GNU bug report logs - #52947
29.0.50; Newline in tab-bar-format causes lockup

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

From: Dustin Lacewell <dlacewell <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Newline in tab-bar-format causes lockup
Date: Sun, 2 Jan 2022 04:17:07 -0600

[Message part 1 (text/plain, inline)]

Execute the following elisp:

#+begin_src emacs-lisp
  (defun broken-tab-bar-format ()
    (let* ((str (format "%s \n %s"
                        "foo" "bar")))
      `((global menu-item ,(s-trim str) ignore))))

  (progn
    (setq tab-bar-format '(tab-bar-format-align-right
broken-tab-bar-format))
    (tab-bar-mode 1))
#+end_src

Emacs will lockup and spin the core it's on.

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30,
cairo version 1.16.0)
Repository revision: af729b1dfd235de400f6a0998a968222417596bf
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: NixOS 22.05 (Quokka)

Configured using:
 'configure
 --prefix=/nix/store/mvjig9116v5qx684c99lhzpcbmq177qi-emacs-git-20220102.0
 --disable-build-details --with-modules --with-x-toolkit=gtk3 --with-xft
 --with-cairo'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Dashboard

Minor modes in effect:
  winner-mode: t
  treemacs-project-follow-mode: t
  treemacs-filewatch-mode: t
  treemacs-follow-mode: t
  treemacs-git-mode: t
  treemacs-fringe-indicator-mode: t
  persistent-scratch-autosave-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  helm-mode: t
  helm-minibuffer-history-mode: t
  shell-dirtrack-mode: t
  helm--remap-mouse-mode: t
  async-bytecomp-package-mode: t
  override-global-mode: t
  global-company-mode: t
  company-mode: t
  which-key-mode: t
  electric-pair-mode: t
  global-whitespace-mode: t
  doom-modeline-mode: t
  global-visual-fill-column-mode: 1
  recentf-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-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
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

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Memory information:
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 (vectors 16 94626)
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[Message part 2 (text/html, inline)]

Message #8 received at 52947 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Dustin Lacewell <dlacewell <at> gmail.com>
Cc: 52947 <at> debbugs.gnu.org
Subject: Re: bug#52947: 29.0.50; Newline in tab-bar-format causes lockup
Date: Sun, 02 Jan 2022 19:47:14 +0200

> Execute the following elisp:

Thanks for the bug report.

> #+begin_src emacs-lisp
>   (defun broken-tab-bar-format ()
>     (let* ((str (format "%s \n %s"
>                         "foo" "bar")))
>       `((global menu-item ,(s-trim str) ignore))))

This also can be reproduced without s-trim, with just:

       `((global menu-item ,str ignore))))

>   (progn
>     (setq tab-bar-format '(tab-bar-format-align-right
> broken-tab-bar-format))
>     (tab-bar-mode 1))
> #+end_src
>
> Emacs will lockup and spin the core it's on.

If the display engine doesn't support newlines in the
menu-bar/tool-bar/tab-bar, then we could simply remove newlines
before feeding the tab-bar items to the display engine.

Message #11 received at 52947 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Juri Linkov <juri <at> linkov.net>
Cc: 52947 <at> debbugs.gnu.org, dlacewell <at> gmail.com
Subject: Re: bug#52947: 29.0.50; Newline in tab-bar-format causes lockup
Date: Sun, 02 Jan 2022 20:25:08 +0200

> From: Juri Linkov <juri <at> linkov.net>
> Date: Sun, 02 Jan 2022 19:47:14 +0200
> Cc: 52947 <at> debbugs.gnu.org
> 
> > #+begin_src emacs-lisp
> >   (defun broken-tab-bar-format ()
> >     (let* ((str (format "%s \n %s"
> >                         "foo" "bar")))
> >       `((global menu-item ,(s-trim str) ignore))))
> 
> This also can be reproduced without s-trim, with just:
> 
>        `((global menu-item ,str ignore))))
> 
> >   (progn
> >     (setq tab-bar-format '(tab-bar-format-align-right
> > broken-tab-bar-format))
> >     (tab-bar-mode 1))
> > #+end_src
> >
> > Emacs will lockup and spin the core it's on.
> 
> If the display engine doesn't support newlines in the
> menu-bar/tool-bar/tab-bar, then we could simply remove newlines
> before feeding the tab-bar items to the display engine.

Do we want to support newlines there? what would be the purpose of
having newlines in the tabs?

Also, you say "display engine", so does it mean you've found where we
infloop with these recipes?  If so, can you tell the details?

Thanks.

Message #14 received at 52947 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 52947 <at> debbugs.gnu.org, dlacewell <at> gmail.com
Subject: Re: bug#52947: 29.0.50; Newline in tab-bar-format causes lockup
Date: Sun, 02 Jan 2022 20:38:31 +0200

> Do we want to support newlines there? what would be the purpose of
> having newlines in the tabs?

I don't know, menus can't have newlines too.

> Also, you say "display engine", so does it mean you've found where we
> infloop with these recipes?  If so, can you tell the details?

