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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 75404 by question on Friday 17th of June 2005 03:53:47 PM
Old 06-17-2005
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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Devel::GDB::LowLevel(3pm)				User Contributed Perl Documentation				 Devel::GDB::LowLevel(3pm)

NAME
Devel::GDB::LowLevel - Low-level interface for communicating with GDB DESCRIPTION
This module is used internally by Devel::GDB. It handles the low-level I/O of communicating with the GDB process. CONSTRUCTOR
new Spawns a GDB process. Because this class only facilitates communication with GDB (not with the inferior process being debugged), you have to decide what to do with the "STDIN", "STDOUT", and "STDERR" of that process. There are a few options available: * If STDIN is a tty, we can have the inferior process communicate directly with the controlling tty (emulating the default behavior of gdb): $gdb = new Devel::GDB::LowLevel( '-execfile' => $path_to_gdb, '-params' => $extra_gdb_params ); * Or, we can create an "Expect" object to communicate with the inferior process: $gdb = new Devel::GDB::LowLevel( '-create-expect' => 1 ); $expect = $gdb->get_expect_obj(); * Or, we can create our own tty and use that: $gdb = new Devel::GDB::LowLevel( '-use-tty' => '/dev/pts/123' ); METHODS
send Sends a raw line of text to GDB. This should not contain any newlines (they will be stripped). This method only sends a request, and does not wait for a response. get_reader Returns the file handle from which to read GDB responses. get_expect_obj Returns the "Expect" object created in the constructor. Dies if '-create-expect' was not passed to "new". interrupt Send SIGINT to the GDB session, interrupting the inferior process (if any). SEE ALSO
IPC::Open2 AUTHORS
Antal Novak <afn@cpan.org>, Josef Ezra <jezra@cpan.org> COPYRIGHT AND LICENSE
Copyright (C) 2007 by Antal Novak & Josef Ezra This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available. perl v5.8.8 2008-02-03 Devel::GDB::LowLevel(3pm)
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