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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76 views

Understanding line numbers reported when using eval

Okay, so I'm stuck working with a shell script that needs to use eval (I know, I know, ultimate evil etc…) however I'm having difficulty debugging some of the line numbers being thrown out by errors. ...
3
votes
1answer
105 views

detect process that executes portscans

I have to administer an ubuntu 12.04 server, where there seem to go portscans to the whole subnet. How can I find out the process that does the scans? pstree init─┬─acpid ...
3
votes
1answer
219 views

How to increase ftrace precision to microseconds?

I'm trying to generate FTrace files inside an Android environment, using: root@adroid:# echo 1 > /sys/kernel/debug/tracing/events/sched/sched_switch/enable root@adroid:# echo 1 > ...
2
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2answers
78 views

whats a good tool to search tail -f output

I am dumping some debug info into a text file that I am using tail -f to monitor. Is there a tool that I can then pipe that tail -f data into to be able to search the text on screen using regular ...
2
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1answer
85 views

Submitting bug reports for Arch Linux

I come from Ubuntu and when things crashed I could collect the relevant information and submit a bug report. Is there an easy or preferred way to do this in Arch Linux after an application crashes?
2
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1answer
144 views

How can we trace problems of crashing programs in Linux?

If an application crashes in Windows we can check the Event Viewer in the Administration tools to see what has crashed. Sometimes it has useful information others not, but it is a start. In linux if ...
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4answers
77 views

Is it possible to trace Linux source from initial bootup to desktop-GUI userland code?

I am wondering if, since Linux is 100% open-source, it is possible to follow line-by-line instructions of Linux to observe how the OS works entirely, so that one may get a better knowledge of how OSes ...
2
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1answer
424 views

Debugging dmesg logs

I noticed I have the following in my logs. I just am not sure as to how to go about figuring out how to fix or find out what is causing them and if they are serious. [582046.956291] Core dump to ...
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1answer
2k views

Kernel and QEMU : Unable to mount root fs error

I am trying to run a distro in the virtual disk image with a custom kernel,so that I can experiment and debug the kernel. I followed this to make a disk image and then install Debian to it. Now I ...
2
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1answer
4k views

How to debug csh scripts?

My lab uses csh scripts to run jobs. It is usually difficult for me to debug a shell script, so I'm wondering if there is a csh debugger I can use. I know there are some flags like -x or -v that can ...
2
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1answer
412 views

Installing slime and emacs

I'm trying to install SLIME on Fedora 17 so that I can do some lisp. Here is what I downloaded: http://www.common-lisp.net/project/slime/#downloading The CVS Snapshot link. I have a .emacs file: ...
2
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3answers
324 views

Kernel debugging

I would like to study the flow of some linux device drivers and some minimal flow of kernel (threading cum context switching and interrupt management). How can I debug the linux kernel? What are the ...
2
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1answer
214 views

How can I figure out why gnome-panel is frequently misbehaving?

On my system (Debian Lenny AMD64), gnome-panel seems to act up now and again. I've not found a way to force it to happen, but it seems to be related to launching processes. Basically, I launch some ...
2
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1answer
80 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 ...
2
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2answers
51 views

How to tell which files have been created by an application?

I want to find out what files an application has created or modified. In the old days it was easy. cc foo.c created a.out, cc -o foo foo.c created foo, cc -c foo.x created foo.o. Now applications ...
2
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1answer
214 views

How can I run gdb in one machine and run kgdb kernel in another machine?

I want to run two machine: debugged machine: compiled kernel with kgdb option. debugger machine: for running gdb How can I debug machine 1 from machine 2?
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votes
1answer
814 views

Debugging Linux Kernel with QEMU

I was trying to study the debugging of kernel using QEMU. I tried initially and failed due to the fact that there was no virtual file system. The answers to this post suggests that there should be a ...
2
votes
1answer
123 views

Start and stop multiple executable for easy debugging

I'm debugging a networking project, which involves interacting of 3 programs, ie a server, two different clients. However I find it difficult to start and stop them for debugging. Some methods I have ...
2
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1answer
400 views

Disable browser logging output to console

I'm currently using Ubuntu 11.04 and I'm running into a really annoying issue while developing for web. I'm rather new to Ubuntu, coming from FreeBSD where I never encountered an issue like this, so ...
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2answers
51 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 ...
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0answers
57 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 ...
2
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0answers
56 views

Is there an equivalent of addr2line on AIX system?

I'd like to debug proftpd on AIX and according to the documentation, addr2line is a usefull binary to identify what is not working. Extract of proftpd debugging documentation: The key here for ...
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0answers
166 views

How should I enable the trace log for ALSA hda_unsol_event?

