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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How to let kernel not run the printk with KERN_DEBUG

I noticed that kernel has different console levels for the printk. I also noticed this post [1]. I understand that we can change the /proc/sys/kernel/printk to change the printk level for the ...
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145 views

Linux Kernel module Remote Debugging with GDB + KGDB, Remote 'g' packet reply is too long

I am trying to remotely debug Linux Kernel and I am having issues. My setup: Target machine with Ubnutu Linux with my custom kernel 4.3 which I built with debugging information and KGDB. ...
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2answers
232 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 ...
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146 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
60 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 ...
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1answer
231 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 ...
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1answer
209 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 ...
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494 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 ...
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3k 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 ...
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1answer
334 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. ...
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267 views

Why is the service unavailable the second time?

How can this happen? /volume1/homes/me $ tdtool --list /volume1/homes/me $ tdtool -e 44 Learning device: 44 - Could not connect to the Telldus Service /volume1/homes/me $ tdtool --list Error fetching ...
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444 views

How to trace calls to library from library?

I have an program that calls libcurl, and libcurl calls libgssapi_krb5. If I want to debug calls to libcurl, then ltrace works. But now I want to debug calls to libgssapi_krb5, then ltrace ...
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1answer
2k 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. ...
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2answers
104 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 ...
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2answers
270 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 ...
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1answer
25 views

Why is echo not working for mt valgrind command?

So I have my makefile working great, except that It doesn't create the valgrind.out file and I don't know why. So the console succesfully prints out that my executable file line is created but not ...
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1answer
61 views

Is there a GUI debugger for csh script?

I have read another question in UNIX & LINUX stack exchange. The GUI provided in that question can be used to bebug *.sh file. How about to debug *.csh file? What other plugins for eclipse can I ...
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1answer
89 views

Uninstalling packages installed by debuginfo-install

How do I delete debug packages that are installed by debuginfo-install? When I search for them via sudo yum list installed none of the installed packages are listed, even when I enabled the debuginfo ...
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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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1answer
165 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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1answer
214 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 ...
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1answer
189 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 ...
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1answer
5k 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 ...
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1answer
188 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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1answer
1k 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 ...
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1answer
73 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 ...
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1answer
12 views

Generic debugging / logging / tracing filesystem directory & file access? [duplicate]

This is my particular problem: I'm trying to set up git on a server, for which I'm doing a test on a locally installed apache on Ubuntu 14.04; for instance, I can do git clone fine over HTTP, but git ...
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1answer
18 views

Storing PHP output issued by crontab

I have a PHP file that is suppose to send one email per day scheduled by crontab. Here is my crontab: 45 23 * * * php /var/www/html/linus/class/runnable/dailyStaffReport.php I noticed that it's not ...
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23 views

How to debug a bash script in a qemu-arm chroot

I'm running a debian debootstrap script which creates an arm system. However, the script fails at some point and the error message does not really help. So I'll have to do some more debugging which is ...
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17 views

Does Manjaro Linux have a debug packages

One of my biggest frustrations with Arch Linux is the need to recompile half my OS every few weeks in order to provide meaningful bug reports to upstream projects. Most other distributions provide ...
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1answer
43 views

Debugging: OwnCloud horribly slow

I am trying to figure out why my OwnCloud installation stalls of 10s of seconds before it runs again for 10s of seconds normally. What kind of debugging can I enable on OwnCloud (server+client), so I ...
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35 views

printk does not prints in terminal

I inserted some printk in kernel 3.15.1 functions such as theese: in fs/read_write.c in function read(): printk("Ata: Im in fs/read_write.c and in function read"); in same file in function ...
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1answer
76 views

Syntax error: Unterminated quoted string. Cannot find error

I'm writing a script to parse a larger file into usable data. I will attach the script below. The script was not running as I wanted and I thought it might have been the if/then statement I used, but ...
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40 views

OpenVPN Connection without disabling Internet debugging

I've recently configured OpenVPN on my server (CentOS 7) and been configuring it for hours now and everything seems to work fine except that when I connect using a client machine I cannot access the ...
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19 views

Breakpoint in dynamically-linked libraries in Linux

Suppose you debug a Linux application and put a break-point into a function defined by a dynamically-linked library used by the application. Will that break-point stop any other application that makes ...
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46 views

Cannot telnet to Postgresql Forwarded Port

I'm trying to portforward a PostgreSQL port using my DLINK ADSL Router. I have the following IP addresses. Public Internet IP 197.321.321.32 PostgreSQL 192.123.123.12:5432 (Port To ...
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0answers
40 views

How can I display \n as new lines in multitail?

I am using multitail to monitor logs while I program. I really like this tool. However, it is hard to use it to view object output in a php error log because new line characters \n are not processed. ...
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1answer
39 views

SystemTap simple demo fails - Ubuntu 14.04

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 ...
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1k views

Kernel panic : Kernel offset disabled

I was trying to install the linux-next kernel in my system with the following steps. Copied the existing configuration file from /boot to the root of source directory Updated the .config file with ...
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55 views

Attempting to use LogLevel debug to investigate server issue

I am currently running a WordPress Multisite installation with a number of websites active. I have started getting large volumes of the following error message in my error log: Request exceeded the ...
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0answers
137 views

Can't install additional debug infos in the CentOS 6.7

I am attempting to debug coredump of the some application on the latest CentOS 6.7 and gdb gives me hints that some debug infos are missing, for example: Missing separate debuginfo for ...
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0answers
529 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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0answers
62 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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1answer
118 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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1answer
119 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 ...
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82 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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108 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 ...
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1answer
1k views

How do I get debug information from rsyslog?

I followed the directions from: http://www.rsyslog.com/doc/debug.html I put the following in /etc/rsyslog.conf: $DebugLevel 2 $DebugFile /root/RSYSLOG.txt then I try: kill -USR1 `cat ...
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1answer
153 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 ...
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2answers
1k 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?