is a process of finding and reducing the number of bugs, or defects, in a computer program, thus making it behave as expected

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2answers
394 views

How to call in a kernel level function in user space [closed]

I've developed some helper functions in the kernel. They're called by other functions in the kernel. Currently, they make my custom kernel panic :( For now (i.e. debugging), I made them as a passive ...
2
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0answers
29 views

Significance of Linux kernel's default_console_loglevel

What is the significance of default_console_loglevel in Linux? Commonly I see it described as the default value of console_loglevel. However, what that means I haven't seen explained anywhere. ...
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0answers
295 views

How to change the console_loglevel in linux?

I read at multiple places (e.g. here http://elinux.org/Debugging_by_printing), that you can change the console log level by echoing an integer to /proc/sys/kernel/printk. If that worked shouldn't the ...
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1answer
35 views

Linux server as a target for my C code [closed]

How to use a linux server as a target for my C code written on a different (Windows) machine. Including step by step debugging and etc... All that with Eclipse Env.
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2answers
180 views

viewing printf after pipe (or subshell?)

Ok, this is hard to distill to a single question because it really depends on how I'm going to troubleshoot it. The following script is meant to pipe mount.cifs commands to a while loop that enters ...
2
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1answer
178 views

“Debugging” with bashdb: why do I lose command echo after stepping into a simple script?

I heard about the bash debugger ( bashdb ) after reading a comment so I thought I should try it out and see if it can help me analyze bash scripts or more generally the execution of commands. There ...
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0answers
119 views

ath0 wi-fi connection breaks

Can't hold wi-fi connection in hostapd mode. Sometimes it's good, sometimes not, yesterday all day wi-fi works, today no chance even to connect. % more /etc/rc.conf wlans_ath0="wlan0" ...
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1answer
131 views

What is the impact on system performance when kernel debug info is enabled?

In order to debug kernel or use tools like stap (https://en.wikipedia.org/wiki/SystemTap) kernel must be compiled with full debugging information included - namely option CONFIG_DEBUG_INFO has to be ...
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2answers
461 views

Error - Segmentation Fault

I am trying to run DQN, which is some AI for Atari. Upon launching the program (sudo bash run_cpu < the_name_of_the_game >), I get the following error: run_cpu: line 46: 9377 Segmentation ...
0
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1answer
96 views

Linux Mint 17.1 Mate stops responding

I was using LM 17.1 Mate version quite smoothly until one day I found my desktop wallpaper had changed to the original. Then after refreshing for 2nd time it keeps on refreshing and it seems that my ...
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0answers
52 views

How to debug freeze at start, output of syslog

Every now and then, my computer freezes while starting. I can see some "Oops" in /var/log/syslog, but from there I am not sure what to do to try and fix the problem. Jun 5 12:47:40 fulla kernel: [ ...
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6answers
19k views

Can we get compiler information from an elf binary?

Is there some chance to know how a binary was built, under Linux? (and or other Unix) Compiler, version, time, flags etc... I looked at readelf and couldn't find much, but there might be other ways ...
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1answer
98 views

gdb displays not all variables in KDevelop [closed]

Hoping, the image describes the issue much better than I can do. Generally, I'm debugging a multithreaded application in KDevelop with gdb. I'm debugging the app step by step (F11 shortcut) and have ...
0
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1answer
174 views

USB not working : USB Ports Hijacked/Reserved Permanently by VirtualBox

This scary incident happened today morning. I started a virtual machine inside my Linux Mint host and shared my USB Wireless device with the machine. The virtual machine's image resided in an ...
2
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0answers
213 views

What is the correct way to fix the configure error: “Requested 'libdrm_nouveau >= 2.4.33' but version of libdrm_nouveau is 0.6”?

This issue came up when trying to assist a user with the questions: What are the required build dependencies of mesa for Debian-based distros? and How do I backport Mesa on Debian Wheezy?. Mesa on ...
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0answers
72 views

How to debug : Screen starts blanking after running wget

My system is currently running Cubieez 2.2, a Debian image for CubieTruck. My bash script is tasked with downloading driver files from a server to a specific folder through wget. I've tested this bash ...
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1answer
651 views

How to debug an installed Qt5 library with GDB?

