* bug#65897: 29.1.50; Debugging errors surfaced through emacsclient is hard
@ 2023-09-12 19:42 Spencer Baugh
2023-09-14 14:54 ` Eli Zaretskii
0 siblings, 1 reply; 3+ messages in thread
From: Spencer Baugh @ 2023-09-12 19:42 UTC (permalink / raw)
To: 65897
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
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magit-auto-revert-mode: t
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shell-dirtrack-mode: t
server-mode: t
windmove-mode: t
savehist-mode: t
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tooltip-mode: t
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eldoc-mode: t
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electric-indent-mode: t
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Features:
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^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#65897: 29.1.50; Debugging errors surfaced through emacsclient is hard
2023-09-12 19:42 bug#65897: 29.1.50; Debugging errors surfaced through emacsclient is hard Spencer Baugh
@ 2023-09-14 14:54 ` Eli Zaretskii
2023-09-18 14:00 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 1 reply; 3+ messages in thread
From: Eli Zaretskii @ 2023-09-14 14:54 UTC (permalink / raw)
To: Spencer Baugh, Stefan Monnier; +Cc: 65897
> From: Spencer Baugh <sbaugh@janestreet.com>
> 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?
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#65897: 29.1.50; Debugging errors surfaced through emacsclient is hard
2023-09-14 14:54 ` Eli Zaretskii
@ 2023-09-18 14:00 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 0 replies; 3+ messages in thread
From: Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2023-09-18 14:00 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: Spencer Baugh, 65897
>> 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.
AFAIK it is perfectly safe to drop into the debugger when running timers
and process-filters. I believe the reason why this doesn't happen here is
because of the `condition-case` used to grab the error and send it to
Emacsclient's output. See patch below.
We could also offer a way to grab the backtrace and send it over to
Emacsclient's output.
Stefan
diff --git a/lisp/server.el b/lisp/server.el
index 10f15598221..2536a9c6591 100644
--- a/lisp/server.el
+++ b/lisp/server.el
@@ -1175,7 +1175,7 @@ server-process-filter
(when prev
(setq string (concat prev string))
(process-put proc 'previous-string nil)))
- (condition-case err
+ (condition-case-unless-debug err
(progn
(server-add-client proc)
;; Send our pid
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2023-09-12 19:42 bug#65897: 29.1.50; Debugging errors surfaced through emacsclient is hard Spencer Baugh
2023-09-14 14:54 ` Eli Zaretskii
2023-09-18 14:00 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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