bug#70973: 29.1; "Unlocking file: Invalid argument" Warning saving via a softlink with stale file lock

[Duncan Greatwood <dgreatwood@gmail.com>]

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> If you can reproduce the problem, please tell what does
>
>   ls -l ~/Dropbox/Documents/Projects/emacs/.#dotemacs
>
> produce when you see the warnings

As follows:
$ ls -l ~/Dropbox/Documents/Projects/emacs/.#dotemacs
-rw-r--r--@ 1 username  staff  0 May 16 07:13
/Users/username/Dropbox/Documents/Projects/emacs/.#dotemacs


On Thu, May 16, 2024 at 1:43 AM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Duncan Greatwood <dgreatwood@gmail.com>
> > Date: Wed, 15 May 2024 17:53:05 -0700
> >
> > 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.
>
> However, this doesn't provide enough information to investigate the
> issue and its causes.  If you can reproduce the problem, please tell
> what does
>
>   ls -l ~/Dropbox/Documents/Projects/emacs/.#dotemacs
>
> produce when you see the warnings, because that is the immediate
> trigger for the "invalid argument".
>

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