GNU bug report logs - #73456
31.0.50; X protocol error: RenderBadGlyph

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

From: Visuwesh <visuweshm <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; X protocol error: RenderBadGlyph
Date: Tue, 24 Sep 2024 22:20:54 +0530

I am using Xfce4 4.18.  When trying to focus an emacsclient frame that
was beneath Firefox, all open frames were suddenly killed.  Opening a
new frame had the following in the *Messages* buffer:

    X protocol error: RenderBadGlyph (invalid Glyph parameter) on protocol request 139
    Serial no: 29516839
    Failing resource ID (if any): 0x21
    Minor code: 22
    This is a bug!  Please report this to bug-gnu-emacs <at> gnu.org!

This isn't the first time this has happened.  Something similar happened
a couple of days back, and it killed Emacs with the following backtrace:

    Backtrace:
    emacs(+0x199dfb)[0x55bc40b6edfb]
    emacs(+0x4b22a)[0x55bc40a2022a]
    emacs(+0x4b727)[0x55bc40a20727]
    emacs(+0x4b72e)[0x55bc40a2072e]
    emacs(+0x1983d9)[0x55bc40b6d3d9]
    /lib/x86_64-linux-gnu/libc.so.6(+0x3f590)[0x7fda07ec1590]
    /lib/x86_64-linux-gnu/libX11.so.6(+0x31f48)[0x7fda09829f48]
    /lib/x86_64-linux-gnu/libX11.so.6(XEventsQueued+0x1b)[0x7fda0982dd5b]
    /lib/x86_64-linux-gnu/libXt.so.6(XtAppPending+0x6d)[0x7fda099ab82d]
    emacs(+0xc3205)[0x55bc40a98205]
    emacs(+0xc32ce)[0x55bc40a982ce]
    emacs(+0xc4b14)[0x55bc40a99b14]
    emacs(+0xc21ea)[0x55bc40a971ea]
    emacs(+0x252af9)[0x55bc40c27af9]
    emacs(+0x20a7a6)[0x55bc40bdf7a6]
    emacs(+0x20343e)[0x55bc40bd843e]
    emacs(+0x20a7a6)[0x55bc40bdf7a6]
    emacs(+0x204a62)[0x55bc40bd9a62]
    emacs(+0x252af9)[0x55bc40c27af9]
    emacs(+0x20a7a6)[0x55bc40bdf7a6]
    emacs(+0x18c6b5)[0x55bc40b616b5]
    emacs(+0x206017)[0x55bc40bdb017]
    emacs(+0x177bbe)[0x55bc40b4cbbe]
    emacs(+0x205f71)[0x55bc40bdaf71]
    emacs(+0x177b53)[0x55bc40b4cb53]
    emacs(+0x17f491)[0x55bc40b54491]
    emacs(+0x17f820)[0x55bc40b54820]
    emacs(+0x53caa)[0x55bc40a28caa]
    /lib/x86_64-linux-gnu/libc.so.6(+0x29c8a)[0x7fda07eabc8a]
    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85)[0x7fda07eabd45]
    emacs(+0x541c1)[0x55bc40a291c1]

This is probably not useful in any degree but I am including it in hopes
that it might hint at something.  I tried running the debug build of
Emacs in hopes of catching this backtrace for some time but it was
unfruitful since this is only reproduced rarely.

In GNU Emacs 31.0.50 (build 7, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.18.0, Xaw scroll bars) of 2024-09-09 built on astatine
Repository revision: 7d7aa65f63db78c5732f1580213fc3767b767a4a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Debian GNU/Linux trixie/sid

Configured using:
 'configure --with-sound=alsa --with-x-toolkit=lucid --without-xaw3d
 --without-gconf --without-libsystemd --with-cairo'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM
XINPUT2 XPM LUCID ZLIB
Important settings:
  value of $LC_MONETARY: ta_IN.UTF-8
  value of $LC_NUMERIC: ta_IN.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  csv-field-index-mode: t
  TeX-PDF-mode: t
  recentf-mode: t
  server-mode: t
  paredit-mode: t
  eros-mode: t
  flymake-mode: t
  pdf-occur-global-minor-mode: t
  minibuffer-depth-indicate-mode: t
  repeat-mode: t
  display-time-mode: t
  display-battery-mode: t
  delete-selection-mode: t
  xterm-mouse-mode: t
  vz/winkey-minor-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  use-hard-newlines: t
  tab-bar-history-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  undelete-frame-mode: t
  minibuffer-regexp-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t

