Questions tagged [debugging]

Debugging is a methodical process of finding and reducing the number of bugs, or defects, in a computer program.

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22
votes
1answer
2k views

How do I troubleshoot Emacs problems?

In a situation where Emacs is not behaving like I want, what can I do to troubleshoot the problem? What steps can I take to find and fix the problem myself? Or, failing that, how can I gather useful ...
17
votes
1answer
2k views

How do I debug an emacs crash?

I am debugging why emacs crashes when using a function from a package1. The aim of this debug process is to get useful data to submit using M-x report-emacs-bug. To get help on how to debug emacs ...
51
votes
2answers
6k views

Debugging a frozen Emacs

I am using mew for my e-mail. I need to use TLS with my email provider for SMTP. However, when I try to invoke that, Emacs freezes. I would like to take this opportunity to learn more about Emacs ...
52
votes
9answers
26k views

Using Emacs as a full-featured C/C++ IDE

I have been trying off and on for over a year now to use Emacs as a C/C++ IDE. I have only been marginally successful thus far, but have run into a few brick walls along the way. Currently I am ...
7
votes
3answers
583 views

how to get Emacs to locate the error in my init file without relaunching?

When there's an error in one of my init files, I get a vague message like this when I launch Emacs: Warning (initialization): An error occurred while loading /Users/im/.emacs.d/init.elc: (wrong-type-...
52
votes
2answers
10k views

What do I do when Emacs is frozen? [duplicate]

What should I do when Emacs stops responding? My current "emacs-is-frozen" protocol looks like this: Spam C-g (it sometimes works) Wait for a while. pkill -9 emacs What alternate steps could I try ...
11
votes
0answers
534 views

Edebug orgmode source code blocks with input variables

What is the standard method to debug emacs-lisp orgmode source code blocks with input variables as header arguments? I found the hacky solution to insert the following snipped in front of a source ...
7
votes
3answers
5k views

How to debug startup problem, if `--debug-init' has no effect

When I launch Emacs24 (in an Ubuntu machine) I get an error message in the init procedure. Warning (initialization): An error occurred while loading `/home/nivaca/.emacs': But when I launch it with ...
17
votes
3answers
4k views

Show line number on error

Say that emacs throws some error that I don't understand. Or maybe the error says "Symbol's value as variable is void: modes", but there are many occurrences of the symbol modes in my code, so I need ...
14
votes
2answers
2k views

How to cancel `edebug-defun`?

How do I undo the effects of edebug-defun? In other words, how do I rescind the directive that causes edebug to enter debugging mode when a particular function is invoked? Also, I'd really like to ...
9
votes
2answers
1k views

Navigate to the source code of built-in functions and variables

Throughout the day I am constantly using C-h f or C-h v (describe-function and describe-variable) to look up documentation for functions and variables. More often than not, if I don't get all the ...
13
votes
2answers
2k views

How to kill a buffer when it causes Emacs to stop responding? [duplicate]

I use Emacs Dired to manage files. Accidentally, I hit Enter on an image file, Emacs tries to open the image and stop response. Is there a way to kill this process? (Since I am running other ...
3
votes
2answers
641 views

Tracking down a write to a variable

Something setqs desktop-dirname to nil after my "init.el" is loaded. I want to track down the offending code. Just before the end of "init.el", desktop-dirname is correctly set. I checked run-hooks ...
9
votes
1answer
1k views

How to compile emacs with debug symbols?

I'm having trouble walking through emacs source code in gdb. I think I'm missing debug symbols. Following a suggestion from https://stackoverflow.com/a/4298982/2752242, I tried: ./configure CFLAGS="...
2
votes
1answer
66 views

eval-after-load and define-key of raise-sexp results in an error of “Unbalanced parenthesis”

(eval-after-load 'lisp-mode (define-key emacs-lisp-mode-map (kbd "C-c r") 'raise-sexp)) When above lisp is evaluated, it shows following error message. up-list: Scan error: "Unbalanced parentheses"...
17
votes
1answer
764 views

Interrupt evaluation and observe current stack in the emacs-lisp debugger?

If some emacs-lisp function, such as a major mode hook, is taking longer than expected to execute, I would sometimes like to interrupt it and look at the current stack. Ideally, I'd also like to be ...
3
votes
2answers
229 views

How to know which function triggered an autoload of a library

How can I monitor when Emacs loads a library because of an autoloaded function, and also know the name of that function? EXAMPLE:  I type M-x eval-buffer in a buffer where one of the functions uses ...
11
votes
1answer
730 views

Find elisp origin of warning

I ran a command and received a warning in the minibuffer. The exact warning was comint-completion-at-point failed to return valid completion data, after I autocompleted a command in shell-mode. How ...
8
votes
2answers
136 views

Can emacs show formatted backtraces?

