Questions tagged [gdb]

The GNU Debugger usually called just GDB

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gdb/gdb multiarch does not work on my ubuntu

currently I'm running xv6 on qemu on Ubuntu machine, the version is buster/sid On one terminal I start qemu like this, seems ok ~/xv6-labs-2020# make qemu-gdb *** Now run 'gdb' in another window. qemu-...
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wsl1 - How can I gdb a 32-bit Intel 80386 executable file in wsl1 ubuntu 18.04?

I was trying to debug a 32 bit executable file named bof-baby in wsl1 (Since I cannot connect to the network once I upgrade the wsl1 to wsl2) Environments host machine: Windows 10 pro 1909 (18363....
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Qt5 installer does not find debugger

I installed Qt5.15.2 with the online community-version installer on Ubuntu 20.04. In QtCreator I find the compilers but not the debugger. On my system I also have GDB: $apt policy gdb gdb: Installed:...
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51 views

How does a newer version of a package disappear from apt-get install?

I have two Ubuntu 18.04 servers at my office that are for development work, and we have the GNU Debugger installed. All of these packages are always installed using the "sudo apt install" ...
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Is gdb (GNU debugger) version 10.1 on Ubuntu 20.04 WSL?

So I'm using Ubuntu wsl version 20.01 (from the Windows Store), and just want to know if gdb 10.1 is on ubuntu 20.04. I know gcc and g++ are in version 10.1, since I downloaded and updated them using ...
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gdb vmlinux file returning Ignoring packet error, continuing

i installed ubuntu kernel debug symbol https://bugs.launchpad.net/ubuntu/focal/amd64/linux-image-5.4.0-40-generic-dbgsym/5.4.0-40.44 on ubuntu 20.04 lts virtual machine I opened up 2 ssh terminal on ...
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Can not debug step by step using gdb in ubuntu 20.04

I am trying to gdb to debug a program step by step, but I found that when the program stopped by hitting a breakpoint, and I use n or s to debug it step by step, the program just continue to execute ...
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73 views

Is “Ubuntu Desktop for Developers” different from “Ubuntu Desktop”?

Is "Ubuntu Desktop for Developers" different from "Ubuntu Desktop"? If so, how do I download the Developers' version. I want to make sure that I get things like gcc, g++, gdb, ...
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32 views

Two different core files generated at different occasions of application crash

I wanted my C++ application to produce core dumps when it crashed, so I followed this advice: https://stackoverflow.com/questions/2065912/core-dumped-but-core-file-is-not-in-the-current-directory ...
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gdb won't attach to process

I'm having trouble running a remote gdb becuase the attached process is already being traced. I run: gdbserver localhost:12345 --attach 142 But I'm told process 142 is already traced by process 127 (...
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299 views

Prompt is marching across the screen when entering gdb TUI

I'm debugging a program: // t.c #include <assert.h> int main() { assert(0); return 0; } gcc t.c -g gdb ./a.out (gdb) r Starting program: /home/user/a.out a.out: t.c:4: main: Assertion ...
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487 views

what is the difference between gdb and gdb-peda?

I have tried to search on google but still could not find anything that i understand. Can anyone tell me the difference between them? And which one is better to debug c++?
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target sim Undefined target command: “sim”. Try “help target”

Please who can help, I tried to use 'target sim' in gdb but I get the below error (gdb) target sim Undefined target command: "sim". Try "help target" it was actually working on my ...
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Problem while attaching GDB debug for 3D slicer in Ubuntu 20.0.04

I am facing a problem while attaching the GDB debugger in linux in order to debug 3D slicer code. I have read the documentation of 3d slicer in order to debug in Linux. Whenever I try to attach the ...
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.coredumpctl pid weird alignment

While starting my first use of coredumpctl, I have noticed a repeated occurrence of a bug. I have created a small snippet which contains a stack BOF vulnerability (compiled with no stack protection). ...
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202 views

gdb on Ubuntu 19.10 showing wrong variable values

Since upgrading to Ubuntu 19.10, gdb (8.3) is nearly unusable using programs compiled using the default gcc (9.2.1) using -O0 -ggdb -g3 because most displayed values for variables are wrong. The ...
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1answer
480 views

Ubuntu 19.10 gdb nearly unusable long delay

I am having a problem with the gnu debugger on Ubuntu 19.10. The problem presents itself as a long delay, somewhere between 20-30 seconds between running my program with gdb and my program actually ...
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705 views

gdb error for keepassx/keepassxc: “Cannot find user-level thread for LWP” “generic error”

I tried to run gdb on keepassxc, but encountered an unfamiliar error: $ gdb /usr/bin/keepassxc GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git Copyright (C) 2018 Free Software Foundation, Inc. ...
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50 views

Is there an Ubuntu developer installation which comes with full C/C++ development envirenment installed?

