如何在Ubuntu 12.04上读取崩溃文件？

php5-fpm崩溃了，我们想获取有关当时执行的信息。我们无法从xdebug中获得它，因为它已经在生产中发生。

我将故障实例的驱动器安装到另一个实例（/ mnt）上，并尝试读取崩溃文件：

版本信息

root@dev:/mnt/var/crash# cat /mnt/etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.4 LTS"

尝试使用gdb ..打开崩溃文件，但是无法识别：

root@dev:/mnt/var/crash# gdb /mnt/usr/sbin/php5-fpm _usr_sbin_php5-fpm.1002.crash 
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
Copyright (C) 2012 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-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /mnt/usr/sbin/php5-fpm...(no debugging symbols found)...done.
"/mnt/var/crash/_usr_sbin_php5-fpm.1002.crash" is not a core dump: File format not recognized

然后尝试崩溃：

root@dev:/mnt/var/crash# crash _usr_sbin_php5-fpm.1002.crash 

crash 6.1.6
Copyright (C) 2002-2013  Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
Copyright (C) 1999-2006  Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011  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.

crash: _usr_sbin_php5-fpm.1002.crash: not a supported file format

该文件本身具有一些基本信息，但其内容似乎是base64编码的：

[...]
Signal: 11
Uname: Linux 3.2.0-59-virtual x86_64
UserGroups:
CoreDump: base64
 H4sICAAAAAAC/0NvcmVEdW1wAA==
[...]

关于如何阅读此书有任何想法吗？