Debugging is the process of examining the state of a program - generally with a debugging tool - while it is running and attempting to find bugs that cause it to behave abnormally.

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What's the best way to avoid catastrophe caused by negligence?

I have been a programmer for almost 1 year. As an ADHD adult, naturally I don't have the same strength of attention on ordinary stuffs as my colleagues do. And I find the catastrophe made by me are ...
90
votes
14answers
7k views

Leaving intentional bugs in code for testers to find

We don't do this at our firm, but one of my friends says that his project manager asked every dev to add intentional bugs just before the product goes to QA. This is how it works: Just before the ...
0
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1answer
58 views

Why NOP/few extra lines of code/optimization of pointer aliasing helps? [Fujitsu MB90F543 MCU C code]

I am trying to fix an bug found in a mature program for Fujitsu MB90F543. The program works for nearly 10 years so far, but it was discovered, that under some special circumstances it fails to do two ...
0
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2answers
25 views

How do we sequence logs from different services in a system?

So, if I am designing a system as a set of different roles (client, app-server, backend services 1 to n). Each of these roles will have their own logging mechanism. I can aggregate all the logs at one ...
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0answers
26 views

Debugging a windows application: how do I catch a menu-item click? [closed]

I need to know what MS Word does when I perform this sequence: "FILE" menu "Options" item "General" tab "Theme selection" listbox "OK" button I think I need a debugger, but of course I do not have ...
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0answers
14 views

How do I debug a python multiple-sentence generator? [migrated]

I made my own Python code like this: import random # nouns----------------------------------------------------------------------------------------------------------------- nouns = 'noun1 noun2 noun3 ...
-1
votes
1answer
31 views

Difficulty translating specs into rending HTML/CSS [closed]

Our small shop excels at data modeling and algorithms, but we increasingly face challenges getting the presentation and rendering correct. I would like others to explain to me which strategies are ...
0
votes
0answers
48 views

Curiosity: Unassembled asm in Windows Bootloader

I found this little gem waiting for me in the Windows (10/TP) bootmgr located on the first 300+- MB partition. Can anyone explain to me what it does? Is there an assembler hidden somewhere? These all ...
-2
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0answers
17 views

Please tell me where I've gone wrong [migrated]

#include <stdio.h> main() { char name1[15],name2[15],name3[15]; int no; printf("Enter the serial number and name one\n"); scanf("%d %15c',&no, name1"); printf("%d %15s\n\n",no,name1); ...
9
votes
5answers
226 views

Correctly disposing objects upon server termination

I am working on a large C++ project. It consists in a server that exposes a REST API, providing a simple and user-friendly interface for a very broad system comprising many other servers. The codebase ...
12
votes
5answers
567 views

How can I encourage people to read error messages? [duplicate]

I was wondering if there are some good ways to encourage people to read error messages when the compilation fails. People (especially) the junior ones usually ignore the error messages and just ask ...
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1answer
73 views

Is software inherently buggy and hence, vulnerable? [duplicate]

Could no amount of formal analysis, type/rule checking prevent it's exploitation? How about a fully verified kernel such as SEL4 ?
5
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6answers
494 views

When should you start unit testing? (during which development stage?)

I'm currently learning about unit testing, specifically JUnit (with Java). Searching the web I see many threads talking about why you should use it, what type of methods you should use it with but I ...
1
vote
1answer
80 views

How to debug minified javascript on production? [closed]

I have a front end single page app deployed on S3. It is minified on production. It creates error only when it is minified via grunt on production. I cannot repro the issue in dev. How do I go about ...
6
votes
6answers
1k views

What is the actual reason that locks (sentinels) in OO are hard to reason about? [closed]

In this talk, Rich Hickey introduces Clojure. He gives an Ants demo and talks about his motivations for implementing a Software Transactional Memory (STM) system. His reasoning for STM is that ...
3
votes
2answers
325 views

How to avoid long call chains?

