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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125 views

How can I debug a function that performs most work in a temporary buffer?

I've been able to do this before, but I can't remember the 'recipe' of sorts. Say I've got the following function: (defun fancy-stuff () (with-current-buffer (get-crazy-process-output) (do-...
2
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1answer
2k views

(wrong-type-argument stringp nil)-error when starting dired

Dired used to run fine on my machine (Ubuntu 14.04). But for a while now, i keep running into the error (wrong-type-argument stringp nil). This does not only happen with dired but also with other ...
2
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1answer
65 views

escape or omit binary data in backtrace buffer?

Many times when I check the backtrace buffer, I can't copy the text out because of the embedded binary data (perhaps it's the internal null characters making the copy function think the string is ...
2
votes
1answer
713 views

Debugging server related warning message

I've been seeing this issue for some time now, but I don't know how to debug it. I start up a emacs instance, using say emacs foo.tex & Then I run C-c C-c to compile. A new window pops open, ...
2
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1answer
485 views

Show breakpoints when debugging Matlab

I am using matlab-emacs to debug a matlab script from inside of emacs with GUD. Everything seems to be working as expected except that I don't see any breakpoint indicators in the fringe. This is ...
2
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1answer
113 views

How to use edebug on a function

I am trying to debug a problem with the alert.el package using edebug. However, I am unable to step through the alert function. I expect the debugger to enter the function and allow me to step ...
2
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2answers
176 views

problem with starting emacs via emacsclient

I have no problems starting Emacs from a terminal, while if I start it from the desktop (I have a desktop file containing emacsclient -ca '') Emacs starts with a putt-ugly font (see below a screenshot)...
2
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1answer
84 views

Org agenda suddenly broken after installing org-mac-link

Org agenda is suddenly broken Symbol’s value as variable is void: org-tag-group-re. How to fix it? Diagnosis: The problematic code seems to be this: ;; org-mac-link (push (expand-file-name "~/....
2
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1answer
34 views

Get asked to confirm safe theme forever

I created a theme which I stored in ~/.emacs.d/themes/, added this directory to custom-theme-load-path, and put (load-theme "the-theme.el") in my init.el. Now restarting emacs, I get prompted whether ...
2
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1answer
309 views

Signaling a breakpoint in Emacs Lisp

Many languages have a mechanism to signal an attached debugger to pause or break. For example in JavaScript this is done using the debugger keyword. In others like C# or Visual Basic the signal is ...
2
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1answer
141 views

Get a list of functions evaluated

I am trying to track down a weird bug in my emacs configuration - the cursor, occasionally, jumps to a random location when I am scrolling using the arrow keys, in cc-mode. I don't see any accidental ...
2
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2answers
96 views

Get actual buffer name from backtrace buffer?

I have a buffer foo.el with some invalid code (bar) If i run M-x eval-buffer, with debug on, it show this in backtrace buffer Debugger entered--Lisp error: (void-function bar) (bar) eval-buffer(...
2
votes
1answer
619 views

How can I delete all the gdb related windows/buffers after `q` in gdb CLI window

I use (setq gdb-many-windows t) and (setq gdb-show-main t) configurations in my init.el, so after executing M-x gdb, there will be six windows in the frame, after typing q in the main gdb cli window ...
2
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1answer
766 views

restclient errors “failed with code 111”

When I run GET http://localhost/ with restclient.el, I get the following error in the *Messages* buffer: GET http://localhost:80/] Contacting host: localhost:80 error in process sentinel: restclient-...
2
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2answers
43 views

What tools can help make the emacs debug output more readable?

I was expecting to find tools I can use to to e.g. prettify the stack trace, or e.g. show all variables that are bound at each level of the stack trace as you navigate, but haven't found anything. Do ...
2
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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 ...
2
votes
1answer
125 views

sudden let-alist feature failure

This morning, I wake up and restart my Emacs.app (26.3 GNU Emacs but the emacsformacosx.com version, from brew cask) and get stuck at this: Eager macro-expansion failure: (error "Loading file /Users/...
2
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1answer
138 views

can I use .dir-locals.el to set a default mode for files, and still allow dired?

