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How to log backtrace to a file instead of popping it up and blocking following backtraces

With emacs if there is a backtrace buffer open, new backtrace is ignored. I find it is unconvenient when I am trying to find out which function/hook changes a variable. I use debug-watch as described ...
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How to trigger debugger on emacsclient error

I asked in a prior question about what might be causing my emacsclient widows to shutdown immediately with the following output on stderr: "ERROR: Beginning of buffer". I have tried to use ...
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Possible to find the line or position where an error happens?

With stack traces in elisp, I only see the function and the error that occurred within this function. Is it possible to also include the line number or the character-position where the error took ...
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How can I apply `(toggle-debug-on-quit)` ignore ` Debugger entered Lisp error: (minibuffer-quit)`

I have (toggle-debug-on-quit) in my init.el file due to find a issue that makes emacs hangs. But it also catches minibuffer-quit. Would it be possible to ignore catched errors for Debugger entered--...
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How to automatically open the debugger whenever `kill-buffer` is invoked?

I'm using Elpy for Python development, and when I run code with C-c C-c the source buffer closes -- which I don't want. Have to constantly reopen. One idea is to set a breakpoint in kill-buffer - ...
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What’s the most common way to debug C++ on Mac

I'm wondering what's the most common way to debug C++ programs using emacs for Mac users? I’m currently using gdb, which takes a moment for me to make it work for Mac, so I’m now considering give dap-...
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4 votes
1 answer
116 views

Emacs elisp debugger: How do i make the debugger jump to source when i press s?

The builtin elisp debugger (i.e. the regular one, debug, not edebug) has a default binding of s to command backtrace-goto-source. When I try to use it, it says: Source code location not known You can ...
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dap-mode for nodejs with nodemon

After 5 hours of googling and trying out different configurations i give up. How do i setup dap-mode for debugging nodejs with nodemon so that the debugger restarts when nodemon restarts? Non-solution ...
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  • 221
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1 answer
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Debuggable emacs and vanilla emacs binaries

I'm running Ubuntu 20.04. I would like to build an emacs binary for general usage (no debug symbols) and another emacs binary (when something goes wrong). The build is pretty straight-forward, but I ...
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How to debug emacs config / need to rerun org-mode after startup

I run emacs on Windows and I start with this command: C:\path-to\emacs.exe -q --load "C:/path-to-git-tracked-config-folder/.emacs" --debug-init Emacs starts without error from --debug-init. ...
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When working on elisp where to show intermediate values?

I've only recently started diving deeper into elisp. I've been using message a lot in the past, much like println or print when in other languages. The trouble I have is that I'm writing elisp to ...
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debugging c++ code with dap-mode in Emacs does not display std::variables (e.g., vector, map, etc) correctly. Any idea to solve this problem?

When I debug c++ code in dap-mode with Emacs, the std::variables, such as vector and map, always have values, [0]: std, shown in the local variable area. Does anybody know what is going on? I am on ...
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1 answer
172 views

Examine function arguments after debug-on-error

Here's a common debugging scenario: I am investigating a failure and for whatever reason I cannot instrument the relevant code with edebug. I can, however, in most cases get a backtrace via toggle-...
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4 votes
2 answers
188 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 ...
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How do I debug a flask application from within emacs?

I want to use something like pdbpp or ipdb to debug a flask application. I've tried but not understood how to set a breakpoint in a python file that's part of a wider application and see it hit. There ...
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1 vote
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Debugging with dap-mode for python and taking user input

I am trying to make dap-mode for python working on spacemacs. For the most part I was able to get it working, but I am having issues taking in input on the CLI def main(): a = input(">") The ...
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Tools to develop and debug ELISP code

I have some experience in Emacs-LISP. Today I spent 6 hours writing LISP code that I guess-timate would have taken 1h30 to write in Python because my workflow to develop and debug is very clunky. In ...
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1 answer
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magit commit does not permit adding a gpg signature

I am failing to run gpg to sign commits, after doing so successfully before an upgrade to Mojave and an upgrade to Emacs. (I am not sure when I lost the ability to sign files in the past year.) When ...
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0 answers
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Debugger breaks with Args out of range: "", 0