I have a hierarchy of objects, mostly connected by composition. I.e. (not showing the class methods for readability): class A {} class B {A a;} class C {B b;} etc... class Z {Y y;} class Z provides ...
0
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1answer
79 views

Extending a class for debugging: public API, hidden implementation or something else?

I'm working on a fairly large project that involves 3D drawing, and I want to add some visualizers (for example, to see the bounding boxes of the objects) to make debugging easier. However, I'm having ...
1
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1answer
118 views

Debugging xml and annotations

By now, most web containers have an annotation variant of their xml configurations for Java EE. I'm guessing this is because it's better to keep things in Java where they can be managed, coded with ...
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2answers
78 views

Debug symbols change application execution [closed]

I have to set up remote debugging for a multi threaded application running on a embedded device. C++ is the language. I've gotten so far and got the remote debugging working for a simple application, ...
2
votes
1answer
228 views

Writing software without unit testing

Usually, when I write software, I use unit tests for each function to test if it is working without any problems. However, recently I have found myself writing some software that are not really ...
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1answer
177 views

Illustrate Meaning of : gcc -g programName.c

To debug a C program using gdb effectively it is required to compile it first using the command: gcc -g programName.c otherwise on using simply gcc programName.c and running we are unable to ...
0
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2answers
117 views

can a logic error happen way later than its cause? [closed]

For comparison, for a runtime fatal error, it is often that the cause of the error is way before the error crashes a program. For a logic error, it doesn't crash a program. It happens when the state ...
3
votes
4answers
128 views

What is your approach to debugging a transient problem [closed]

I am working on a system that controls a label printer and occasionally the label printer will print the same label 2,3,...,10 times. The error is transient, occurring once per 3000-4000 (once a ...
12
votes
3answers
697 views

Debugging memory corruption

First off, I do realize this is not a perfect q&a style question with an absolute answer, but I can't think of any wording to make it work better. I don't think there is an absolute solution to ...
3
votes
1answer
132 views

Android testing - bugs not reproducible [duplicate]

We have the following problem: at the end of the iteration we give our Android app to our customers to test. Our customers report bugs that are not reproducible on our test devices. How can we deal ...
5
votes
3answers
314 views

Declaring variables in Python and PHP

The question is how to cope with absence of variable declaration in Python, PHP, and the like. In most languages there is a way to let the compiler know whether I introduce a new variable or refer to ...
4
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3answers
147 views

How do I fix an “emergent” bug?

I'm writing a PDE solver, and I have a bug that only shows up in very large test cases. That is, with small grids the program gives correct answers, but there's a large amount of unaccounted-for error ...
2
votes
2answers
85 views

Does anyone still use logic analyzers for debugging real time systems?

Many years ago when debugging real time systems (such as the ones used in telephone switches) we had to use logic analyzers (which read execution straight from the CPU) or emulators (which physically ...
2
votes
2answers
56 views

Methodology To Determine Cause Of User Specific Error

We have software that for certain clients fails to download a file. The software is developed in Python and compiled into an Windows Executable. The cause of the error is still unknown but we have ...
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4answers
308 views

Why do browsers these days ship with dev tools [closed]

I just read a question asking how Facebook blocks console-based script attacks. The reason for this block was to prevent a recently famous "hack" where one would trick a user to inject a malicious ...
11
votes
5answers
838 views

Learning to investigate bugs [closed]

I'm not even sure how to define this difficulty. It reminds me of the test a couple of prospective employees did on me before I got a job. They would pick an object in the room and then I'd be allowed ...
14
votes
3answers
620 views

How to locate source code that implemented a certain feature?

I was wondering what are some techniques to locate which code implemented a specific feature, on a desktop application. I am a junior developer, with only professional programming experience lying ...
1
vote
11answers
491 views

Is debugging a waste of time? [duplicate]

I work on a lot of projects for fun, so I have the freedom to choose when I want to finish the project and am not constrained by deadlines. Therefore, if I wanted to, I could follow this philosophy: ...
0
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1answer
83 views

debugging web applications using debug parameter

A suggestion has been made by a team member to leave all debug code intact in our web pages... and then to create a variable that can be turned on / off to enable / disable debugging. This is a ...
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5answers
439 views

Should unit-tests be entirely self-contained? [duplicate]

As the title suggests my question is whether or not unit-tests should be entirely self-contained or can one rely on the results yielded by previous tests? What I mean, in case that it isn't entirely ...
3
votes
4answers
1k views

When should a database table use timestamps?