Load-path shadows:
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/home/viz/lib/emacs/straight/build/org/ob-awk hides /home/viz/lib/ports/emacs/lisp/org/ob-awk
/home/viz/lib/emacs/straight/build/org/org-capture hides /home/viz/lib/ports/emacs/lisp/org/org-capture
/home/viz/lib/emacs/straight/build/org/ob-sql hides /home/viz/lib/ports/emacs/lisp/org/ob-sql
/home/viz/lib/emacs/straight/build/org/ol-doi hides /home/viz/lib/ports/emacs/lisp/org/ol-doi
/home/viz/lib/emacs/straight/build/org/org-plot hides /home/viz/lib/ports/emacs/lisp/org/org-plot
/home/viz/lib/emacs/straight/build/org/ob-dot hides /home/viz/lib/ports/emacs/lisp/org/ob-dot
/home/viz/lib/emacs/straight/build/org/ol-eshell hides /home/viz/lib/ports/emacs/lisp/org/ol-eshell
/home/viz/lib/emacs/straight/build/org/ob-C hides /home/viz/lib/ports/emacs/lisp/org/ob-C
/home/viz/lib/emacs/straight/build/org/ob-ref hides /home/viz/lib/ports/emacs/lisp/org/ob-ref
/home/viz/lib/emacs/straight/build/org/org-list hides /home/viz/lib/ports/emacs/lisp/org/org-list
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/home/viz/lib/emacs/straight/build/org/ob-haskell hides /home/viz/lib/ports/emacs/lisp/org/ob-haskell
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/home/viz/lib/emacs/straight/build/org/ox-html hides /home/viz/lib/ports/emacs/lisp/org/ox-html
/home/viz/lib/emacs/straight/build/org/oc-biblatex hides /home/viz/lib/ports/emacs/lisp/org/oc-biblatex
/home/viz/lib/emacs/straight/build/org/ob-table hides /home/viz/lib/ports/emacs/lisp/org/ob-table
/home/viz/lib/emacs/straight/build/org/ob hides /home/viz/lib/ports/emacs/lisp/org/ob
/home/viz/lib/emacs/straight/build/org/ol-w3m hides /home/viz/lib/ports/emacs/lisp/org/ol-w3m
/home/viz/lib/emacs/straight/build/org/ob-groovy hides /home/viz/lib/ports/emacs/lisp/org/ob-groovy
/home/viz/lib/emacs/straight/build/org/org-footnote hides /home/viz/lib/ports/emacs/lisp/org/org-footnote
/home/viz/lib/emacs/straight/build/org/org-entities hides /home/viz/lib/ports/emacs/lisp/org/org-entities
/home/viz/lib/emacs/straight/build/org/ob-org hides /home/viz/lib/ports/emacs/lisp/org/ob-org
/home/viz/lib/emacs/straight/build/org/org-macs hides /home/viz/lib/ports/emacs/lisp/org/org-macs
/home/viz/lib/emacs/straight/build/org/ob-shell hides /home/viz/lib/ports/emacs/lisp/org/ob-shell
/home/viz/lib/emacs/straight/build/org/ob-R hides /home/viz/lib/ports/emacs/lisp/org/ob-R
/home/viz/lib/emacs/straight/build/org/ob-lisp hides /home/viz/lib/ports/emacs/lisp/org/ob-lisp
/home/viz/lib/emacs/straight/build/org/ob-js hides /home/viz/lib/ports/emacs/lisp/org/ob-js
/home/viz/lib/emacs/straight/build/org/ob-maxima hides /home/viz/lib/ports/emacs/lisp/org/ob-maxima
/home/viz/lib/emacs/straight/build/org/org-element-ast hides /home/viz/lib/ports/emacs/lisp/org/org-element-ast
/home/viz/lib/emacs/straight/build/org/ox-ascii hides /home/viz/lib/ports/emacs/lisp/org/ox-ascii
/home/viz/lib/emacs/straight/build/org/org-persist hides /home/viz/lib/ports/emacs/lisp/org/org-persist
/home/viz/lib/emacs/straight/build/org/ox-md hides /home/viz/lib/ports/emacs/lisp/org/ox-md
/home/viz/lib/emacs/straight/build/org/org-duration hides /home/viz/lib/ports/emacs/lisp/org/org-duration
/home/viz/lib/emacs/straight/build/org/ob-lilypond hides /home/viz/lib/ports/emacs/lisp/org/ob-lilypond
