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 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
107 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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1answer
3k 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 ...
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3answers
5k views

Linux network troubleshooting and debugging

From time to time Linux and Unix users faced with various network problems. Many of these problems are presented here and at some others troubleshooting forums, but the are very concrete and contains ...
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2answers
2k views

Missing separate debuginfo for - GDB

I have mentioned -g option along with -Wall in the Makefile. When I run gdb onlineSunday, I get: Missing separate debuginfo for /usr/lib64/kde4/plugins/imageformats/kimg_dds.so Try: zypper install ...
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1answer
320 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: ...
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1answer
186 views

How to debug a buggy running GUI application?

Suppose the GUI applications are not given names in its GUI, so you don't know what to check in 'ps -A', i.e. the nameless applications in the task bar. How do I know which GUI application belong to ...
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0answers
99 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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1answer
5k views

how can I make cron run a job right now, for testing/debugging? without changing the schedule!

I have a cron job that is scheduled to run everyday, other than changing the schedule, is there any other way to do a test run of the command right now to see if it works as intended?
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2answers
614 views

Unix/Linux C++ debugger that supports STL containers?

Currently I am using gcc-4.3.6 and Eclipse IDE for c++ development. I want to debug my project in Eclipse with gdb. I am having a hard time debugging code when it contains STL containers. Also I am ...
6
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1answer
956 views

How to debug system freeze?

I'm experiencing strange bug when I close lid of my laptop - system freezes (no reaction on keys, no response form ssh) hard and displays some strange colour effects. The kernel log (after reboot) ...
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2answers
2k 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, ...
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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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2answers
1k 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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2answers
1k views

strace for library calls

I know of strace, which is super handy for watching system calls. Is there an equivalent that can trace calls to external libraries? For example, I'm trying to debug some SSLeay misbehavior with a ...
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2answers
3k 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?
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1answer
84 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?
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1answer
1k views

What is the difference between /proc/self/stack and output from pstack?

I have been looking through the documentation for /proc and the "stack" object being a new'ish object in proc, I have also looked through the kernel commit to create it -- however the documentation ...
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1answer
107 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 ...
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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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1answer
374 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
2k 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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0answers
539 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 ...
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1answer
144 views

Sending commands to dbx from Vim

Using this information, I've been able to debug code using dbx and display the code from within Vim. What would be really cool is if I could send commands (step, next, print, stop in ... etc) to dbx ...
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5answers
418 views

Unpredictable memory explosions

The main server at my company has recently been having a lot of downtime. For reasons that neither I nor the other admins can determine, it has random (VERY sudden) explosions in memory. It becomes ...
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2answers
308 views

Unclaim a device

So I am using Ubuntu and trying to use some hardware which I had some problems with before. The problem before was that the company who made my hardware sold their internal parts to another company ...
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2answers
999 views

Dump process core without killing the process

Is there a way to get a core dump (or something similar) for a process without actually killing the processes? I have a multithreaded python process running on an embedded system. And I want to be ...
3
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1answer
437 views

Capture and log GDB backtraces without stopping the process

First, a brief description of the situation: a computer sits hidden near a display in a gallery of some sort, acting as the silent workhorse for a piece. Despite its programmer's best intentions the ...
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1answer
578 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
263 views

Is there a way to find out which program is segfault-ing?

I have a Busybox/Linux system where a mystery program is segfaulting rarely. Is there a way to find which program is doing this?
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4answers
2k views

Kernel Hacking Environment

I have been working in embedded OS like uCOS, ThreadX. While I have coded apps in Linux, now I’m planning to start learning Linux Kernel. I have few questions regarding the environment. Which is ...
4
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4answers
2k views

Debugging Linux machine freezes

I have 15 identical Linux RH 4.7 64-bit severs. They run cluster database (cluster is application level). On occasion (every month or so) a random box (never the same though) freezes. I can ping the ...
3
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1answer
611 views

How does a debugger work in Linux?

How does a debugger work in Linux? How does it gets 'attached' to an already running executable or process. I understand that compiler translates code to machine language, but then how does debugger ...
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2answers
2k views

How do I debug a kernel module in which a NULL pointer appears?

I have a custom kernel module that I compiled from this patch that adds support for the logitech G19 keyboard among other G series devices. I compiled it just fine against Ubuntu's maverick kernel's ...
4
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2answers
317 views

How to debug an inserted kernel module?

I would like to debug a loaded kernel module I don't have the source code to; I suspect it's a virus. Is there a way to feed it into GDB for analysis?
3
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3answers
606 views

Debugging ethernet before NFS boot

I'm trying to boot Linux from U-boot on an embedded ARM board using a filesystem on a remote machine served via NFS. It appears that the ethernet connection is not coming up correctly, which results ...
10
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4answers
3k views

How can I debug a Suspend-to-RAM issue on Linux?

I'm hoping to get experience-based suggestions on how to go about debugging suspend-to-RAM issue. Advice specific to my situation(detailed below) would be great, but I am also interested in general ...
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3answers
301 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 ...
7
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3answers
516 views

Best practise to diagnose problems [closed]

As Linux/Unix users, we run into problems frequently. And after long hours of problem solving, we develop the skill of debugging. Now, what are good principles, methods or best practises when trying ...
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3answers
1k 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
206 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 ...
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5answers
6k 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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5answers
2k views

How to track/fix a memory-related issue in a large C/C++ code on *nix systems

What strategy you use while tracking a memory-related issue? What tools do you use (open source as well as proprietary) to identify memory leaks, memory corruption etc? How would you track memory ...