I do not want to download source code for gnu gcc/g++/gdb/make... and compile from scratch. I am OK with downloading a built and ready to use set of packages. But best of all, I am looking for an ...
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162 views

Manually compile and install debugging symbols for the recoll package?

I've got some crash files for recoll from which I would like to extract a symbolic stack trace. Unfortunately, there are no debug symbols available for this package, so my stack traces are mostly ...
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2k views

How to solve warnings from GDB?

I need help about debugging GIMP 2.10.10 O.S. Ubuntu 18.04.2 LTS GDB Version (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git I get this message from GDB when i try to generate a backtrace inside flatpak ...
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TrueStudio “Could not determine GDB version command” error

I am working with TrueStudio. I face with this error when click Debug button. https://imgur.com/YWEyf9i How can I fix this problem? Before this in the build step I saw another warning as you can see ...
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2answers
7k views

Core file not generated in Ubuntu 18.04

I was trying to generate a core file in Ubuntu 18.04. My program generates a core file, but I'm not able to find it. $ ./a.out Segmentation fault (core dumped) $ ls -lrt total 32 -rwxrwxrwx 1 sanjay ...
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2answers
3k views

g++ and gdb problem: debug symbols for shared libraries not found

I am porting a large set of applications and libraries from Debian 7 to Ubuntu 16.04. This is a GNU autotools project, so libtool is involved. gdb cannot find the symbols for the majority of the ...
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1answer
1k views

netbeans missing native build tools

My Goal I want to have a fully functioning NetBeans C/C++ on my ubuntu 18.04 A small background The first problem I've encountered was build host not connected after a little research I've ...
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985 views

Upgrade to python 2.7.15 (for gdb 8) on Ubuntu 16.04

I am running Ubuntu 16.04 with gdb version 7.11.1-0ubuntu1~16.5. When I upgraded g++ to g++-6.4 (Ubuntu 6.4.0-17ubuntu1~16.04), gdb started giving python errors like: Python Exception <class '...
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717 views

How to set up debugger for ARM Assembly using qemu and gdb

I followed this tutorial as well as this one to set up a compiler + debugger for ARM Assembly. Following the first one, I ran the command qemu-arm -singlestep -g 1234 emptyand started a new shell, ...
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7answers
39k views

How can I install “gdb-arm-none-eabi” on Ubuntu 18.04 (Bionic Beaver)?

In previous versions of Ubuntu, GDB for ARM Cortex processors was part of the package gdb-arm-none-eabi. Searching https://packages.ubuntu.com/ for gdb-arm-none-eabi for Ubuntu 18.04 doesn't return ...
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1answer
2k views

False “application not responding” box is creating havoc with GDB

I'm trying to debug a C++ application using GDB and the Qt Creator IDE. Every time the debugger stops on a breakpoint, Ubuntu (v 17.10) thinks the application is frozen and issues the dialog box with ...
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328 views

GDB not available after “make install” unless a new terminal is opened

I'm fairly new to Ubuntu and development on Linux in general. After building GDB from source (pre-installed the dependencies): $ git clone git://sourceware.org/git/binutils-gdb.git $ CD binutils-gdb $...
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1answer
4k views

debugging in codelite - “GDB: Failed to set controlling terminal: Operation not permitted”

while debugging in codelite this error appears in the terminal : could anyone help me solving this problem?
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3k views

gdb during startup program exited with code 127

I am using Ubuntu 17.04, I am having problem with gdb. I am using CLion and Netbeans for C++ programming, when I debug code, it's throwing me this error During startup program exited with code 127. I ...
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3answers
2k views

Cannot install GDB on Ubuntu 17.10 due to Python dependency issues

I had to uninstall GDB just to upgrade to 17.10, but now I can't get it installed again. sudo apt install gdb Reading package lists... Done Building dependency tree Reading state information......
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2k views

gdb-qemu : can't put break point on kernel function ( kernel 4.10.0-35)

