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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