It gives such backtrace:

(gdb) bt
#0  make_lisp_symbol (sym=0x555555cfd9c0 <lispsym>) at lisp.h:1002
#1  0x00005555555b9766 in builtin_lisp_symbol (index=0) at lisp.h:1008
#2  0x00005555555b9cf6 in CHAR_TABLE_REF_ASCII (ct=XIL(0x7ffff0b438dd), idx=10) at lisp.h:2031
#3  0x00005555555b9d3e in CHAR_TABLE_REF (ct=XIL(0x7ffff0b438dd), idx=10) at lisp.h:2042
#4  0x00005555555d16de in lookup_glyphless_char_display (c=10, it=0x7fffffff75d0) at xdisp.c:7410
#5  0x00005555555d1f8c in get_next_display_element (it=0x7fffffff75d0) at xdisp.c:7599
#6  0x00005555555e3133 in display_tab_bar_line (it=0x7fffffff75d0, height=-1) at xdisp.c:13389
#7  0x00005555555e3901 in tab_bar_height (f=0x5555560a2dc8, n_rows=0x5555560a2f08, pixelwise=true) at xdisp.c:13515
#8  0x00005555555e3c27 in redisplay_tab_bar (f=0x5555560a2dc8) at xdisp.c:13597

Message #17 received at 52947 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Juri Linkov <juri <at> linkov.net>
Cc: 52947 <at> debbugs.gnu.org, dlacewell <at> gmail.com
Subject: Re: bug#52947: 29.0.50; Newline in tab-bar-format causes lockup
Date: Sun, 02 Jan 2022 21:38:03 +0200

> From: Juri Linkov <juri <at> linkov.net>
> Cc: dlacewell <at> gmail.com,  52947 <at> debbugs.gnu.org
> Date: Sun, 02 Jan 2022 20:38:31 +0200
> 
> > Do we want to support newlines there? what would be the purpose of
> > having newlines in the tabs?
> 
> I don't know, menus can't have newlines too.
> 
> > Also, you say "display engine", so does it mean you've found where we
> > infloop with these recipes?  If so, can you tell the details?
> 
> It gives such backtrace:
> 
> (gdb) bt
> #0  make_lisp_symbol (sym=0x555555cfd9c0 <lispsym>) at lisp.h:1002
> #1  0x00005555555b9766 in builtin_lisp_symbol (index=0) at lisp.h:1008
> #2  0x00005555555b9cf6 in CHAR_TABLE_REF_ASCII (ct=XIL(0x7ffff0b438dd), idx=10) at lisp.h:2031
> #3  0x00005555555b9d3e in CHAR_TABLE_REF (ct=XIL(0x7ffff0b438dd), idx=10) at lisp.h:2042
> #4  0x00005555555d16de in lookup_glyphless_char_display (c=10, it=0x7fffffff75d0) at xdisp.c:7410
> #5  0x00005555555d1f8c in get_next_display_element (it=0x7fffffff75d0) at xdisp.c:7599
> #6  0x00005555555e3133 in display_tab_bar_line (it=0x7fffffff75d0, height=-1) at xdisp.c:13389
> #7  0x00005555555e3901 in tab_bar_height (f=0x5555560a2dc8, n_rows=0x5555560a2f08, pixelwise=true) at xdisp.c:13515
> #8  0x00005555555e3c27 in redisplay_tab_bar (f=0x5555560a2dc8) at xdisp.c:13597

Thanks, should be fixed now on the emacs-28 branch.

Message #20 received at 52947 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 52947 <at> debbugs.gnu.org, dlacewell <at> gmail.com
Subject: Re: bug#52947: 29.0.50; Newline in tab-bar-format causes lockup
Date: Tue, 04 Jan 2022 09:57:04 +0200

close 52947 28.0.90
thanks

>> (gdb) bt
>> #0  make_lisp_symbol (sym=0x555555cfd9c0 <lispsym>) at lisp.h:1002
>> #1  0x00005555555b9766 in builtin_lisp_symbol (index=0) at lisp.h:1008
>> #2  0x00005555555b9cf6 in CHAR_TABLE_REF_ASCII (ct=XIL(0x7ffff0b438dd), idx=10) at lisp.h:2031
>> #3  0x00005555555b9d3e in CHAR_TABLE_REF (ct=XIL(0x7ffff0b438dd), idx=10) at lisp.h:2042
>> #4  0x00005555555d16de in lookup_glyphless_char_display (c=10, it=0x7fffffff75d0) at xdisp.c:7410
>> #5  0x00005555555d1f8c in get_next_display_element (it=0x7fffffff75d0) at xdisp.c:7599
>> #6  0x00005555555e3133 in display_tab_bar_line (it=0x7fffffff75d0, height=-1) at xdisp.c:13389
>> #7  0x00005555555e3901 in tab_bar_height (f=0x5555560a2dc8, n_rows=0x5555560a2f08, pixelwise=true) at xdisp.c:13515
>> #8  0x00005555555e3c27 in redisplay_tab_bar (f=0x5555560a2dc8) at xdisp.c:13597
>
> Thanks, should be fixed now on the emacs-28 branch.

I guess this can be closed now.

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