GNU bug report logs - #72641
31.0.50; "Unlocking file: Invalid argument" when deleting lock file on network file system

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Duncan Greatwood <dgreatwood <at> gmail.com>
Subject: bug#70973: closed (Re: bug#72641: 31.0.50; "Unlocking file:
 Invalid argument" when deleting lock file on network file system)
Date: Sun, 18 Aug 2024 21:27:02 +0000

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Your bug report

#72641: 29.1; "Unlocking file: Invalid argument" Warning saving via a softlink with stale file lock

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 70973 <at> debbugs.gnu.org.

-- 
72641: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=72641
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Michal Nazarewicz <mina86 <at> mina86.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 72641-done <at> debbugs.gnu.org
Subject: Re: bug#72641: 31.0.50; "Unlocking file: Invalid argument" when
 deleting lock file on network file system
Date: Sun, 18 Aug 2024 14:25:43 -0700

On 2024-08-18 14:15, Michal Nazarewicz wrote:
> On Sat, Aug 17 2024, Paul Eggert wrote:
>> Yes, it's definitely a file system bug, and I don't see any good way
>> for Emacs to work around it.
> 
> Yeah, I think this bug can be close.  Though if you think the patch I’ve
> sent makes sense, I can push it to master as well.
> 

OK, closing the bug report, as the patch you sent in 
<https://bugs.gnu.org/72641#16> is problematic for the reasons discussed 
in <https://bugs.gnu.org/72641#19>.

[Message part 3 (message/rfc822, inline)]

From: Duncan Greatwood <dgreatwood <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.1; "Unlocking file: Invalid argument" Warning saving via a
 softlink with stale file lock
Date: Wed, 15 May 2024 17:53:05 -0700

[Message part 4 (text/plain, inline)]

While editing the ~/.emacs file in emacs, the machine rebooted (kernel
panic I believe). This left a lock file behind.

The ~/.emacs file is actually a softlink:
.emacs -> /Users/<username>/Dropbox/Documents/Projects/emacs/dotemacs
The fact that it's a softlink may or may not be relevant.

In ~/Dropbox/Documents/Projects/emacs/, there was a file: .#dotemacs

After the reboot, I started emacs, and continued with further edits to
.emacs. Upon saving .emacs, had the following warning:
⛔ Warning (unlock-file): Unlocking file: Invalid
argument, ~/Dropbox/Documents/Projects/emacs/dotemacs, ignored

As per the warning, the save was nonetheless successful.

Invoking file-locked-p directly, I saw the same error, and the following
debug info:
Debugger entered--Lisp error: (file-error "Testing file lock" "Invalid
argument" "~/Dropbox/Documents/Projects/emacs/dotemacs")
  file-locked-p("~/Dropbox/Documents/Projects/emacs/dotemacs")
  eval((file-locked-p "~/Dropbox/Documents/Projects/emacs/dotemacs") t)
  eval-expression((file-locked-p
"~/Dropbox/Documents/Projects/emacs/dotemacs") nil nil 127)
  funcall-interactively(eval-expression (file-locked-p
"~/Dropbox/Documents/Projects/emacs/dotemacs") nil nil 127)
  call-interactively(eval-expression nil nil)
  command-execute(eval-expression)

After removing the lock file manually, the warning on save goes away:
rm ~/Dropbox/Documents/Projects/emacs/.#dotemacs

Access flags on dotemacs file are as follows:
-rw-r--r--@  1 dgreatwood  staff  133806 May 15 16:01 dotemacs
lrwxr-xr-x  1 dgreatwood  staff  59 Dec  6  2015 .emacs -> ...

Thanks.
----
In GNU Emacs 29.1 (build 1, aarch64-apple-darwin21.6.0, NS
 appkit-2113.60 Version 12.6.6 (Build 21G646)) of 2023-08-16 built on
 armbob.lan
Windowing system distributor 'Apple', version 10.3.2487
System Description:  macOS 14.5

Configured using:
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hides
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hides
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/Users/username/.emacs.d/lisp/linum hides
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Memory information:
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 (symbols 48 26631 1)
 (strings 32 138327 48200)
 (string-bytes 1 3541370)
 (vectors 16 50914)
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