I am trying to debug the Ubuntu kernel using KDB + qemu. However, I am not able to debug it. Following is the error I am getting. Can someone help? Starting QEMU: sudo qemu-system-x86_64 -enable-...
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1answer
274 views

Debian 4.9.3 - downgrading gdb, which version i need? [closed]

I can't work with Eclipse's debug stepping due to gdb version 7.12 not supporting certain option: Failed to execute MI command: maintenance set python print-stack off Error message from debugger back ...
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1answer
1k views

GDB can't break strcpy()? [closed]

so im trying to debug this simple c program #include<stdio.h> #include<string.h> int main(){ char str_a[20]; strcpy(str_a,"Hello, world!\n"); printf(str_a); return 0;} gcc -...
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1answer
552 views

What would cause an installed application to not be recognized as such?

I need to revert my version of gdb back to a previous release so that it is compatible with a certain tool. I currently have gdb 7.7.1 installed. If I enter gdb into the terminal and hit enter, gdb ...
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1answer
708 views

gdb skips breakpoints without sudo

I'm trying to debug simple 8-line program with gdb: $ g++ -g 1.cpp $ gdb a.out (gdb) break 5 Breakpoint 1 at 0x40089e: file 1.cpp, line 5. (gdb) run However, gdb will just skip over the breakpoint ...
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1answer
1k views

Gdb pretty printer is not working in Ubuntu 16.04

I have debugged C++ codes using gdb in Ubuntu 14.04. When I pass a stl container to the print command, it used to print the contents of the container. But then I upgraded to Ubuntu 16.04 LTS a week ...
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1answer
3k views

How to output web page html source code into a file

My goal is to output an html source into a file, I'm using w3m to browse the web from terminal. When using the following command on terminal: w3m <url> -dump the program displays the web site ...
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1answer
4k views

Is ctype.h installed in my system?

I am running 16.04. My C program uses isdigit(int). I get the following when I run it under gdb: `Breakpoint 1, check_tok (token=0x6f7c20 <tokens> ".t") at outline.c:150 150 unsigned char *tp=...
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1answer
3k views

When I run the debugger: “failed to set controlling terminal” [duplicate]

In a book I read, the author's CPU was 32-bit. Mine is 64-bit. I run the NASM assembler in the terminal with: nasm -f elf -g -F stabs asmwork/eatsyscall.asm Then I run the linker: ld -o eatsyscall ...
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251 views

Port Ubuntu Touch using Windows 10 ubuntu bash

I'm trying to port Ubuntu Touch to my phone using Windows 10 bash. After many try, i stuck on building the test image for Nexus 4 to check possible it's or not. And every time after starting building: ...
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2answers
3k views

Putting some lines in a script to execute them in gdb

I want to create a script or actually a shortcut to surf in peace #!/bin/bash konsole -e firefox --debug (gdb) handle SIGPIPE noprint nostop pass (gdb) handle SIGSEGV noprint nostop pass (gdb) run ...
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2answers
1k views

gdb - load kernel module for remote debugging

Ubuntu 14.04 LTS: peter@peterubuntu0:$ insmod mymodule peter@peterubuntu0:/sys/module/mymodule/sections$ cat .text .data .bss 0x0000000000000000 0x0000000000000000 0x0000000000000000 So how do I ...
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1answer
2k views

GDB arrow keys not working

The up arrow key in gdb is not scrolling through previous commands on one of my ubuntu machines (kudu) but is working on another (similar) machine (cs13): karl@kudu:~$ gdb --version GNU gdb (Ubuntu 7....
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387 views

Have Qt Creator execute gdb command after all libraries are loaded

I would like to setup Qt Creator debugger to ignore all boost files when stepping through my code. Just to test, I added the command: "skip file /usr/include/boost/ptr_container/ptr_sequence/...
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1answer
1k views

Stop or disable keyboard/mouse/input grab from shell

I am trying to debug a full-screen application which uses OIS for input. The program grabs control of mouse and keyboard. When I hit a breakpoint (i'm using gdb), I cannot continue, step, or do ...
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1answer
4k views

How to enable Qt Creator 3.2.2 to use GDB?

After installing Qt Creator 3.2.2 from source I tried to run my project with Qt Creator's debugger frontend, but instead of starting to debug I got an error from Qt Creator: The selected build of ...
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1answer
9k views

How to get an apache core dump?

I am having problems with my 14.10 Ubuntu Server. Upon performing certain actions my apache2 restarts with a segmentation fault error. In order to debug this issue I would like to create a core dump. ...