/home/viz/lib/emacs/straight/build/org/ob-ruby hides /home/viz/lib/ports/emacs/lisp/org/ob-ruby
/home/viz/lib/emacs/straight/build/org/ob-core hides /home/viz/lib/ports/emacs/lisp/org/ob-core
/home/viz/lib/emacs/straight/build/org/ol-mhe hides /home/viz/lib/ports/emacs/lisp/org/ol-mhe
/home/viz/lib/emacs/straight/build/org/ob-ditaa hides /home/viz/lib/ports/emacs/lisp/org/ob-ditaa
/home/viz/lib/emacs/straight/build/org/ol-irc hides /home/viz/lib/ports/emacs/lisp/org/ol-irc
/home/viz/lib/emacs/straight/build/org/ob-fortran hides /home/viz/lib/ports/emacs/lisp/org/ob-fortran
/home/viz/lib/emacs/straight/build/org/org-feed hides /home/viz/lib/ports/emacs/lisp/org/org-feed
/home/viz/lib/emacs/straight/build/org/ob-java hides /home/viz/lib/ports/emacs/lisp/org/ob-java
/home/viz/lib/emacs/straight/build/org/ox hides /home/viz/lib/ports/emacs/lisp/org/ox
/home/viz/lib/emacs/straight/build/org/oc-csl hides /home/viz/lib/ports/emacs/lisp/org/oc-csl
/home/viz/lib/emacs/straight/build/org/ob-exp hides /home/viz/lib/ports/emacs/lisp/org/ob-exp
/home/viz/lib/emacs/straight/build/org/org-loaddefs hides /home/viz/lib/ports/emacs/lisp/org/org-loaddefs
/home/viz/lib/emacs/straight/build/org/ob-scheme hides /home/viz/lib/ports/emacs/lisp/org/ob-scheme
/home/viz/lib/emacs/straight/build/org/ob-tangle hides /home/viz/lib/ports/emacs/lisp/org/ob-tangle
/home/viz/lib/emacs/straight/build/org/ox-koma-letter hides /home/viz/lib/ports/emacs/lisp/org/ox-koma-letter
/home/viz/lib/emacs/straight/build/org/ob-gnuplot hides /home/viz/lib/ports/emacs/lisp/org/ob-gnuplot
/home/viz/lib/emacs/straight/build/org/org-crypt hides /home/viz/lib/ports/emacs/lisp/org/org-crypt
/home/viz/lib/emacs/straight/build/org/org-datetree hides /home/viz/lib/ports/emacs/lisp/org/org-datetree
/home/viz/lib/emacs/straight/build/org/org-attach hides /home/viz/lib/ports/emacs/lisp/org/org-attach
/home/viz/lib/emacs/straight/build/org/ob-julia hides /home/viz/lib/ports/emacs/lisp/org/ob-julia
/home/viz/lib/emacs/straight/build/org/ob-sqlite hides /home/viz/lib/ports/emacs/lisp/org/ob-sqlite
/home/viz/lib/emacs/straight/build/org/org-cycle hides /home/viz/lib/ports/emacs/lisp/org/org-cycle
/home/viz/lib/emacs/straight/build/org/org-faces hides /home/viz/lib/ports/emacs/lisp/org/org-faces
/home/viz/lib/emacs/straight/build/org/org-mobile hides /home/viz/lib/ports/emacs/lisp/org/org-mobile
/home/viz/lib/emacs/straight/build/org/org-ctags hides /home/viz/lib/ports/emacs/lisp/org/org-ctags
/home/viz/lib/emacs/straight/build/org/ob-latex hides /home/viz/lib/ports/emacs/lisp/org/ob-latex
/home/viz/lib/emacs/straight/build/org/ob-matlab hides /home/viz/lib/ports/emacs/lisp/org/ob-matlab
/home/viz/lib/emacs/straight/build/org/ob-sed hides /home/viz/lib/ports/emacs/lisp/org/ob-sed
/home/viz/lib/emacs/straight/build/org/org-attach-git hides /home/viz/lib/ports/emacs/lisp/org/org-attach-git
/home/viz/lib/emacs/straight/build/org/ob-python hides /home/viz/lib/ports/emacs/lisp/org/ob-python
/home/viz/lib/emacs/straight/build/org/ox-icalendar hides /home/viz/lib/ports/emacs/lisp/org/ox-icalendar
/home/viz/lib/emacs/straight/build/org/org-tempo hides /home/viz/lib/ports/emacs/lisp/org/org-tempo
/home/viz/lib/emacs/straight/build/org/ob-screen hides /home/viz/lib/ports/emacs/lisp/org/ob-screen
