查看kdump状态为failed。
重启kdump服务失败，原因未知。
安装crash：sudo yum install crash
运行测试：
[yubo.wang@localhost 4g-box]$ sudo crash a.out
[sudo] password for yubo.wang:
crash 7.2.3-8.el7
Copyright (C) 2002-2017 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.
WARNING: a.out and /proc/version do not match!
WARNING: /proc/version indicates kernel version: 3.10.0-514.2.2.el7.x86_64
crash: please use the vmlinux file for that kernel version, or try using
the System.map for that kernel version as an additional argument.
暂时放一放了