I have reported an ALSA kernel bug and have been asked to "enable tracepoints" and "check the response of hda_unsol_event". I was directed to the kernel docs for instruction, which say: Except ...
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0answers
465 views

My Debian freezes

I installed a fresh Debian 7 install, but it freezes from time to time, and when it happens (quite often indeed) only the mouse can move around but everything is blocked. All I can do is restart. I ...
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0answers
52 views

kgdb not returning control to gdb

I've compiled a kernel with kgdb support and I'm trying to debug it. I have two machines running, a debug machine (running the kgdb kernel) and the machine I'm using to debug it. They are connected ...
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0answers
103 views

How to find where driver.mod.c links to?

I'm trying to port the webcam composite gadget from kernel 2.6.37 to 2.6.32. I don't have a choice on this since I depend on other drivers and a SDK which only compile for this version. My train of ...
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0answers
602 views

Linux kernel slab usage growing on embedded system

I'm in the process of QA/debugging a project on a custom embedded linux system. The problem we're VERY tight on memory, and even a couple megs can cause issues with our software. What I'm seeing ...
2
votes
1answer
659 views

Dump Page table layout (KERNEL CONFIG)

While configuring kernel for debugging found this option: CONFIG_X86_PTDUMP: Export kernel pagetable layout to userspace via debugfs Does this mean RAM page-table layouts ? any guides on how ...
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2answers
2k views

How to proceed solving ppp connection problems?

I got an embedded system trying to create a ppp connection using a GSM modem. However the connection is never established and all I get is this error message in syslog: Oct 12 08:38:48 pppd[451]: ...
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3answers
287 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 ...
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1answer
276 views

Bash option to get resolved executable path?

Bash is able to trace execution script commands with the -x command line option. Each command is then output to stderr, prefixed by PS4 as stated in the man page. -x After expanding each ...
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3answers
98 views

How do I know on which IDE to edit a project's source code?

EDIT: Thanks to all answerers and commenters, there's enough material to keep me busy for a while ! I recently switch to Linux and wanted to do my first development steps with the following ...
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1answer
126 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
88 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 ...
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2answers
305 views

How to “listen” to nginx writes to a file socket

I'm trying to get uwsgi and nginx to play nice. After moving to "file sockets" (hopefully I'm using the right terminology here) from TCP sockets, the only thing I get from uwsgi is a 400 with no ...
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1answer
64 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 ...
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1answer
283 views

Killed `rm` and `cp` on nfs share

I am just testing an rsnapshot installation on my laptop which should backup to a NAS mounted via nfs on my laptop. On one test rsnapshot died with a cp -al problem (i.e. a problem with hard links) ...
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1answer
234 views

Resolving executable user stack trace addresses in ftrace

I'm trying to obtain a user stack trace in ftrace, but for some reason, only my user program cannot resolve the addresses to symbols. First, the OS I'm using is: $ uname -a Linux mypc ...
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vote
1answer
266 views

How can I force my wifi to connect to a G-band channel?

I'm trying to debug a buggy wireless card and would like to force my Linux computer to connect using one of the g-band channels. How can I achieve this?
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2answers
2k 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 ...
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1answer
480 views

Best practices for attaching debug symbols to system libraries during development?

I'm at a stage in a project where it would be really handy to have a debug version of a system package installed. On Ubuntu at least, adding the debug symbols to a library is a piece of cake. ...
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1answer
571 views

How to avoid overflowing the kernel printk ring buffer?

I'm trying to debug a linux driver and a particular piece of code is behaving very strangely. In order to see what's going on I've filled the code with printk statements so I can see exactly what the ...
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1answer
156 views

Linux, Debugger program development

We are trying to implement the debugger program which will takes either PID or Program name as input and Invoke the gdb by using PID. Below is two small programs are written, Not able to figure out ...
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1answer
1k views

How do I fix a noisy input device (Internal Mic)? snd_hda_intel - debug included

As the title says, I'm having trouble with a very noisy audio input device - the internal mic or any plugged in mics. So far I've narrowed it down to an problem in ALSA since my debug info is showing ...
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1answer
124 views

Is there any way to attach latrace to an already-running process?

I want to trace a running multi-threaded process's library calls. As of 5 November 2012, there's only one way to get ltrace to fully support tracing multi-threaded processes: you must check out and ...
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vote
1answer
2k views

Unprettyfied SSL error message?

I am trying to authenticate using my USB smartcard reader to a website. I am running Ubuntu 10.04 LTS, with its most up to date Firefox browser 3.6.24. I get the following error message: Secure ...
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0answers
42 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 ...
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0answers
54 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 ...
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1answer
46 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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0answers
65 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 ...