GNU bug report logs - #47461
27.2; Cannot delete windows due to some trouble with markers

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.2; Cannot delete windows due to some trouble with markers
Date: Mon, 29 Mar 2021 12:00:22 +0300

I don't have a reproducer, since I don't know yet why would some
marker in some buffer become invalid.

However, given that this does happen for some reason, I am unable to
delete windows via "C-x 1" and "C-x 0", due to this part of
delete-window:

  (interactive)
  (when switch-to-buffer-preserve-window-point
    (window--before-delete-windows))  <<<<<<<<<<<<<<<<<<<<<<

(Recall that switch-to-buffer-preserve-window-point is nowadays t by
default.)

What happens is that window--before-delete-windows works with markers,
and if that signals an error, the whole command is aborted.  All you
get is this unhelpful error message:

  Marker does not point anywhere

Fortunately, mouse-delete-window and mouse-delete-other-windows don't
have the code shown above, so I was able to work around the problem by
using those mouse commands.  Another workaround is to temporarily
reset switch-to-buffer-preserve-window-point, but that is only
apparent if you read the code and realize or know that
window--before-delete-windows is the one that signals the error.

Should we perhaps run this with demoted errors in the interactive
case, so that users aren't locked when something like that happens?

(I will try to figure out which marker becomes invalid and why.)

In GNU Emacs 27.2 (build 2, i686-pc-mingw32)
 of 2021-03-25 built on HOME-C4E4A596F7
Windowing system distributor 'Microsoft Corp.', version 5.1.2600
System Description: Microsoft Windows XP Service Pack 3 (v5.1.0.2600)

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure -C --prefix=/d/usr --with-wide-int 'CFLAGS=-O2 -gdwarf-4
 -g3''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY W32NOTIFY ACL GNUTLS LIBXML2
HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1255

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
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jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads w32notify w32 lcms2 multi-tty make-network-process
emacs)

Memory information:
((conses 16 50567 10691)
 (symbols 48 7168 1)
 (strings 16 18854 2188)
 (string-bytes 1 533195)
 (vectors 16 9556)
 (vector-slots 8 128347 7168)
 (floats 8 21 169)
 (intervals 40 255 69)
 (buffers 888 11))

Message #8 received at 47461 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 47461 <at> debbugs.gnu.org
Subject: Re: bug#47461: 27.2; Cannot delete windows due to some trouble with
 markers
Date: Tue, 28 Jun 2022 15:45:25 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> I don't have a reproducer, since I don't know yet why would some
> marker in some buffer become invalid.
>
> However, given that this does happen for some reason, I am unable to
> delete windows via "C-x 1" and "C-x 0", due to this part of
> delete-window:
>
>   (interactive)
>   (when switch-to-buffer-preserve-window-point
>     (window--before-delete-windows))  <<<<<<<<<<<<<<<<<<<<<<

This code no longer seems to exist, so perhaps this is no longer an
issue?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 47461 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 47461 <at> debbugs.gnu.org
Subject: Re: bug#47461: 27.2; Cannot delete windows due to some trouble with
 markers
Date: Wed, 27 Jul 2022 12:00:11 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

>> I don't have a reproducer, since I don't know yet why would some
>> marker in some buffer become invalid.
>>
>> However, given that this does happen for some reason, I am unable to
>> delete windows via "C-x 1" and "C-x 0", due to this part of
>> delete-window:
>>
>>   (interactive)
>>   (when switch-to-buffer-preserve-window-point
>>     (window--before-delete-windows))  <<<<<<<<<<<<<<<<<<<<<<
>
> This code no longer seems to exist, so perhaps this is no longer an
> issue?

This was a month ago -- Eli, are you still seeing these issues?

Message #18 received at 47461-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 47461-done <at> debbugs.gnu.org
Subject: Re: bug#47461: 27.2; Cannot delete windows due to some trouble with
 markers
Date: Wed, 27 Jul 2022 14:47:09 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: 47461 <at> debbugs.gnu.org
> Date: Wed, 27 Jul 2022 12:00:11 +0200
> 
> Lars Ingebrigtsen <larsi <at> gnus.org> writes:
> 
> >> I don't have a reproducer, since I don't know yet why would some
> >> marker in some buffer become invalid.
> >>
> >> However, given that this does happen for some reason, I am unable to
> >> delete windows via "C-x 1" and "C-x 0", due to this part of
> >> delete-window:
> >>
> >>   (interactive)
> >>   (when switch-to-buffer-preserve-window-point
> >>     (window--before-delete-windows))  <<<<<<<<<<<<<<<<<<<<<<
> >
> > This code no longer seems to exist, so perhaps this is no longer an
> > issue?
> 
> This was a month ago -- Eli, are you still seeing these issues?

No.  But it's very rare, so I don't know.

However, if the code in question no longer exists, I guess it's okay
to close.  Done.

Thanks.

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