Gdb error while debugging core file Post: 302891662

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Operating Systems Linux Red Hat Gdb error while debugging core file Post 302891662 by sanzee007 on Friday 7th of March 2014 05:54:40 AM

03-07-2014

Registered User

Gdb error while debugging core file

Hi,
I am trying to analyze one core file on my RHEL 6.5, but I am getting below error related to the core file. So I am not getting any stack trace about the crash.

Code:

#  gdb MyDebugBin /var/core/MyDebugBin.27005
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from MyDebugBin...done.
BFD: Warning: MyDebugBin.27005 is truncated: expected core file size >= 47775744, found: 2387968.
[New Thread 27005]
Cannot access memory at address 0x4baca8e8
Cannot access memory at address 0x4baca8e8
Cannot access memory at address 0x4baca8e8
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
Failed to read a valid object file image from memory.
Core was generated by `/path_to_my_debug_bin/MyDebugBin :12 -auth /var/run/gdm/auth-for-gdm-kUgSIC/database'.
Program terminated with signal 11, Segmentation fault.
#0  0x4bb48506 in ?? ()
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.132.el6.i686
(gdb) bt
#0  0x4bb48506 in ?? ()
Cannot access memory at address 0xffe51198
(gdb) quit

Why gdb is complaining about the core size? There is enough space left for core files with ulimit unlimited set for core file.

How to fix this kind of error or problem related to gdb? Is it a known bug in gdb on higher version of linux kernel?

thanks,

sanzee007

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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)