a file in a Dropbox folder (again on macOS= ). > Does the sync action happen on a mounted file system? Yes, the file system should be mounted, I believe. Though I am unclear on t= he internals of an iCloud drive.=20
bug-gnu-emacs@HIDDEN:bug#78712; Package emacs.
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content-type:date:from:message-id:mime-version:reply-to:subject: to; b=gniNJyK0Sgl0A3Y3DY7rIXj9ZLIiRAsL2VvQ62QMxKKNtjqJFCRRIWkNA/D9MOcY pKuXpC6RlAatTn9G9jzGRW6dvmmTjYsxAeEmuaKxCGlKjADxIKZ76k9fqnG9y2gS8 S5ncSjo/5SlqPjwqpinexMBoTVg1SbmkCcWqxNeMK3TSCQSot08EqxgTjoHKnEZqG MbbgsGmYFSXXMkzaNYEfJUDtUojO5/ko1s0pf/F5jeimyUgkdvw5yn14V+xcrgnww xSUU73meWKoOLxpQwyQsN6nKwLeqSIfQ85Xbp801ag5JdEH4C4i5dnAg569z/czAI ewmOrfg6r4U5ie47sQ== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from gandalf.gmx.de ([185.89.37.61]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MIdiZ-1ube4C1Wa5-00F83s; Fri, 06 Jun 2025 17:40:25 +0200 From: Michael Albinus <michael.albinus@HIDDEN> To: Al Haji-Ali <abdo.haji.ali@HIDDEN> Subject: Re: bug#78712: 31.0.50; definition is void in file-notify In-Reply-To: <m0y0u5rppf.fsf@HIDDEN> References: <m0y0u5tbsj.fsf@HIDDEN> <87bjr1ghle.fsf@HIDDEN> <m0y0u5rppf.fsf@HIDDEN> Date: Fri, 06 Jun 2025 17:40:24 +0200 Message-ID: <874iwsho9j.fsf@HIDDEN> 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debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) Al Haji-Ali <abdo.haji.ali@HIDDEN> writes: Hi, > Note that I do not actually call `file-notify-handle-event` > myself. The call-stack I gave is produced regularly yet randomly, on > what I suspect are certain changes to the file under question (the > file is automatically sync'ed so I don't control the changes). > > The code I provided is just something I cobbled together to showcase > that the cause of the error is the action sequence (rename attrib > delete), which seem to be a legitimate sequence based on the > callstack. Well, let's analyze what happens. No artificial test code. Please set file-notify-debug. We'll see the arrived events then in the *Message* buffer, like shown in my other message: --8<---------------cut here---------------start------------->8--- file-notify-handle-event (file-notify (6 (rename) "xxx" "yyy") file-notify--callback-kqueue) --8<---------------cut here---------------end--------------->8--- Send the event traces. I'd like also to understand what has triggered the (rename attrib delete) actions combined in one event. Is it related to an edit action from yourself, or due to the said sync action? Which kind of sync action is this? Does the sync action happen on a mounted file system? Best regards, Michael.
bug-gnu-emacs@HIDDEN:bug#78712; Package emacs.
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The event in the object, file-notify-handle-event is > called with, has only three slots: (63 (rename attrib delete) "[redacted]"). > > Why do you call file-notify-handle-event yourself? It is not intended > for this use case. I am not sure why it's wrong. Happy to debug if given directions. Note that I do not actually call `file-notify-handle-event` myself. The call-stack I gave is produced regularly yet randomly, on what I suspect are certain changes to the file under question (the file is automatically sync'ed so I don't control the changes). The code I provided is just something I cobbled together to showcase that the cause of the error is the action sequence (rename attrib delete), which seem to be a legitimate sequence based on the callstack.
bug-gnu-emacs@HIDDEN:bug#78712; Package emacs.
