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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3
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0answers
23 views

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

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
274 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
145 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 ...
11
votes
2answers
722 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 ...
4
votes
1answer
51 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 ...
1
vote
0answers
32 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 ...
1
vote
0answers
46 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 ...
14
votes
2answers
888 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?
1
vote
1answer
39 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. ...
5
votes
1answer
198 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 ...
1
vote
1answer
83 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?
0
votes
1answer
87 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
54 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 ...
1
vote
2answers
80 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
0answers
22 views

Can I use lldb to remotely debug the Linux kernel?

With GDB, I can remotely debug the Linux kernel. lldb, which promises to completely replace GDB, should be able to remotely debug the Linux kernel too. However, I cannot find any tutorial about this ...
0
votes
2answers
54 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
36 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
90 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
67 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 ...
1
vote
3answers
215 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 ...
2
votes
0answers
55 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 ...
7
votes
2answers
592 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 ...
2
votes
2answers
49 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 ...
1
vote
0answers
63 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 ...
4
votes
1answer
49 views

Methods to diagnose why an application works for local user account but fails on a network user account?

I have setup a CentOS 6.5 machine that is attached to my company's domain. The OS is configured to allow Active Directory authentication so we do not have to have separate usernames and passwords to ...
2
votes
0answers
50 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 ...
1
vote
0answers
33 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. ...
2
votes
1answer
117 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 ...
1
vote
1answer
196 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 ...
10
votes
2answers
695 views

Observing a hard-disk write in kernel space (with drivers/modules)

Apologies in advance if this post is a bit dense/messy, but I'm having a hard time formulating it better... Basically, I would like to study what happens upon a hard disk write, and I'd like to know: ...
2
votes
0answers
141 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 ...
1
vote
1answer
244 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 ...
0
votes
0answers
20 views

Multiply 2 array index variables shell programming [duplicate]

How do i multiply 2 array index variables given the following foo=(1 2) bar=(0.1 0.2) foobar=$((foo[1]*price[1])) # this is wrong echo "$foobar" Current output : 0 Correct/Expected output : 0.4
0
votes
1answer
96 views

what are some of the best resources to learn advanced debugging techniques using gdb? [closed]

I know the basics of how to use gdb. But I would like to learn some advanced debugging techniques using gdb. What are the best resources - books, blogs, tutorials - that any of you use regularly. I ...
1
vote
0answers
88 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 ...
1
vote
2answers
241 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 ...
2
votes
1answer
191 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?
3
votes
0answers
69 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. ...
2
votes
4answers
74 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 ...
0
votes
1answer
42 views

Getting Sublime + xDebug to work on Debian

I have been trying to get sublime and xdebug to work on debian, but have had no luck. I can't seem to find any debian specific guides. I have tried using the ubuntu based guides, but they don't work ...
1
vote
3answers
92 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 ...
1
vote
0answers
423 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 ...
3
votes
2answers
1k views

Install debug flash player in Chrome?

I am trying to adapt the instructions from here, here, and here to install the debug version of the flash player on my Ubuntu 13.04 installation such that Chrome 30.0.1599.66 can use it. ...
2
votes
1answer
381 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 ...
5
votes
2answers
394 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: $ ...
0
votes
1answer
232 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 ...
3
votes
4answers
2k views

How to view core files for debugging purposes in Linux?

I want to view the contents of a core file while debugging a program. How can I view the contents of a core file?
3
votes
1answer
101 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 ...
2
votes
2answers
77 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 ...
12
votes
2answers
871 views

Equivalent of “truss -T” and “truss -U” on Linux?

Is there an equivalent of what the -T and -U option of the truss Solaris utility does on Linux. Those are to specify a system call (-T) or library function (-U) which when called by the traced ...