Background: I am programming with Qt5 and want to debug the core Qt5 libraries on Debian using GDB. I have installed all the necessary -dev and -dbg packages. When I try to debug, GDB complains that ...
4
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1answer
104 views

Print out unicode values of stdin?

I use od to print me the octal or hex of a file/stdin/string. This lets me see the ASCII, or UTF-8 encoded, values of my stdin. But we don't live in ASCIIland anymore. Is there any command that will ...
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0answers
206 views

Transfer file to pc from embedded linux device via serial communications

I'm working on an AT91SAM9G20. I'm connected to AT91SAM9G20 via the debug port using rs232 serial communications. It has Linux version 3.4.8 but does not appear to have any of the common file ...
1
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1answer
58 views

How to generate a list of configuration files accessed by a tool (eg bash or vi)?

Many times, there are slight inconsistencies between two similar linux machines, where (for example) tmux supports colours on Machine M1, and does not support colours on Machine M2, or vi adds ...
2
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0answers
128 views

How can I monitor the interactions of an application with dbus?

I think the title says it all. I have a set of applications, I want to montior any and all interactions of the applications with dbus. The things I've played with don't seem to have a way of focusing ...
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2answers
2k views

Is it possible to strace the builtin commands to Bash?

Inspired by this question, titled: When are the built-in commands loaded to memory, while attempting to answer this I tried the following command and was a bit surprised that I couldn't run it: $ ...
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2answers
755 views

Tools for Debugging Routing Tables on a Linux Machine?

Is there a tool that debugs routing tables on a Linux machine? I mean one that I can use by inputting an ip address into it, it'll take the existing routing table into account and output the ...
0
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1answer
151 views

How to find out what the Cinnamon process does

I would like to identify what draws power in Cinnamon (the process not the entire desktop) aka what eats the cpu and causes the context switches. It is not about finding out what draws power overall ...
1
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1answer
203 views

Which log files do I look at to debug copy/paste and Klipper?

Short Version What log files do I look at to monitor copy/paste actions? And what logs do I look at to monitor all Klipper actions? Long Version After using my desktop for a while (could be a few ...
9
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2answers
5k views

Can gdb debug suid root programs?

I wrote a program that calls setuid(0) and execve("/bin/bash",NULL,NULL). Then I did chown root:root a.out && chmod +s a.out When I execute ./a.out I get a root shell. However when I do gdb ...
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1answer
190 views

Debugging multiseat: How to run two X server layouts together without display manager?

How to run two X servers together, each with its own layout, directly from command line, without any display manager (e.g. GDB, KDM or LightDM)? Lets say there are two ServerLayout sections in ...
0
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1answer
4k views

“Failed to complete SSL handshake: NSS error -5938.” while connecting with the retrace server

Having installed Fedora 21 and found that it works very nicely (unless you want dropbox, hardware acceleration in some things, decent video drivers & codecs etc), I have recently turned to ...
22
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2answers
40k views

Running application ends with “Segmentation Fault”

I have a command line application that when run does not do what it is supposed to do and at a certain point leaves the message: Segmentation fault What does this mean? What should I do?
2
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3answers
133 views

Is there a simple way to find out the last line executed in a bash script?

In answering this question please bear in mind that I am a beginner and a bit out of my depth. I'm running a bash script which contains a for loop which will run thousands of times. Somewhere in this ...
4
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2answers
4k views

Is there a GUI debugger for shell scripts

Debugging bash scripts on command line is complicated. Is there a good GUI based debugger available for debugging bash scripts?
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2answers
334 views

How do I view executables run by a program?

Is there a way to view or get a list of executables that a program uses? A particular example is file-roller. Is there a way to see which executables it uses, if there is more than one executable it ...
4
votes
1answer
635 views

wpa_supplicant nl80211 hangs linux mint frequently

My Linux Mint system (17 Cinnamon, lenovo g565) hangs up frequently during work (say, 2-4 times a day). It may look different - white screen, black screen, screen freeze. Checking syslog after hangs ...
3
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4answers
2k views