I have a directory that is all little shell code snippets for being sourced. Tried creating an auto-mode-alist, that does not seem to be effective, so tried creating a .dir-locals.el thusly: ((nil . ...
2
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1answer
91 views

M-= shortcut suddenly stops working in Emacs in KDE

I'm trying to run M-= on a region of text, but nothing happens. I think the shortcut is registered (I don't get a message like "M-= is undefined") but the execution stops for some reason and there is ...
2
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1answer
5k views

Wrong type argument: stringp, nil

I am essentially trying to build a list of strings, where each of those strings in turn are built by their own functions. However, I get the following error when the code is evaluated: Wrong type ...
2
votes
1answer
907 views

Emacs lisp throwing error when using spell check

I am trying to configure Hunspell in my emacs running in windows. When I type M-x ispell-buffer, I get the following error: Debugger entered--Lisp error: (wrong-type-argument stringp nil) string-...
2
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1answer
89 views

Debugging in elisp

I am having a fairly big .emacs file with lots of stuff inside, parts of which I have copied from somewhere else. At some point in the file I am setting the font size to some value but this setting ...
2
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1answer
334 views

gdb-many-windows causes hangs in emacs 24.5

When running gdb -i=miand then attach to the process for debugging, emacs hangs for like 5 minutes before I can type anything. After trial and error I found it is caused by the following line in my ...
2
votes
1answer
109 views

Why use the “and” in (funcall (and initial-major-mode))?

I came across this code today, and do not understand why the author used the "and" in it. As far as I can tell, these two lines deliver the same results and have the same functionality. The variable ...
2
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1answer
44 views

A possible incompatibility between `toggle-frame-maximized` and a mode using `visual-line-mode`

I have (toggle-frame-maximized) in my init file. If I enable the ospl-mode (btw very handy mode) given in the answer https://emacs.stackexchange.com/a/473/, then I minimize the frame, Emacs (GNU Emacs ...
2
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1answer
262 views

Debugging a “binding stack not balanced” bug?

I'm trying to figure out how to approach a bug I've run into. I assume it's actually a bug in Emacs, but I don't know the right way to make headway with it. In short, I'm getting the message "binding ...
2
votes
1answer
321 views

Make comint-mode behave more like term-mode

I am constantly getting frustrated with the GDB comint-mode buffer when using GUD. Somehow my cursor always ends up straying from the bottom of the buffer, and then my input is not interpreted how I ...
2
votes
1answer
83 views

How can I debug a hang when debug-on-quit doesn't work?

I have a problem with haskell-mode where Emacs will hang every time I open up a Haskell file. Mashing Ctrl-g a few times will get the file opened. So I would imagine setting debug-on-quit would allow ...
2
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0answers
218 views

Valgrind interface for emacs

Is there an interface similar to 'gdb-mi' for using Valgrind in emacs? What are some ways to use Valgrind inside emacs?
2
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0answers
328 views

How to diagnose emacs hanging and 100% cpu on startup?

How can I diagnose this issue? I've tried using strace and I see the following that seems to be stuck in a loop: recvfrom(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., ...
2
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1answer
90 views

Halting Clojure debugger after pressing the Continue Command

I use Emacs with Cider to debug Clojure Code. After setting a breakpoint using the default debugging framework, there appears the list of debugging options one might execute shown in this Figure I ...
2
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0answers
1k views

Extremely slow startup on Windows - How to debug?