/home/viz/lib/emacs/straight/build/org/org-num hides /home/viz/lib/ports/emacs/lisp/org/org-num
/home/viz/lib/emacs/straight/build/org/ob-forth hides /home/viz/lib/ports/emacs/lisp/org/ob-forth
/home/viz/lib/emacs/straight/build/org/ox-odt hides /home/viz/lib/ports/emacs/lisp/org/ox-odt
/home/viz/lib/emacs/straight/build/org/ol-bbdb hides /home/viz/lib/ports/emacs/lisp/org/ol-bbdb
/home/viz/lib/emacs/straight/build/org/org-table hides /home/viz/lib/ports/emacs/lisp/org/org-table
/home/viz/lib/emacs/straight/build/org/ox-man hides /home/viz/lib/ports/emacs/lisp/org/ox-man
/home/viz/lib/emacs/straight/build/org/ox-org hides /home/viz/lib/ports/emacs/lisp/org/ox-org
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/home/viz/lib/emacs/straight/build/org/ob-clojure hides /home/viz/lib/ports/emacs/lisp/org/ob-clojure
/home/viz/lib/emacs/straight/build/org/org-id hides /home/viz/lib/ports/emacs/lisp/org/org-id
/home/viz/lib/emacs/straight/build/org/oc-natbib hides /home/viz/lib/ports/emacs/lisp/org/oc-natbib
/home/viz/lib/emacs/straight/build/org/ox-texinfo hides /home/viz/lib/ports/emacs/lisp/org/ox-texinfo
/home/viz/lib/emacs/straight/build/org/org-agenda hides /home/viz/lib/ports/emacs/lisp/org/org-agenda
/home/viz/lib/emacs/straight/build/org/org-src hides /home/viz/lib/ports/emacs/lisp/org/org-src
/home/viz/lib/emacs/straight/build/org/ob-emacs-lisp hides /home/viz/lib/ports/emacs/lisp/org/ob-emacs-lisp
/home/viz/lib/emacs/straight/build/org/ob-css hides /home/viz/lib/ports/emacs/lisp/org/ob-css
/home/viz/lib/emacs/straight/build/org/ox-latex hides /home/viz/lib/ports/emacs/lisp/org/ox-latex
/home/viz/lib/emacs/straight/build/org/oc hides /home/viz/lib/ports/emacs/lisp/org/oc
/home/viz/lib/emacs/straight/build/org/ol hides /home/viz/lib/ports/emacs/lisp/org/ol
/home/viz/lib/emacs/straight/build/org/org-element hides /home/viz/lib/ports/emacs/lisp/org/org-element
/home/viz/lib/emacs/straight/build/org/org hides /home/viz/lib/ports/emacs/lisp/org/org
/home/viz/lib/emacs/straight/build/org/org-goto hides /home/viz/lib/ports/emacs/lisp/org/org-goto
/home/viz/lib/emacs/straight/build/org/ob-eval hides /home/viz/lib/ports/emacs/lisp/org/ob-eval
/home/viz/lib/emacs/straight/build/org/org-habit hides /home/viz/lib/ports/emacs/lisp/org/org-habit
/home/viz/lib/emacs/straight/build/org/org-pcomplete hides /home/viz/lib/ports/emacs/lisp/org/org-pcomplete
/home/viz/lib/emacs/straight/build/org/ol-eww hides /home/viz/lib/ports/emacs/lisp/org/ol-eww
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Features:
(shadow emacsbug wdired tramp-archive tramp-gvfs nov esxml-query
ind-util gnus-search eieio-opt speedbar ezimage dframe nnfolder
calc-poly calc-units calc-undo calc-arith calc-misc calc-alg calc-vec
csv-mode man calccomp calc-aent calc-yank calc-menu msb icomplete
cal-islam holidays holiday-loaddefs cal-move olivetti pdf-sync
pdf-outline pdf-links pdf-history pdf-roll flyspell ecomplete locate
tabify org-capture doct ispell tar-mode arc-mode archive-mode view
ement-room-list taxy-magit-section taxy svg-lib persist
ement-tabulated-room-list ement ement-notifications ement-notify
notifications ement-room ement-lib ement-api ement-structs ement-macros
magit-section dns dictionary external-completion dictionary-connection
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emacs)

