GNU logs - #65897, boring messages

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Subject: bug#65897: 29.1.50; Debugging errors surfaced through emacsclient is hard
Resent-From: Spencer Baugh <sbaugh@HIDDEN>
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Errors which happen through emacsclient never trigger the debugger and
only print a simple error message, which makes it very difficult to
debug them.  If there's an error which, for some reason, only happens
when running emacsclient, then life becomes very difficult.  I just
encountered this with one of my users - I still have no idea why the
error only affected emacsclient, or how I could have reproduced it
without emacsclient, I eventually fixed it by bisecting their .emacs.

Toy example:
1. emacs -Q
2. (server-start)
3. (add-hook 'before-make-frame-hook (lambda () (error "frame hook error")))
4. emacsclient -c

The output of emacsclient is:

Waiting for Emacs...
*ERROR*: frame hook error

That's all, there is no way to get more information about the error that
happened.

Ideally, when emacsclient encounters an error and debug-on-error is
non-nil, it should cause Emacs to enter the debugger.


In GNU Emacs 29.1.50 (build 4, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.15.12, Xaw scroll bars) of 2023-09-11 built on

Repository revision: f9bc92d0b36bc631d11c194e4b580f43b7b8dcba
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Rocky Linux 8.8 (Green Obsidian)

Configured using:
 'configure --config-cache --with-x-toolkit=lucid
 --with-gif=ifavailable'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM
XINPUT2 XPM LUCID ZLIB

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

Major mode: ELisp/l

Minor modes in effect:
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  editorconfig-mode: t
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  global-git-commit-mode: t
  magit-auto-revert-mode: t
  auto-revert-mode: t
  shell-dirtrack-mode: t
  server-mode: t
  windmove-mode: t
  savehist-mode: t
  save-place-mode: t
  tooltip-mode: t
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  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
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term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
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european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
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threads dbusbind inotify dynamic-setting system-font-setting
font-render-setting cairo x-toolkit xinput2 x multi-tty
make-network-process emacs)

Memory information:
((conses 16 1290183 152090)
 (symbols 48 57370 1)
 (strings 32 222722 19140)
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 (vectors 16 116575)
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 (floats 8 770 630)
 (intervals 56 99161 3193)
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Spencer Baugh <sbaugh@HIDDEN>
Subject: bug#65897: Acknowledgement (29.1.50; Debugging errors surfaced
 through emacsclient is hard)
Message-ID: <handler.65897.B.169454778026590.ack <at> debbugs.gnu.org>
References: <iery1hb9o0i.fsf@HIDDEN>
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Reply-To: 65897 <at> debbugs.gnu.org
Date: Tue, 12 Sep 2023 19:43:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#65897: 29.1.50; Debugging errors surfaced through emacsclient is hard
Resent-From: Eli Zaretskii <eliz@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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Resent-Date: Thu, 14 Sep 2023 14:55:02 +0000
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To: Spencer Baugh <sbaugh@HIDDEN>, Stefan Monnier <monnier@HIDDEN>
Cc: 65897 <at> debbugs.gnu.org
Date: Thu, 14 Sep 2023 17:54:28 +0300
Message-Id: <83msxols9n.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <iery1hb9o0i.fsf@HIDDEN> (message from Spencer Baugh on
 Tue, 12 Sep 2023 15:42:37 -0400)
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> From: Spencer Baugh <sbaugh@HIDDEN>
> Date: Tue, 12 Sep 2023 15:42:37 -0400
> 
> Toy example:
> 1. emacs -Q
> 2. (server-start)
> 3. (add-hook 'before-make-frame-hook (lambda () (error "frame hook error")))
> 4. emacsclient -c
> 
> The output of emacsclient is:
> 
> Waiting for Emacs...
> *ERROR*: frame hook error
> 
> That's all, there is no way to get more information about the error that
> happened.
> 
> Ideally, when emacsclient encounters an error and debug-on-error is
> non-nil, it should cause Emacs to enter the debugger.

I'm not sure we can allow entering the debugger from server-execute.
That function is documented as being called from timers and process
filters, so entering the debugger might be unsafe.

Stefan, any comments?

Last modified: Thu, 14 Sep 2023 15:00:02 UTC

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