When forge is installed on a system with no compiler, I sometimes get this error which breaks magit. I'd like to figure out the traceback for this error so I can add some proper error handling, ...
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2 votes
1 answer
193 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 ...
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How to file bug report about frozen emacs

Here what I have MacOS Emacs started with $(which emacs) --daemon using emacs mostly in terminal with alias emacs='emacsclient -nw' and then emacs ~/foo.txt to edit files So right now my emacs ...
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1 vote
1 answer
61 views

How to debug frequent emacs feezes

I have a complex Emacs setup. I love it, except for that fact that it freezes a couple of times a day for me. I have a few suspicion: I use you-complete-me for auto-completion in c++ and it may be ...
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7 votes
3 answers
189 views

Is it possible to edebug a lambda returned by a function?

For example, (defun create-function (number) `(lambda () (* ,number ,number))) (defalias 'square-two (create-function 2) "adds two") (square-two)
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4 votes
0 answers
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Is there an ELISP decompiler?

I'm thinking of writing one so that when I get those horrible tracebacks from bytecode files, I can better see where I was at. Is there one already? Are there any other tools for showing an error ...
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2 votes
1 answer
155 views

Unable to load bookmarks list on emacs master

Whenever I try to execute bookmark-bmenu-list (which loads the bookmarks file), I get the following error: bmkp-multi-sort: Symbol’s function definition is void: bmkp-info-cp. I am running on emacs ...
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5 votes
1 answer
1k views

Debug pytests in emacs

I try to debug my pytest-cases like this: import pytest def test_something() ... ... pytest.set_trace() Then, i execute the tests by running elpy-test. The test starts to run and stops ...
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  • 461
3 votes
1 answer
95 views

How to force `condition-case` to activate the debugger

Often times I need to debug code wrapped in the BODYFORM of condition-case; however, the debugger is suppressed even though I have debug-on-error set to t. The doc-string states that we can add debug ...
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1 vote
1 answer
231 views

Debugging -- debugger-mode -- how to highlight the culprit

Let us take an example such as (max 0 (/ 8 0)) -- the problem is the argument to / -- i.e., DIVISORS cannot be 0. The debugging output looks like this: Debugger entered--Lisp error: (arith-error) /...
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2 votes
1 answer
371 views

Emacs is hanging on almost every word I type. How to identify the problem?

So, that's it. I am writing a lot of LaTeX, and lately emacs is hanging (becoming unresponsive) on almost every word I type, and I have to press C-g to regain control. It started happening around 4 ...
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1 vote
1 answer
143 views

Debugging erratic error

The following error appears every other time that a .tex file is opened: Wrong number of arguments, setq, 3 Enabling toggle-debug-on-error gives this backtrace. How to go about debugging this? I've ...
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4 votes
2 answers
1k views

how to start daemon with `--debug-init` or equivalent debugger?

summary problem I'm trying to debug a problem that involves an Emacs config and daemon startup. But when I run emacs --daemon --debug-init from a console, the spew ends with Loading desktop from /...
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3 votes
1 answer
873 views

Autocompletion of a variable name while Python debugging

Suppose I want to debug Python script in Emacs. M-x pdb run pdb like this pdb script name.py. Next I'd like to examine a variable. I type p and first letters of a variable name, then press Tab and ...
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3 votes
0 answers
459 views

set breakpoint while in debugger?

Is it possible to set a breakpoint on an arbitrary line while already established in browser()? As a use-case: if I debug(myfunc) and while in Browse[2]> ... I realize that I need to jump forward ...
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  • 223
4 votes
1 answer
254 views

Stack reflection in Emacs Lisp?

Are there reflection methods available in elisp to examine the stack without invoking the debugger? For example: Get the calling/callee function Get the function call stack Get the (longer) nested ...
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  • 6,794
3 votes
1 answer
672 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 ...
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  • 6,794
1 vote
1 answer
832 views

Debug org-mode link to PDF displayed with PDF-Tools

Emacs 24.5 on openSuse Tumbleweed. *.org file with a link to a pdf: [[.\somefile.pdf::2][myfile p 2]] I'm using the PDF Tools to display a PDF in Emacs. What I expect is that page 2 of the PDF will ...
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