----- Original Message ----- > [root@kvm7 127.0.0.1-2014-02-07-19:17:09]# crash /boot/System.map-2.6.32-220.el6.x86_64.debug /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64.debug/vmlinux vmcore > > crash 5.1.8-1.el6 > Copyright (C) 2002-2011 Red Hat, Inc. > Copyright (C) 2004, 2005, 2006 IBM Corporation > Copyright (C) 1999-2006 Hewlett-Packard Co > Copyright (C) 2005, 2006 Fujitsu Limited > Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. > Copyright (C) 2005 NEC Corporation > Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. > Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. > This program 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. Enter "help copying" to see the conditions. > This program has absolutely no warranty. Enter "help warranty" for details. > GNU gdb (GDB) 7.0 > Copyright (C) 2009 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-unknown-linux-gnu"... > > crash: page excluded: kernel virtual address: ffffffff81542000 type: "cpu_possible_mask" > > I can go into minimal, > > > nm -Bn /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64.debug/vmlinux | grep _stext > ffffffff81000198 T _stext > > cat /proc/kallsyms | grep _stext > ffffffff81000198 T _stext > > If I use the System Map parm I get this warning > > WARNING: kernels compiled by different gcc versions: > /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64.debug/vmlinux: 4.4.5 > vmcore kernel: 4.4.6 > > > Would really like to understand why this system crashed. I know I'm a bit > behind on my kernel versions however, but I should be able to look at this > kernel?? > > Thanks > Tory It looks like the vmcore and vmlinux file don't match, like maybe the crashing system was running the standard 2.6.32-220.el6.x86_64 kernel, and you're trying to debug it using the 2.6.32-220.el6.x86_64.debug kernel variant? First thing -- *never* use a System.map file unless for some reason you don't have the original kernel's vmlinux available *and* you feel that the vmlinux file you have is very close to the crashing kernel's vmlinux. Bit with any RHEL standard (unmodified) vmlinux/vmcore setup, the System.map is completely useless. So the first question is: what kernel generated the vmcore? Do this: $ strings vmcore | grep '2.6.32' Dave -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility
