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 FREEBSD

crashinfo

CRASHINFO(8)						    BSD System Manager's Manual 					      CRASHINFO(8)

NAME

     crashinfo -- analyze a core dump of the operating system

SYNOPSIS

     crashinfo [-d crashdir] [-n dumpnr] [-k kernel] [core]

DESCRIPTION

     The crashinfo utility analyzes a core dump saved by savecore(8).  It generates a text file containing the analysis in the same directory as
     the core dump.  For a given core dump file named vmcore.XX the generated text file will be named core.txt.XX.

     By default, crashinfo analyzes the most recent core dump in the core dump directory.  A specific core dump may be specified via either the
     core or dumpnr arguments.	Once crashinfo has located a core dump, it analyzes the core dump to determine the exact version of the kernel
     that generated the core.  It then looks for a matching kernel file under each of the subdirectories in /boot.  The location of the kernel
     file can also be explicitly provided via the kernel argument.

     Once crashinfo has located a core dump and kernel, it uses several utilities to analyze the core including dmesg(8), fstat(1), iostat(8),
     ipcs(1), kgdb(1), netstat(1), nfsstat(1), ps(1), pstat(8), and vmstat(8).

     The options are as follows:

     -d crashdir
	     Specify an alternate core dump directory.	The default crash dump directory is /var/crash.

     -n dumpnr
	     Use the core dump saved in vmcore.dumpnr instead of the latest core in the core dump directory.

     -k kernel
	     Specify an explicit kernel file.

SEE ALSO

     textdump(4), savecore(8)

HISTORY

     The crashinfo utility appeared in FreeBSD 6.4.

BSD
								   June 28, 2008							       BSD