Memory information:
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Message #8 received at 73456 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Visuwesh <visuweshm <at> gmail.com>, Po Lu <luangruo <at> yahoo.com>
Cc: 73456 <at> debbugs.gnu.org
Subject: Re: bug#73456: 31.0.50; X protocol error: RenderBadGlyph
Date: Tue, 24 Sep 2024 21:07:03 +0300

> From: Visuwesh <visuweshm <at> gmail.com>
> Date: Tue, 24 Sep 2024 22:20:54 +0530
> 
> I am using Xfce4 4.18.  When trying to focus an emacsclient frame that
> was beneath Firefox, all open frames were suddenly killed.  Opening a
> new frame had the following in the *Messages* buffer:
> 
>     X protocol error: RenderBadGlyph (invalid Glyph parameter) on protocol request 139
>     Serial no: 29516839
>     Failing resource ID (if any): 0x21
>     Minor code: 22
>     This is a bug!  Please report this to bug-gnu-emacs <at> gnu.org!
> 
> This isn't the first time this has happened.  Something similar happened
> a couple of days back, and it killed Emacs with the following backtrace:
> 
>     Backtrace:
>     emacs(+0x199dfb)[0x55bc40b6edfb]
>     emacs(+0x4b22a)[0x55bc40a2022a]
>     emacs(+0x4b727)[0x55bc40a20727]
>     emacs(+0x4b72e)[0x55bc40a2072e]
>     emacs(+0x1983d9)[0x55bc40b6d3d9]
>     /lib/x86_64-linux-gnu/libc.so.6(+0x3f590)[0x7fda07ec1590]
>     /lib/x86_64-linux-gnu/libX11.so.6(+0x31f48)[0x7fda09829f48]
>     /lib/x86_64-linux-gnu/libX11.so.6(XEventsQueued+0x1b)[0x7fda0982dd5b]
>     /lib/x86_64-linux-gnu/libXt.so.6(XtAppPending+0x6d)[0x7fda099ab82d]
>     emacs(+0xc3205)[0x55bc40a98205]
>     emacs(+0xc32ce)[0x55bc40a982ce]
>     emacs(+0xc4b14)[0x55bc40a99b14]
>     emacs(+0xc21ea)[0x55bc40a971ea]
>     emacs(+0x252af9)[0x55bc40c27af9]
>     emacs(+0x20a7a6)[0x55bc40bdf7a6]
>     emacs(+0x20343e)[0x55bc40bd843e]
>     emacs(+0x20a7a6)[0x55bc40bdf7a6]
>     emacs(+0x204a62)[0x55bc40bd9a62]
>     emacs(+0x252af9)[0x55bc40c27af9]
>     emacs(+0x20a7a6)[0x55bc40bdf7a6]
>     emacs(+0x18c6b5)[0x55bc40b616b5]
>     emacs(+0x206017)[0x55bc40bdb017]
>     emacs(+0x177bbe)[0x55bc40b4cbbe]
>     emacs(+0x205f71)[0x55bc40bdaf71]
>     emacs(+0x177b53)[0x55bc40b4cb53]
>     emacs(+0x17f491)[0x55bc40b54491]
>     emacs(+0x17f820)[0x55bc40b54820]
>     emacs(+0x53caa)[0x55bc40a28caa]
>     /lib/x86_64-linux-gnu/libc.so.6(+0x29c8a)[0x7fda07eabc8a]
>     /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85)[0x7fda07eabd45]
>     emacs(+0x541c1)[0x55bc40a291c1]
> 
> This is probably not useful in any degree but I am including it in hopes
> that it might hint at something.  I tried running the debug build of
> Emacs in hopes of catching this backtrace for some time but it was
> unfruitful since this is only reproduced rarely.

