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Questions tagged [debug]

Debugging is a methodical process of finding and reducing the number of bugs, or defects, in a computer program

it involves numerous aspects, including: interactive debugging, control flow, integration testing, log files, monitoring (application, system), memory dumps, profiling, Statistical Process Control, and special design tactics to improve detection while simplifying changes.

127 questions
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after upgrade gdb won't attach to process

I just recently upgraded from 10.04 to 11.04 and gdb won't allow me to attach to processes anymore I get the error Attaching to process 10144 Could not attach to process. If your uid matches the uid of the target process, check the setting…
Andrew Redd
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45
votes
7 answers

How can I diagnose/debug "maximum number of clients reached" X errors?

I'm hitting a problem whereby X prevents processes from creating windows, uttering something like the following into ~/.xsession-errors: cannot open display: :0.0 Maximum number of clients reached Searching around there are lots of examples of…
jmtd
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41
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3 answers

How do I make cron email my @gmail account

I have a couple of cron jobs that sometimes produce error output and would like to get a notification in my "real" email account, since I don't use my user's mailbox in my Ubuntu laptop, but cron (or is it postfix maybe) keeps trying to email the…
Ricardo Reyes
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31
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4 answers

bash: set -x logs to file

I have a shell script with set -x to have verbose/debug output: #!/bin/bash set -x command1 command2 ... The output looks like this: + command1 whatever output from command1 + command2 whatever output from command2 My problem is, the shell output…
redseven
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How do I debug when the system freezes or when it crashes back to login?

I am fairly new to Ubuntu and I was wonder what a good way is to debug when something crashes? For example: I installed 11.04 and the default media player banshee makes my laptop crash after a few minutes of playing music. Since the system…
Pickels
  • 505
16
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3 answers

Debugging: Console Output and Upstart Scripts

How do you send the output of an upstart script to a terminal so to find tracebacks in python code? It's taking me for ever to do things without trace-backs that used to take just a second. I'm having to place several file write calls to track…
bambuntu
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15
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1 answer

How can I debug my wireless problem?

How can I get started with debugging my wireless problem? How can I tell whether or not Linux has recognized my wireless hardware at all? What are the main programs/daemons associated with wireless connectivity? Where are the log files for those…
fouric
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13
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6 answers

Debug Qt application on ubuntu with root permission using qt creator

It is possible to run my application with root priviliges using sudo, like this: sudo ./MyApp Is it possible to debug my Qt application using root priviliges using QtCreator? How can I do this on an Ubuntu system?
Arun Kumar K S
  • 279
9
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2 answers

How to use Moonlight to play videos on rtlmost.hu?

In Hungary, the biggest TV channel is RTL Klub, they has a video archive site. They use Silverlight instead of Flash :( What is annoying, they use the lastest version of Silverlight, about 4.x. But Moonlight doesn't support it yet. I've been tried…
antivirtel
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9
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3 answers

How do I get the bash debugger to work with ddd?

ddd script.bsh does not open the script. It shows an our glass and if I want to close ddd, it says "bash is busy"... I found an old message, but it didn't help. https://lists.gnu.org/archive/html/ddd/2008-10/msg00006.html I couldn't find…
James Mitch
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8
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1 answer

What are -dbg packages for?

1- What are -dbg packages really for? 2- Is it a good/bad idea to install them for, at least, my preferred applications/packages? 3- Does installing them for my preferred applications/packages helps developers on debugging bugs I may encounter?
malhobayyeb
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8
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3 answers

Accessing a specific URL with firefox 3.6 on Ubuntu 10.4 crashed the OS, how should I debug this?

The system is a spare Dell 2400 I wiped clean, with Ubuntu 10.4 installed. Update manager has everything current, and I haven't been mucking with drivers or tricky system settings. In fact, it has been a stable and friendly system to install and…
RBerteig
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6
votes
3 answers

How can I find out what is causing my gnome-panel to freeze?

About once a day my gnome-panel freezes. How can I produce some sort of debug information to: Figure out what is causing the freeze or File a bug or see if its an existing bug When gdb is attached to gnome-panel and the bug occurs I cannot get a…
Niall Murphy
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6
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1 answer

Debugging php with gdb

I am attempting to debug a SIGSEGV on PHP on my Ubuntu 9.10. I've installed php5-dbg to have the debug symbols available, however, when I start gdb, it shows the following output: Reading symbols from /usr/bin/php... Reading symbols from…
Johnco
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6
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1 answer

Missing fonts cause LibreOffice Impress to mess up the layout of the slides

I have reported a LibreOffice Impress bug here. In that bug, the text of a slide went beyond the page margin Although it looked fine in Microsoft PowerPoint Now I cannot reproduce the bug anymore. LibreOffice Impress, the same version used to…
robertspierre
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