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Operating Systems Linux Do you still googling error messages? Post 302811261 by wakatana on Thursday 23rd of May 2013 11:40:49 AM
Old 05-23-2013
Do you still googling error messages?

I am intermediate Linux user which has basic knowledge of programming (c, perl, js ...) and some system troubleshooting (strace, SystemTap, lsof ...) and I am tired of Googling the messages which comes to Linux logs (/var/log/messages). I would like to improve my Linux kernel knowledge. Since Linux (and it's utilities like ssh etc.) is open source there are source codes available somewhere. So my question is: How can I troubleshoot/debug Linux problems on source code level? Is this even possible for intermediate Linux user? Where to begin and how to improve my programming skills and Linux kernel knowledge this way? Any best practices are welcomed.

Something like this:

  1. Copy your error message
  2. Paste it to online search engine for kernel source codes which can be found *
  3. Now you have file name where it appears under kernel structures
  4. See folders and files structure contained in kernel here *
  5. You can deduce from file location what is purpose of this file under kernel, or find further documentation here *
  6. Use tool * to find further files in kernel on which your incriminated file depends
  7. Now read their source until it will be clear
  8. Now you can see under which conditions this message happens (if else statements)
  9. You can use software like * to debug or write some kind of exception to see when this message appears.

Thank you.
 

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CREATE_MODULE(2)					     Linux Programmer's Manual						  CREATE_MODULE(2)

NAME
create_module - create a loadable module entry SYNOPSIS
#include <linux/module.h> caddr_t create_module(const char *name, size_t size); DESCRIPTION
Note: This system call is present only in kernels before Linux 2.6. create_module() attempts to create a loadable module entry and reserve the kernel memory that will be needed to hold the module. This sys- tem call requires privilege. RETURN VALUE
On success, returns the kernel address at which the module will reside. On error -1 is returned and errno is set appropriately. ERRORS
EEXIST A module by that name already exists. EFAULT name is outside the program's accessible address space. EINVAL The requested size is too small even for the module header information. ENOMEM The kernel could not allocate a contiguous block of memory large enough for the module. ENOSYS create_module() is not supported in this version of the kernel (e.g., the kernel is version 2.6 or later). EPERM The caller was not privileged (did not have the CAP_SYS_MODULE capability). VERSIONS
This system call is only present on Linux up until kernel 2.4; it was removed in Linux 2.6. CONFORMING TO
create_module() is Linux-specific. SEE ALSO
delete_module(2), init_module(2), query_module(2) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2012-10-18 CREATE_MODULE(2)
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