常见问题本节列出了使用 crash 过程中可能会碰到的问题，并给出了相应的解决对策。
1. 缺少调试信息包
清单 12. 缺少调试信息包1
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| [root@bondlp1 2012-02-02-01:37]# crash
crash 5.1.8-1.el5
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.
crash: /boot/vmlinuz-2.6.18-307.el5: no debugging data available
crash: vmlinuz-2.6.18-307.el5.debug: debuginfo file not found
crash: either install the appropriate kernel debuginfo package, or
copy vmlinuz-2.6.18-307.el5.debug to this machine
|
遇到这种问题时，需要安装内核调试信息包，再重新运行 crash 命令。
2. vmlinux 和 vmcore 版本不匹配
清单 13. vmlinux 和 vmcore 版本不匹配1
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| [root@bondlp1 2012-02-02-01:37]# crash /usr/lib/debug/lib/modules/2.6.18-305.el5/vmlinux vmcore
crash 5.1.8-1.el5
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 "powerpc64-unknown-linux-gnu"...
WARNING: kernel version inconsistency between vmlinux and dumpfile
please wait... (gathering module symbol data)
WARNING: cannot access vmalloc'd module memory
crash: invalid kernel virtual address: 8000000000b663c8 type: "runqueues entry (per_cpu)"
|
这种情况说明你所使用的 vmlinux 与产生 vmcore 的内核版本不一致，需要使用相同版本的内核来调试 vmcore 文件。
3. core 文件不完整
清单 14. core 文件不完整1
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| [root@bondlp1 2012-02-02-01:37]# crash /usr/lib/debug/lib/modules/2.6.18-305.el5/vmlinux vmcore
crash 5.1.8-1.el5
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.
WARNING: vmcore: may be truncated or incomplete
PT_LOAD p_offset: 1610681124
p_filesz: 234881024
bytes required: 1845562148
dumpfile size: 1638400000
|
这个提示说明你使用的 vmcore 文件不完整。导致这个问题的原因可能有多种，硬盘空间不足，网络 dump 时网络中断等等。对于这种情况，我们需要重新 dump 一个完整的 vmcore 进行分析调试。 |