First a note, I thought maybe this question belonged in the database exchange, but I think it is more broadly related to a programming solution as a whole than to databases. Will move to database ...
4
votes
3answers
456 views

Is printing to console/stdout a good debugging strategy?

Let's say we have a function like this: public void myStart() { for (int i = 0; i<10; i++) myFunction(i); } private int myFunction(int a) { a = foo(a); a = bar(a); return a; } ...
2
votes
3answers
242 views

Debugging checklists: How much it's necessary to have? [closed]

Should making debug-checklists be an essential part of development process? How it can be integrated with unit-tests? Update Debugging checklist: Think about it as your troubleshooting checklist -- ...
10
votes
8answers
3k views

How should one debug a PHP web application securely without exposing secrets to competitors?

Recently I made a program. I forget to delete 2 line of codes. That mistake cost me $800 per day every day. I was programming with PHP. If a visitor uses proxy it redirect somewhere else. Using ...
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vote
4answers
275 views

How to trace logical errors in algorithms [closed]

I am beginner in algorithms. Last year I participated in Google Code Jam. One of the major issues I faced during the competition was my code was working fine on my test cases, but when I submitted on ...
4
votes
2answers
318 views

How do you build debugging messages into your programs/scripts?

General, high-level question for people who work with code regularly. I was repurposing some old, outdated Javascript code into a Chrome extension, and to help me understand it, I wrote some quick ...
1
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2answers
79 views

API for expanation of complicated calculation or business rules?

In online shops there are areas with complicated rules. For example is a product visible in the product catalog is a product sold out what is the price for the product (Discounts, Promotions, ...) ...
3
votes
2answers
224 views

Verbose or concise logging [duplicate]

I was wondering how much data should be logged. I know this deeply depends on multiple factors. But it can still be hard to find the golden middle way. Lets say I have an application where people ...
1
vote
3answers
312 views

How do you avoid looping mistakes? Mistakes that are not detected by systems [closed]

I had this crazy initialisation -- documentList = new ArrayList<Map<String,Integer>>(); which I intended to store a new map everytime in a loop but unfortunately put itself inside the ...
-3
votes
2answers
223 views

What are the signs that a ten days debugging session will not resolve an issue? [closed]

Ten days ago, we fixed a bug on a large application and the hot fix has created a disappearing of some data from the user point of view (side effect). Data are not deleted, but have been set to hidden ...
2
votes
2answers
278 views

Is it realistic to use designers for complex UI [closed]

When I created my first web application few years ago, I remember trying to use the designer in VS 2008. Before I can even remember I abandoned it to the favor of actual debug to understand how my UI ...
54
votes
14answers
3k views

Is it reasonable to insist on reproducing every defect before diagnosing and fixing it?

I work for a software product company. We have large enterprise customers who implement our product and we provide support to them. For example, if there is a defect, we provide patches, etc. In other ...
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votes
1answer
165 views

PHP developer, how to solve javascript related issues in a program with millions of line [closed]

I am expert in PHP. There are some JavaScript related bugs in my assignment given by my supervisor. I tried to fix them using Firebug. It is time consuming. Is there any other ways? Are there any ...
2
votes
2answers
298 views

When is it okay to log filename/line information for errors?

We have a closed-source commercial C++ application. Some of our logged error messages are in plain English like "ERROR: could not read file 'foo'". While others use a macro to print filename/line ...
1
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3answers
321 views

What techniques are there for debugging remote client side errors?

What techniques are there for debugging remote client side errors in a web application, especially when they only affect a small subset of users? In my case we have an app that is working well for ...