使用-d number可以打印运行crash命令时，输出的调试信息。number越大，输出的信息越多。目前-d8可以打印所有的调试信息。举例如下：
# crash -d8
crash 7.0.2-6.el7
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.
find_booted_kernel: search for [Linux version 3.10.0-123.el7.x86_64.debug (mockbuild@x86-017.build.eng.bos.redhat.com) (gcc version 4.8.2 20
140120 (Red Hat 4.8.2-16) (GCC) ) #1 SMP Mon May 5 11:24:18 EDT 2014]
mount_points[0]: / (167c600)
mount_points[1]: /proc (167c620)
mount_points[2]: /sys (167c640)
mount_points[3]: /dev (167c660)
mount_points[4]: /sys/kernel/security (167c680)
mount_points[5]: /dev/shm (167c6b0)
mount_points[6]: /dev/pts (167c6d0)
mount_points[7]: /run (167c6f0)
mount_points[8]: /sys/fs/cgroup (167c710)
mount_points[9]: /sys/fs/cgroup/systemd (167c740)
mount_points[10]: /sys/fs/pstore (167c780)
mount_points[11]: /sys/fs/cgroup/cpuset (167c7b0)
mount_points[12]: /sys/fs/cgroup/cpu,cpuacct (167c7f0)
mount_points[13]: /sys/fs/cgroup/memory (167c830)
......