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X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) Al Haji-Ali <abdo.haji.ali@HIDDEN> writes: Hi, > I am running into an issue (on MacOS) where a file-watcher gets called with a specific set of actions, which lead to the error > > ,---- > | file-notify--call-handler: Symbol's function definition is void: nil > `---- > > Here's the full stack trace: > > ,---- > | Debugger entered--Lisp error: (void-function nil) > | nil((63 attribute-changed "[redacted]")) > | file-notify--call-handler(#s(file-notify--watch :directory "[redacted]" :filename "[redacted]" :callback nil) 63 attribute-changed "[redacted]" nil) > | file-notify--handle-event(63 (renamed attribute-changed deleted) "[redacted]" nil) > | file-notify--callback-kqueue((63 (rename attrib delete) "[redacted]")) > | file-notify-handle-event((file-notify (63 (rename attrib delete) "[redacted]") file-notify--callback-kqueue)) > | funcall-interactively(file-notify-handle-event (file-notify (63 (rename attrib delete) "[redacted]") file-notify--callback-kqueue)) > | command-execute(file-notify-handle-event nil [(file-notify (63 (rename attrib delete) "[redacted]") file-notify--callback-kqueue)] t) > `---- --8<---------------cut here---------------start------------->8--- > | file-notify-handle-event((file-notify (63 (rename attrib delete) "[redacted]") file-notify--callback-kqueue)) --8<---------------cut here---------------end--------------->8--- This looks wrong. The event in the object, file-notify-handle-event is called with, has only three slots: (63 (rename attrib delete) "[redacted]"). There must be 4 slots, like in (tested on my FreeBDS14 VM): --8<---------------cut here---------------start------------->8--- file-notify-handle-event((file-notify (6 (rename) "xxx" "yyy") file-notify--callback-kqueue)) --8<---------------cut here---------------end--------------->8--- > and here's some code that replicates the error (I can't figure out now to replicate the event itself) > > (let* ((desc (car (hash-table-keys file-notify-descriptors))) > (watch (gethash desc file-notify-descriptors)) > (action '(rename atttrib delete))) > (when desc > (file-notify-handle-event > (make-file-notify > :-event (list desc action (file-notify--watch-absolute-filename watch)) > :-callback 'file-notify--callback-kqueue)))) > > assuming that `file-notify-descriptors` has some entries (enabling `global-auto-revert-mode` would add such entries). So you must update the :-event slot. Why do you call file-notify-handle-event yourself? It is not intended for this use case.
bug-gnu-emacs@HIDDEN:bug#78712; Package emacs.
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From: Al Haji-Ali <abdo.haji.ali@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.0.50; definition is void in file-notify
Date: Fri, 06 Jun 2025 11:16:44 +0100
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I am running into an issue (on MacOS) where a file-watcher gets called with a specific set of actions, which lead to the error
,----
| file-notify--call-handler: Symbol's function definition is void: nil
`----
Here's the full stack trace:
,----
| Debugger entered--Lisp error: (void-function nil)
| nil((63 attribute-changed "[redacted]"))
| file-notify--call-handler(#s(file-notify--watch :directory "[redacted]" :filename "[redacted]" :callback nil) 63 attribute-changed "[redacted]" nil)
| file-notify--handle-event(63 (renamed attribute-changed deleted) "[redacted]" nil)
| file-notify--callback-kqueue((63 (rename attrib delete) "[redacted]"))
| file-notify-handle-event((file-notify (63 (rename attrib delete) "[redacted]") file-notify--callback-kqueue))
| funcall-interactively(file-notify-handle-event (file-notify (63 (rename attrib delete) "[redacted]") file-notify--callback-kqueue))
| command-execute(file-notify-handle-event nil [(file-notify (63 (rename attrib delete) "[redacted]") file-notify--callback-kqueue)] t)
`----
and here's some code that replicates the error (I can't figure out now to replicate the event itself)
--8<---------------cut here---------------start------------->8---
(let* ((desc (car (hash-table-keys file-notify-descriptors)))
(watch (gethash desc file-notify-descriptors))
(action '(rename atttrib delete)))
(when desc
(file-notify-handle-event
(make-file-notify
:-event (list desc action (file-notify--watch-absolute-filename watch))
:-callback 'file-notify--callback-kqueue))))
--8<---------------cut here---------------end--------------->8---
assuming that `file-notify-descriptors` has some entries (enabling `global-auto-revert-mode` would add such entries).
The issues seems to be that when processing the first action (`rename`), the function `file-notify--handle-event` treats it as 'delete' which calls `file-notify-rm-watch` which calls `file-notify--rm-descriptor` which has the line `(setf
(file-notify--watch-callback watch) nil)`
This modifies the hash to have a nil handler, which trips up
`file-notify--handle-event` when the actual `delete` event is processed.
The same effect can be seen if the actions are (rename delete) or (delete delete).
Al Haji-Ali <abdo.haji.ali@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#78712; Package emacs.
Full text available.
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