I have a serious problem with an extremely slow spacemacs startup (emacs-init-time = ~200s). (The server works, but this is so slow I cannot debug some other problems that I am trying to fix) My ...
2
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0answers
722 views

debugging: how to optimize a RealGUD workflow

I code in Python and I my workflow uses debuggers (I coded for 8 years in Matlab). I develop numerical simulation codes: most of the time it returns a result, the question is: "Is the result right?" ...
2
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0answers
378 views

The Application Emacs is Not Open Anymore (macOS High Sierra)

I am using Emacs (25.2.1) on macOS High Sierra 10.13.2, and when trying to open a simple .txt file using Emacs as the editor, I get the error "The application Emacs is not open anymore". Details: ...
2
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0answers
231 views

`<dead-grave> is undefined`

for a few month, I use Emacs for Latex, and I am French. today (for the first time) when I use C-c ` to see my errors, Emacs answers <dead-grave> is undefined I try to add in my .emacs (...
2
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0answers
65 views

inhibit-read-only affects all buffers when *Backtrace* buffer is open

I use buffer-read-only as a safety measure for anything that is important. Recently, I have been debugging functions that use inhibit-read-only and I leave the *Backtrace* open to go about my ...
2
votes
0answers
69 views

how can I debug or fix slowness in org-cycle?

running org-cycle appears to hang sometimes. I've run M-x profiler-start <tab> ;; bound to org-cycle C-g ;; to cancel apparently-hung command M-x profiler-report and I see that a bunch of time ...
2
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0answers
553 views

init error: file missing - cl-generic after any time I edit settings.org file

I am using org mode to organize my various Emacs settings. Within my init.el file I just have (taking out initial comments): ;;; Code: (package-initialize) (eval-when-compile (require 'use-package))...
2
votes
1answer
65 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"...
1
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2answers
191 views

How to debug lack of response to a certain set of keystrokes?

Suppose I do a certain keystroke sequence in emacs, and nothing happens, even though I expect there to be a keybinding that would do something. This could be because: The keybinding is not actually ...
1
vote
2answers
101 views

Problem with giving inputs to a function programmatically

Some programs take user inputs, for example by calling the interactive function `sunrise-sunset', two arguments are taken from the user. Assume that the inputs are 0.0098 and 51.4934 (these are ...
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
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1answer
1k views

“Symbol's function definition is void: org-agenda-skip-scheduled-if-done”

I've recently started using Org-mode, and when I last restarted Emacs, I got the error message Symbol's function definition is void: org-agenda-skip-scheduled-if-done. Upon opening Emacs again using --...
1
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2answers
38 views

Why does `narrow-to-region` complain that its args are not `integer-or-marker-p`?

I have some functions that depend on smart-parens code. (defun outer-paren () "Move point to the outermost parenthesis." (interactive) (ignore-errors (while t (up-list))) (sp-...
1
vote
1answer
62 views

How to navigate stack frames in Emacs debugger?

I'm trying to debug the infamous Unrecognized entry in undo list undo-tree-canary, and after having Emacs debugger triggered on error, I want to move back and forth between stack frames and to examine ...
1
vote
1answer
465 views

How to debug the “message” function on entry ?

While debugging a minor mode (separate issue), I wanted to generate a stack trace of the message function so I thought I would just enter M-x debug-on-entry RET message I was quite surprised to see ...
1
vote
1answer
213 views

Unable to quit emacs with `Wrong type argument: hash-table-p, nil`

I have some customisations in ~/.emacs.el. Today I refactored a piece that used dolist, directory-files, and find-file. I am now unable to quit Emacs in the normal way and I get this from the mini-...
1
vote
1answer
365 views

Need help with `expand-region`: Symbol’s function definition is void: org-outline-overlay-data

If I try to use er/expand-region but it fails with Symbol’s function definition is void: org-outline-overlay-data. org-version : Org mode version 9.2.2 In the release notes for the current org (9.2),...
1
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2answers
190 views

How to fix org-dotemacs broken by latest update?

I'm sorry to have to ask this, but lisp debugging is not one of my strengths. For some time I've been happily using Joe Bloggs's somewhat hoary but useful org-dotemacs.el system to maintain my emacs ...
1
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1answer
41 views

What does `#[0` (hash angle bracket 0) mean in the elisp debugger?

When using the debugger I get lines like the following in the stack trace: #[0 "\302\303!\210\300\211\207" [describe-input-method this-command helm-mode 1] 2 "\n\n(fn)"]() I have no clue what the #[...

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