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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2
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156 views

linux mint hangs - how to find a reason?

My Linux Mint system (17 Cinnamon, lenovo g565) hangs up frequently during work (say, 2-4 times a day). It usually looks like a white or black screen (or off if the lid was closed). CPU seems to be a ...
6
votes
2answers
294 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 ...
3
votes
1answer
334 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
votes
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
votes
1answer
72 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
votes
1answer
119 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 ...
0
votes
0answers
232 views

Analyze backtrace of kernel panic on Android

I have this problem on my Samsung Galaxy Note 2 LTE with random reboots and kind of clean restarts in the kernel logs (no oops / panic, even though some usb errors) and now I got a kernel panic in the ...
0
votes
0answers
88 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
votes
1answer
78 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
votes
2answers
2k 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 ...
16
votes
3answers
5k 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
votes
2answers
123 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
136 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" ...
1
vote
1answer
265 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
477 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
448 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 ...
1
vote
0answers
308 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
votes
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
67 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
528 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 ...
5
votes
1answer
564 views

Can anything useful be done with a truncated core?

We have processes written in a mix of Python, Java and C++ that core dump from time to time. They allocate more memory in chunks as needed during runtime, and are known to crash when their allocation ...
9
votes
3answers
6k views

How to debug a suspend problem?

I used to have Fedora 14 installed on this HP Compaq 610, and the suspend feature worked fine. Now that I've installed Scientific Linux 6.1 suspend doesn't work anymore. How do I debug/fix it?
1
vote
2answers
339 views

Double click Linux Bash Script and debug with pause commands

I'm fairly good with windows .bat scripts and normally use the pause command while developing them so I can see things step by step as the script runs in the command prompt. I am trying to do ...
1
vote
3answers
182 views

Bash script in ( set -x ) mode does not display what “cat” command does. ( contents of it )

in this bash script.. it simply shows.. +cat as it runs. #!/bin/bash set -x cat > /test << "EOF" a b c d EOF but i rather show everything that it does . including the a b c d ...
15
votes
2answers
1k views

How to find out what process is writing to STDOUT?

I have two instances of a process running. One of them is "frEAkIng oUT!" and printing errors non stop to STDOUT. I want to kill the broken process but I have to make sure I don't terminate the wrong ...
1
vote
0answers
2k views

What does “Cannot make/remove an entry for the specified session” mean?

Instead of logging me in, PAM greets me with the message "Cannot make/remove an entry for the specified session" after I enter the password. What entry is it talking about (and what session)? The ...
3
votes
1answer
156 views

How to save the result of printf to a variable in GDB?

(gdb)printf "Hello %d", 7 Hello 7 (gdb)set $MyVar = printf "Hello %d", 7 // ??? How to save the result of printf "Hello %d", 7 to $MyVar?
3
votes
1answer
140 views

How to make gdb not ask me “y or n”?

When I use GDB command add-symbol-file to load the symbol, GDB always asks me 'y or n', like this: gdb> add-symbol-file mydrv.ko 0xa0070000 add symbol table from file "mydrv.ko" at ...
5
votes
2answers
5k views

How to enable crash reports/core dumps/stack trace logging globally?

Crashing bugs can be the most annoying ones, leading to data loss, downtime and frustrated users. It would be good if applications crashed less. Because of the complexity of the machine context, ...
3
votes
1answer
75 views

Methods to find out which (configuration) files are read by executable when started

What are the clever ways to find out which (configuration) files are read by executable if started? For example snmpd or sshd. One option is probably to check the CONFIGURATION FILES or FILES section ...
2
votes
1answer
125 views

sysrq-trigger doesn't accept parameter 'g'

I'm trying to debug the kernel. But I couldn't trigger kgdb with echo g > /proc/sysrq-trigger, it just prints help message. I have enabled kernel debugging, kgdb over serial, frame pointer etc. ...
1
vote
2answers
5k views

How to detect a possible hardware error?

