How to do core dump analysis Post: 75404

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Top Forums UNIX for Advanced & Expert Users How to do core dump analysis Post 75404 by question on Friday 17th of June 2005 03:53:47 PM

06-17-2005

Registered User

Cannot get backtrace command work "bt", cannot access memory?

Hi,
I think I have similar question, please bear me to put here.
I recently created a testing program containing only one thread to generate core file to analyze, but I couldn't use gdb to print stack trace, It says "cannot access memory ...".
Why? did I miss any command?
I did the test both on Linux and Solaris, same result.

tc11:/home/canzh/test> gcc -g devide.c

tc11:/home/canzh/test> ./a.out
Segmentation fault (core dumped)

tc11:/home/canzh/test> gdb a.out core
GNU gdb 5.0rh-5 Red Hat Linux 7.1
Copyright 2001 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux"...
Core was generated by `./a.out'.
Program terminated with signal 11, Segmentation fault.
Cannot access memory at address 0x40016bec
#0 0x400a68d6 in ?? ()
(gdb) bt
#0 0x400a68d6 in ?? ()
Cannot access memory at address 0xbffff8a8
(gdb) where
#0 0x400a68d6 in ?? ()
Cannot access memory at address 0xbffff8a8
(gdb) quit
tc11:/home/canzh/test> uname -a
Linux tc11 2.4.2-2 #1 Sun Apr 8 20:41:30 EDT 2001 i686 unknown

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LEARN ABOUT DEBIAN

gcore

gcore(1)							     GNU Tools								  gcore(1)

NAME

       gcore - Generate a core file for a running process

SYNOPSIS

       gcore [-o filename] pid

DESCRIPTION

       gcore generates a core file for the process specified by its process ID, pid. By default, the core file is written to core.pid, in the cur-
       rent directory.

       -o filename
	      write core file to filename instead of core.pid

COPYING

       Copyright (C) 2003, 2005, 2007, 2008 Free Software Foundation, Inc.

       Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this  permission  notice  are
       preserved on all copies.

       Permission is granted to copy and distribute modified versions of  this manual under the conditions for verbatim copying, provided that the
       entire resulting derived work is distributed under the terms of a permission notice identical to this one.

       Permission is granted to copy and distribute translations of this manual into another language, under the  above  conditions  for  modified
       versions,  except  that	this  permission notice may be included in translations approved by the Free Software Foundation instead of in the
       original English.

SEE ALSO

       gdb(1), core(5)

gdb 6.8 							     May 2007								  gcore(1)