Thanks, but the only way to debug these problems is to run Emacs under
GDB at all times, and run it in X-synchronous mode (as described in
etc/DEBUG).  Only then, when the rare problem happens, you will be
able to collect a meaningful backtrace which will point out the
offending code.

Unless Po Lu has a lucky guess, of course...

Message #11 received at 73456 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 73456 <at> debbugs.gnu.org, Visuwesh <visuweshm <at> gmail.com>
Subject: Re: bug#73456: 31.0.50; X protocol error: RenderBadGlyph
Date: Wed, 25 Sep 2024 08:34:47 +0800

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

> Unless Po Lu has a lucky guess, of course...

Not this time, alas.

Message #14 received at 73456 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Po Lu <luangruo <at> yahoo.com>, 73456 <at> debbugs.gnu.org
Subject: Re: bug#73456: 31.0.50; X protocol error: RenderBadGlyph
Date: Wed, 25 Sep 2024 11:33:09 +0530

[செவ்வாய் செப்டம்பர் 24, 2024] Eli Zaretskii wrote:

> Thanks, but the only way to debug these problems is to run Emacs under
> GDB at all times, and run it in X-synchronous mode (as described in
> etc/DEBUG).  Only then, when the rare problem happens, you will be
> able to collect a meaningful backtrace which will point out the
> offending code.

I figured this would be the case.  I saw that message yesterday, and
today Emacs crashed with the same backtrace.  I hope I can find a
reliable reproducer for the problem since the problem seems to happen
once a few months so running Emacs under GDB all the time is not
feasible for me.

Message #17 received at 73456 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: luangruo <at> yahoo.com, 73456 <at> debbugs.gnu.org
Subject: Re: bug#73456: 31.0.50; X protocol error: RenderBadGlyph
Date: Wed, 25 Sep 2024 15:09:15 +0300

> From: Visuwesh <visuweshm <at> gmail.com>
> Cc: Po Lu <luangruo <at> yahoo.com>,  73456 <at> debbugs.gnu.org
> Date: Wed, 25 Sep 2024 11:33:09 +0530
> 
> [செவ்வாய் செப்டம்பர் 24, 2024] Eli Zaretskii wrote:
> 
> > Thanks, but the only way to debug these problems is to run Emacs under
> > GDB at all times, and run it in X-synchronous mode (as described in
> > etc/DEBUG).  Only then, when the rare problem happens, you will be
> > able to collect a meaningful backtrace which will point out the
> > offending code.
> 
> I figured this would be the case.  I saw that message yesterday, and
> today Emacs crashed with the same backtrace.  I hope I can find a
> reliable reproducer for the problem since the problem seems to happen
> once a few months so running Emacs under GDB all the time is not
> feasible for me.

Why is it not feasible for you to run Emacs under GDB at all times?
(Apologies if you already explained that once and I forgot.)  GDB
generally gets out of the way as long as Emacs is running smoothly,
and only kicks in when there's some sort of trouble.

If you are using the master branch for production work, I suggest to
run Emacs under GDB all the time, because the master branch is not
stable enough, and detailed information about crashes and aborts is
very important to us.

TIA

Message #20 received at 73456 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: luangruo <at> yahoo.com, 73456 <at> debbugs.gnu.org
Subject: Re: bug#73456: 31.0.50; X protocol error: RenderBadGlyph
Date: Wed, 25 Sep 2024 18:34:37 +0530

[புதன் செப்டம்பர் 25, 2024] Eli Zaretskii wrote:

>> From: Visuwesh <visuweshm <at> gmail.com>
>> Cc: Po Lu <luangruo <at> yahoo.com>,  73456 <at> debbugs.gnu.org
>> Date: Wed, 25 Sep 2024 11:33:09 +0530
>> 
>> [செவ்வாய் செப்டம்பர் 24, 2024] Eli Zaretskii wrote:
>> 
>> > Thanks, but the only way to debug these problems is to run Emacs under
>> > GDB at all times, and run it in X-synchronous mode (as described in
>> > etc/DEBUG).  Only then, when the rare problem happens, you will be
>> > able to collect a meaningful backtrace which will point out the
>> > offending code.
>> 
>> I figured this would be the case.  I saw that message yesterday, and
>> today Emacs crashed with the same backtrace.  I hope I can find a
>> reliable reproducer for the problem since the problem seems to happen
>> once a few months so running Emacs under GDB all the time is not
>> feasible for me.
>
> Why is it not feasible for you to run Emacs under GDB at all times?
> (Apologies if you already explained that once and I forgot.)  GDB
> generally gets out of the way as long as Emacs is running smoothly,
> and only kicks in when there's some sort of trouble.