When getting an Elisp error and trying to debug the problem, the backtrace buffer is quite hard to read with its long lines. Is there a way to get a pretty-printed backtrace buffer?
7
votes
1answer
2k views

How to fix this startup package initialization problem?

All of a sudden Emacs returns an error at the startup, when I run $ emacs --debug-init from the terminal (linux) I get this debug error message: Debugger entered--Lisp error: (wrong-type-argument ...
6
votes
4answers
1k views

Debugging slowness in init file (not hostname related)

I am seeing some slowness in my init file loading: $ time emacs --debug-init -eval '(kill-emacs)' -Q real 0m0.672s user 0m0.338s sys 0m0.057s $ time emacs --debug-init --eval '(kill-emacs)...
2
votes
1answer
234 views

How do I make a bug report or feature request against GNU Emacs? [duplicate]

I found this list at the emacswiki: FFI (foreign function interface). Would be great to have this in GNU. Enhanced Numerics. We sorely need this too. Apparently much better multimedia support (Of ...
2
votes
1answer
1k views

Error void-variable on function name

What is the difference between the two functions func1 and func2? (defun func1 (arg) (if (listp arg) (mapcar (lambda (x) (func1 x)) arg) arg)) (func1 (list 1 2 3)) (defun func2 (arg) (...
5
votes
2answers
509 views

How to visit file containing source code for a given function?

To open a buffer on the source code for a command definition, I usually follow a convoluted procedure something like this: Guess the name of the mode from the function name Guess the name of an elisp ...
4
votes
2answers
847 views

How to see *Messages* buffer in Spacemacs?

How to see *Messages* buffer as advised in this answer - https://emacs.stackexchange.com/a/32069/23367? Why do I need this? I am new to Spacemacs and I am trying to understand how it can help me ...
4
votes
1answer
981 views

Recentf doesn't remember all files

I have the following problem with recentf. If I open a file from commandline like emacs myfile the file myfile doesn't appear in the list of recently opened files (I also checked directly the file ....
4
votes
1answer
103 views

(RegEx-)Replace: Sporadic Match data clobbered by buffer modification hooks

I know this was asked in other contexts already, but I couldn't find anything related to C++ development with my hooks that could help me. I am working a lot with replace and query-replace and query-...
3
votes
1answer
229 views

trace-redisplay: How to see stderr from within Emacs?

When building Emacs, I use ./configure --enable-checking='glyphs' so that I can take advantage of some of the built-in tools such as M-x trace-redisplay. The redisplay debugging messages can be seen ...
3
votes
0answers
484 views

Emacs sometimes fails to save files

I'm experiencing a weird problem with Emacs on Windows where sometimes, after a while, the current buffer I'm in throws an error when attempting to save the file. I can't seem to reliably reproduce ...
2
votes
1answer
40 views

How to resolve TRAMP spamming empty messages

Connecting to a remote machine with tramp that may have VC (subversion) related files, I tend to see a large number of repeated messages in the *Messages* buffer. For example: Type "q" in help ...
1
vote
1answer
72 views

Unclear error message from a function call in my init file

With my Emacs 26.1 on my 10.13.6 Mac, I want Emacs to systemically open my file located at /Users/ewandelanoy/Documents/html_files/Printable/latinized_agreda2.txt with the mac-roman-mac encoding, ...
1
vote
1answer
2k views

C-x C-f results in the error message: “Wrong type argument: commandp, counsel-find-file”

I opened Emacs, and executed C-x C-f. A beep sounded and the following message appeared in the status line: Wrong type argument: commandp, counsel-find-file All I wanted was to open an existing file....
1
vote
1answer
287 views

emacs Aborted (core dumped)- centOS 7.0 emacs 25.3 — Please Help

Dear stackexchange users, I would really appreciate your help in fixing my issue. I am new with centOS 7.0 with less a year of experience. I was using emacs-24.3 until the following error came up, so ...
0
votes
1answer
85 views

How do I debug when match-data is not getting set?

Lately, I have seen some cases where I use re-search-forward to find a pattern, and then try to do something with the match, only to find that the match-data is apparently not correct. For example, ...
0
votes
0answers
9 views

Line of error in Emacs Regression Test (ERT) framework

I am refactoring some code and adding doc-tests as suggested here. The previous iteration passed the tests. Now running ERT in batch mode with eemacs -batch -l ert -l org-clock-split.el -f ert-run-...
0
votes
0answers
36 views

helm-comint-input-ring - get error: shell-mode-map

windows 10, emacs 26.1, helm 3.0 I use C-c C-l (comint-dynamic-list-input-ring) I get something like this: But I don't like this. I want to use helm-comint-input-ring. I want to get something like ...