GNU bug report logs - #58954
28.2; ibuffer.el out of range error on lots of buffers?

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

From: "Chris Hecker" <checker <at> d6.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.2; ibuffer.el out of range error on lots of buffers?
Date: Tue, 01 Nov 2022 22:39:16 +0000

I was getting Args out of range: #<buffer *Ibuffer*>, 51267, 51313
when hitting C-x C-b with a ton of buffers open, lots of tramp buffers,
some eww buffers, etc.

 722 buffers    86533321   669 files, 2 processes

It's too much for me to try to repro for me right now with emacs -Q, but
hopefully this will help:

I debugged it to line 1980 in release 28.2 ibuffer.el in function
ibuffer-map-lines:

   (delete-region (line-beginning-position)
       (1+ (line-end-position)))

(line-end-position) evaluated to the end of the buffer, so 1+'ing it
made delete-region error.  Changing it to:

   (delete-region (line-beginning-position)
       (min (point-max) (1+ (line-end-position))))

made ibuffer work again.  I didn't look to closely to know if this was
the result of some logic error earlier in the function, or if this 
should have a
min guard on it normally or what.

Thanks,
Chris



In GNU Emacs 28.2 (build 2, x86_64-w64-mingw32)
 of 2022-09-13 built on AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.19044
System Description: Microsoft Windows 10 Home (v10.0.2009.19044.2130)

Configured using:
 'configure --with-modules --without-dbus --with-native-compilation
 --without-compress-install CFLAGS=-O2'

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

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: IBuffer

Minor modes in effect:
  minibuffer-depth-indicate-mode: t
  icicle-mode: t
  which-function-mode: t
  shell-dirtrack-mode: t
  winner-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-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
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t

Load-path shadows:
~/emacs/lisp/json hides 
c:/apps/emacs/emacs-28.2/share/emacs/28.2/lisp/json
~/emacs/lisp/css-mode hides 
c:/apps/emacs/emacs-28.2/share/emacs/28.2/lisp/textmodes/css-mode

Features:
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Memory information:
((conses 16 7324264 558950)
 (symbols 48 73599 22)
 (strings 32 391231 65833)
 (string-bytes 1 18333786)
 (vectors 16 291582)
 (vector-slots 8 6987527 568250)
 (floats 8 3204 1878)
 (intervals 56 852060 17750)
 (buffers 992 794))

Message #8 received at 58954 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Chris Hecker <checker <at> d6.com>, 58954 <at> debbugs.gnu.org
Subject: Re: bug#58954: 28.2; ibuffer.el out of range error on lots of buffers?
Date: Wed, 2 Nov 2022 06:03:01 -0700

"Chris Hecker" <checker <at> d6.com> writes:

> I was getting Args out of range: #<buffer *Ibuffer*>, 51267, 51313
> when hitting C-x C-b with a ton of buffers open, lots of tramp
> buffers, some eww buffers, etc.
>
>   722 buffers 86533321 669 files, 2 processes

I can't reproduce that here.

> It's too much for me to try to repro for me right now with emacs -Q,
> but hopefully this will help:
>
> I debugged it to line 1980 in release 28.2 ibuffer.el in function
> ibuffer-map-lines:
>
>     (delete-region (line-beginning-position)
>         (1+ (line-end-position)))
>
> (line-end-position) evaluated to the end of the buffer, so 1+'ing it
> made delete-region error.  Changing it to:
>
>     (delete-region (line-beginning-position)
>         (min (point-max) (1+ (line-end-position))))
>
> made ibuffer work again.  I didn't look to closely to know if this was
> the result of some logic error earlier in the function, or if this
> should have a min guard on it normally or what.

The fix looks simple enough, but I'm uneasy about it.

`ibuffer-map-lines' seems to be mapping over buffers in *Ibuffer*, but
the last line in that buffer is not a buffer.  I have:

     600 buffers 44145326 489 files, 1 process

So my question is why `ibuffer-map-lines' is mapping over that last line
in your case?  Could you perhaps try stepping through this function
using edebug to figure out what might be going on?

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