I didn't explain it before so no worries there.  I ran a debug build of
Emacs for a ~month before and it was too slow for me to comfortably use
it (In particular, Gnus was painfully slow, and Org is a bit too slow).
I should fallback to using the stable branch at this point honestly.

> If you are using the master branch for production work, I suggest to
> run Emacs under GDB all the time, because the master branch is not
> stable enough, and detailed information about crashes and aborts is
> very important to us.
>
> TIA

When my schedule gets a bit less tense, I will fallback to running the
debug build of Emacs all the time but for the foreseeable future, I
cannot see it happening.

Message #23 received at 73456 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: luangruo <at> yahoo.com, 73456 <at> debbugs.gnu.org
Subject: Re: bug#73456: 31.0.50; X protocol error: RenderBadGlyph
Date: Wed, 25 Sep 2024 18:54:55 +0300

> From: Visuwesh <visuweshm <at> gmail.com>
> Cc: luangruo <at> yahoo.com,  73456 <at> debbugs.gnu.org
> Date: Wed, 25 Sep 2024 18:34:37 +0530
> 
> [புதன் செப்டம்பர் 25, 2024] Eli Zaretskii wrote:
> 
> > Why is it not feasible for you to run Emacs under GDB at all times?
> > (Apologies if you already explained that once and I forgot.)  GDB
> > generally gets out of the way as long as Emacs is running smoothly,
> > and only kicks in when there's some sort of trouble.
> 
> I didn't explain it before so no worries there.  I ran a debug build of
> Emacs for a ~month before and it was too slow for me to comfortably use
> it (In particular, Gnus was painfully slow, and Org is a bit too slow).

So the problem is not GDB, but the debug build of Emacs?  If so, you
can run the optimized build under GDB as well, just be sure to use the
"-g3" switch to GCC when you build, and don't strip the binary (i.e.,
if you install the build, do NOT use "make install-strip").  The
backtrace will be somewhat less informative, but it is usually still
useful.

However, please remember to invoke Emacs in X-synchronous mode by
using '-xrm "emacs.synchronous: true"' on the command line, when the
issue is related to X protocol errors, because otherwise X errors are
reported asynchronously, and it is impossible to know which code
caused an X error.

Message #26 received at 73456 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: luangruo <at> yahoo.com, 73456 <at> debbugs.gnu.org
Subject: Re: bug#73456: 31.0.50; X protocol error: RenderBadGlyph
Date: Wed, 25 Sep 2024 23:39:31 +0530

[புதன் செப்டம்பர் 25, 2024] Eli Zaretskii wrote:

>> From: Visuwesh <visuweshm <at> gmail.com>
>> Cc: luangruo <at> yahoo.com,  73456 <at> debbugs.gnu.org
>> Date: Wed, 25 Sep 2024 18:34:37 +0530
>> 
>> [புதன் செப்டம்பர் 25, 2024] Eli Zaretskii wrote:
>> 
>> > Why is it not feasible for you to run Emacs under GDB at all times?
>> > (Apologies if you already explained that once and I forgot.)  GDB
>> > generally gets out of the way as long as Emacs is running smoothly,
>> > and only kicks in when there's some sort of trouble.
>> 
>> I didn't explain it before so no worries there.  I ran a debug build of
>> Emacs for a ~month before and it was too slow for me to comfortably use
>> it (In particular, Gnus was painfully slow, and Org is a bit too slow).
>
> So the problem is not GDB, but the debug build of Emacs?  If so, you
> can run the optimized build under GDB as well, just be sure to use the
> "-g3" switch to GCC when you build, and don't strip the binary (i.e.,
> if you install the build, do NOT use "make install-strip").  The
> backtrace will be somewhat less informative, but it is usually still
> useful.

Thanks, it is reassuring to know that it will be useful still.  I will
rebuild Emacs and run it under GDB in the coming days.

> However, please remember to invoke Emacs in X-synchronous mode by
> using '-xrm "emacs.synchronous: true"' on the command line, when the
> issue is related to X protocol errors, because otherwise X errors are
> reported asynchronously, and it is impossible to know which code
> caused an X error.

Noted.

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