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Full Discussion: How to do core dump analysis
Top Forums UNIX for Advanced & Expert Users How to do core dump analysis Post 73567 by jim mcnamara on Thursday 2nd of June 2005 04:05:01 PM
Old 06-02-2005
You're asking a lot.

Basically, you use a debugger. Since you did not specify an OS I'll assume you have
gdb. You must have compiled the file
Code:
gcc -g -o myfile myfile.c

in order for symbols to be available. If you are analyzing a core dump of somebody else's code you are in trouble.

The core dump file is called core
Code:
gdb myfile core

This will show you a backtrace (stack dump) of the call tree that lead to the crash.
You will have to find using the stack dump where in the code (not in a C library) the crash occurred. In other words the last line of the program's code that actually led to the crash.

try man gdb
and
this tutorial site for gdb:

http://www.unknownroad.com/rtfm/gdbtut/gdbuse.html
 

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GCORE(1)						       GNU Development Tools							  GCORE(1)

NAME
gcore - Generate a core file of a running program SYNOPSIS
gcore [-o filename] pid DESCRIPTION
Generate a core dump of a running program with process ID pid. Produced file is equivalent to a kernel produced core file as if the process crashed (and if "ulimit -c" were used to set up an appropriate core dump limit). Unlike after a crash, after gcore the program remains running without any change. OPTIONS
-o filename The optional argument filename specifies the file name where to put the core dump. If not specified, the file name defaults to core.pid, where pid is the running program process ID. SEE ALSO
The full documentation for GDB is maintained as a Texinfo manual. If the "info" and "gdb" programs and GDB's Texinfo documentation are properly installed at your site, the command info gdb should give you access to the complete manual. Using GDB: A Guide to the GNU Source-Level Debugger, Richard M. Stallman and Roland H. Pesch, July 1991. COPYRIGHT
Copyright (c) 1988-2013 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being "Free Software" and "Free Software Needs Free Documentation", with the Front-Cover Texts being "A GNU Manual," and with the Back-Cover Texts as in (a) below. (a) The FSF's Back-Cover Text is: "You are free to copy and modify this GNU Manual. Buying copies from GNU Press supports the FSF in developing GNU and promoting software freedom." gdb-Red Hat Enterprise Linux 7.6.1-51.el7 2014-06-10 GCORE(1)
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