I'm running Debian Wheezy on a HP Pavilion dv7 laptop and it freezes every now and then, requiring a reboot. One time it didn't even load the operating system, but it wasn't I who was using it so I ...
2
votes
2answers
167 views

How can I remotely debug a broken initrd?

Background I have a system that runs Linux. It's a NAS, and does not have any monitor, keyboard, or serial port. It does have a network port. I'm not happy with the software running on it, and am ...
6
votes
2answers
426 views

How to determine what instructions a process is executing?

I know about strace and ltrace, but that only tells me what system calls and library calls a process is executing, respectively. I would like to know exactly what instructions a process is executing. ...
3
votes
0answers
47 views

Kernel bisect: when a patch is failing for a reason other than original bisect purpose, what do you do? [closed]

Let's say you're trying to find the cause of a bug between 3.11.0 and 3.12.0. The bug is really difficult to catch, because it may or may not manifest itself over several days of regular workload ...
9
votes
4answers
406 views

How can I tell if the currently executing bash script has been invoked with -x for debugging?

I have a script launch.sh that executes itself as another user so as to create files with the correct owner. I want to pass -x to this invocation if it was originally passed to the script if [ ...
4
votes
3answers
241 views

Adding comments using 'set -x'

Sometimes it is really handy to just add set -x to the top of your script to show all commands before they are executed. There is only one drawback creating scripts with a decent output: I don't ...
4
votes
1answer
1k views

How to dump USB traffic?

I got an USB gamepad and I would like to see and inspect the signals and commands that this peripherals is actually sending to my PC/kernel: how I can do that ? I was assuming that something like ...
3
votes
0answers
153 views

An obscure autotools error with Epson iscan project

I'm seeing the following error when attempting to build iscan using the master branch on Debian wheezy. This project provides support for Epson scanners, in cases when SANE doesn't. This project ...
1
vote
1answer
212 views

What's a good way to debug issues with X forwarding over ssh where just some applications won't run?

As far as I understand it, X forwarding is usually pretty simple. Once I can run some things like xeyes or gimp over ssh, complex applications like firefox/iceweasel should also be able to run. ...
0
votes
1answer
1k views

How to enable printk selectively?

I want to print some statements from kernel but not all. So can I use printk selectively? By selectively I mean I want to enable printk only at particular places and disable it everywhere else. ...
1
vote
1answer
206 views

How to extract running Apache configuration from core dump?

Apache is loading the configuration from files into its memory. If the config files are changing the Apache process won't activate it until a reload/restart happens. Now I have to debug the current ...
0
votes
1answer
658 views

Debug program in eclipse with a newly built compiler

I recently tried to build the new version of GCC (4.8.1) on Ubuntu 12.04. I managed to build everything correctly, it passed the tests and I installed the new compiler. I can build programs with the ...
1
vote
2answers
159 views

Why does Linux print a lot of debugging messages on boot/shutdown?

Why does Linux print a lot of debugging messages during the boot and shutdown processes? The boot/shutdown processes usually have no error. Why not hide the debugging messages, and show them only ...
0
votes
2answers
94 views

Emacs how do I interpret this Lisp debugger report

I am trying to make up a .emacs file on my new Fedora 20 computer, and get this line when I use emacs -debug-init &. I expect it to be a trivial mistake, but I find the help on this too detailed ...
0
votes
1answer
63 views

Script in C shell skipping over last else statement?

This is a C shell script that checks the number of arguments and if the file/directory exists. When the arguments are valid, it should go to the last else statement and print "hi", but when I run this ...
0
votes
2answers
542 views

System too slow [closed]

My linux system is responding very slowly.I should wait to get the result of my command. How can i investigate to know the problem of his behavior?
2
votes
1answer
271 views

Best practices for maintaining error logs (system, device driver & application)

I have many Pandaboards with Ubuntu armhf and one PC server networked with Wi-Fi. On each embedded board I have a real-time application running constantly. I don't know how to reasonably maintain the ...
8
votes
2answers
1k views

How exactly does printk work internally?

I know printf needs help from the OS to do its job. I also know printf does not work in the Linux source code as there is no library. And so we have printk for debugging. How does printk work ...