Sound Problems with pulseaudio

The overall question that my whole problem is kind of based on is regarding sound in linux. Should I be using alsa or pulse or what? I'm using pulse at the moment and this is my problem: I was in the ...
2
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1answer
116 views

m4 macro using variable number of tabs to line up a column

This is the macro I have so far: define(`debug_macro', ` #ifndef $1_DEBUG #define $1_DEBUG'forloop(`i',`1',eval(5-(len($1)/4+ifelse(eval(len($1)%4 == 0)), `0', `1')),` ')dnl`0 #endif ') The goal ...
0
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1answer
175 views

frequent linux mint hangs

My Linux Mint system (17 Cinnamon, lenovo g565) hangs up frequently during work (say, 2-4 times a day). It may look different white screen black screen screen freeze Maybe some of these symtoms ...
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0answers
99 views

Linux unresponsiveness

I'm using a Packard Bell EasyNote laptop (4GB RAM, 500GB HDD) with Arch Linux and xmonad. My problem is that machine becomes fully unresponsive or obtains a large lag. Sometimes when I only have a ...
0
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1answer
129 views

python3-dbg fails to import setproctitle

import setproctitle using python3 works, but using python3-dbg fails. How can I fix this? $ cat test.py from setproctitle import setproctitle setproctitle('test') $ python3 ./test.py $ python3-dbg ...
2
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2answers
3k views

Monodevelop doesn't run the project. When I try to run nothing happens

I've been trying to get Monodevelop up and running for almost a week now, first on my redhat and now on my fedora. The debugger doesn't work, when trying to debug I get this error: I tried ...
18
votes
3answers
14k views

How to know where a program is stuck in linux?

I am running the following command on my ubuntu server root@slot13:~# lxc-stop --name pavan --logfile=test1.txt --logpriority=trace It seems to hang indefinitely. Whenever this happened on AIX, I ...
0
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2answers
213 views

How to launch «gdbserver» in background?

I am communicating with a device via a serial port, and for I am launched «gdbserver» (like gdbserver :2345 myapp) it completely blocks the terminal. Neither an ampersand & symbol, nor ^z ...
3
votes
1answer
210 views

Echo out lines of script before running them

Is there a way to run scripts in bash that makes it so that it prints each line of the script before executing it? This would be really useful to me for debugging... $./myscript.sh echo "Hello" ...
2
votes
1answer
382 views

SystemTap simple demo fails

Started learning SystemTap using RedHat's manual. Here is the example I'm trying to run. While executing stap open.stp I got the error: [root@ror6ax ~]# stap open.stp semantic error: while resolving ...
2
votes
1answer
816 views

set -xv behavior in ksh vs bash

Normally I like to have all of the debug output of a script go to a file, so I will have something like: exec 2> somefile set -xv This work very will in bash, but I have noticed in ksh it ...
6
votes
1answer
539 views

Is there a way to see if process listening on TCP port receives a message?

According to tcpdump, my server receives the following TCP packet: 12:52:29.603233 00:19:e2:9e:df:f0 00:16:3e:6a:25:3f, ethertype IPv4 (0x0800), length 74: 10.10.10.65.38869 192.168.215.82.22: ...
7
votes
3answers
2k views

How can I find what is interfering with CTRL+F?

I'm running LinuxMint12 with Gnome with Cario-Dock and I have a logitech G15 keyboard. I set up a bash script with the extra keys to take the active window, resize it, and move it to a specific ...
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0answers
450 views

How to display printk messages filtered by level as they come?

I wrote a hello word module that performs a printk when it is loaded in level ALERT and another printk when it is released with level INFO: #include <linux/module.h> #include ...
24
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3answers
2k views

How can I see the exact command line being executed inside some bash instance?

I have a long running bash instance (inside a screen session) that is executing a complex set of commands inside a loop (with each loop doing pipes, redirects, etc). The long command line was ...
2
votes
1answer
97 views

Why is my Compose key not being passed to Synergy?

The key that I assign to the compose key (right Alt) is not passed to the remote computer by Synergy. I don't know if it's a problem with Synergy or with X, but my guess is that the compose key is ...
0
votes
1answer
969 views

GNOME 3 - bottom panel is hiding - how to unhide it or change behaviour

After upgrading Debian Wheezy to Jessie, I experience some random unhiding behaviour of the bottom panel. It does not appear - as before - by moving the mouse into lower right corner. It seems it is ...