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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5
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1answer
255 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 ...
3
votes
1answer
70 views

How to dump the dmesg AKA Kernel logs to a single .txt file from the kernel boot?

I am trying to understand the SATA Host-Device Communication and for that I have put a lot of debug messages in the kernel driver code. Now messages are in such a huge amount that I am not able to see ...
3
votes
1answer
81 views

Debugging info in linux kernel - how does it work?

I have found that I can compile linux kernel with some flags adding debugging support like CONFIG_DEBUG_INFO. These options while useful in debugging are also required by some utilities like SystemTap....
3
votes
1answer
1k 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
1answer
158 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 ├─apache2───14*[apache2]...
2
votes
1answer
142 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 '...
2
votes
1answer
516 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
1answer
266 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 ...
1
vote
1answer
2k 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 /var/run/...
1
vote
1answer
371 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
22 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 ...
0
votes
1answer
58 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 ...
0
votes
1answer
115 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 ...
0
votes
1answer
57 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. ...
4
votes
0answers
343 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 ...
3
votes
0answers
40 views

Significance of Linux kernel's default_console_loglevel

What is the significance of default_console_loglevel in Linux? Commonly I see it described as the default value of console_loglevel. However, what that means I haven't seen explained anywhere. ...
3
votes
0answers
192 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 ...
3
votes
0answers
196 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
0answers
20 views

separate debug-info files in FreeBSD

In GNU/Linux, there are debug-link and build-id sections in ELF files which shows separate debug-info files name or CRC32 [https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html]. There ...
2
votes
0answers
65 views

Network debugging: Sudden rise in packet loss and latency

My laptop sees a sudden rise in packet loss and latency (from 0.0%, 1ms to 70%, 2000ms). It remains even after resuming from suspend-to-ram. It remains after: sudo killall wpa_supplicant sudo ...
2
votes
0answers
277 views

Transfer file to pc from embedded linux device via serial communications

I'm working on an AT91SAM9G20. I'm connected to AT91SAM9G20 via the debug port using rs232 serial communications. It has Linux version 3.4.8 but does not appear to have any of the common file ...
2
votes
0answers
217 views

How can I monitor the interactions of an application with dbus?

I think the title says it all. I have a set of applications, I want to montior any and all interactions of the applications with dbus. The things I've played with don't seem to have a way of focusing ...
2
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0answers
276 views

What is the correct way to fix the configure error: “Requested 'libdrm_nouveau >= 2.4.33' but version of libdrm_nouveau is 0.6”?

This issue came up when trying to assist a user with the questions: What are the required build dependencies of mesa for Debian-based distros? and How do I backport Mesa on Debian Wheezy?. Mesa on ...
2
votes
0answers
822 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 ...
2
votes
0answers
65 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 ...
2
votes
0answers
246 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 ...
2
votes
0answers
1k 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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0answers
26 views

list of wpa_supplicant error messages

I'm trying to write a test to debug a network manager that utilises wpa_supplicant but I'm having a hard time finding a list of error messages that I can expect for CTRL-EVENT-SSID-TEMP-DISABLED ...
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0answers
136 views

How to enable kernel pstore?

I'm trying to enable the kernel persistent storage (pstore) in order to help debug a module which malfunctions and freezes my laptop on suspend, but I'm having difficulties doing so. My kernel (4.1.20)...
1
vote
0answers
42 views

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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vote
0answers
33 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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0answers
243 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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0answers
2k 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 ...
1
vote
0answers
168 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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vote
0answers
521 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 <linux/kernel.h&...
1
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0answers
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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vote
0answers
274 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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0answers
468 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 ...
0
votes
0answers
12 views

Debug CalDAVs sync failures with network sniffer, how to be display prettyprinted traffic in terminal

I need to debug some unsuccessful CalDAV synchronization requests. I have functioning clients, so I can compare working vs broken. The traffic is SSL-encrypted, but I have the key. I have root on a ...
0
votes
0answers
37 views

Process crashed on the first several times when launching

I use OpenWrt and build OpenWrt provided Python 2.7.9 as modules which are standalone .ipk files. I simply copy those ipk files to our MIPSel platform and install it to a mounted file system on eMMC. ...
0
votes
0answers
27 views

controlling wpa_supplicant using node.js

I would like to control wpa_supplicant using a node.js module. Most importantly I want to be able to detect connection failures so I can write a program that can act upon them. So far setting up a ...
0
votes
0answers
23 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 ...
0
votes
0answers
64 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 ...
0
votes
0answers
64 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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0answers
20 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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0answers
80 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
83 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 ...
0
votes
0answers
164 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 /lib64/...
0
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0answers
866 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 ...
0
votes
0answers
117 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 ...