CentOSでcrashコマンドを試してみる

CentOSでcrashコマンドでカーネルデバッグできる環境を構築する手順例を示す。

まず何も考えずcrashコマンドを叩いてみる。   

# crash

crash 4.0-5.0.3.el5.centos

Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008  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: cannot find booted kernel -- please enter namelist argument
Usage:

  crash [-h [opt]][-v][-s][-i file][-d num] [-S] [mapfile] [namelist] [dumpfile]
Enter "crash -h" for details.

#

なにもエラーが出なければ既に設定はされており、手順はここで終了。

上記の様にエラーがでるなら、http://debuginfo.centos.org/からkernel-debuginfoをダウンロードしてくる。

例では以下をダウンロードしたした。※現在動作中のカーネル版数と同じにすること。

 
• http://debuginfo.centos.org/5/i386/kernel-debuginfo-2.6.18-92.1.22.el5.i686.rpm

 

• http://debuginfo.centos.org/5/i386/kernel-debuginfo-common-2.6.18-92.1.1.el5.i686.rpm

インストールから動作確認まで、以下手順で行う。

# rpm -ihv kernel-debuginfo-common-2.6.18-92.1.1.el5.i686.rpm
# rpm -ihv kernel-debuginfo-2.6.18-92.1.22.el5.i686.rpm
# crash

crash 4.0-5.0.3.el5.centos

Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008  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 6.1

Copyright 2004 Free Software Foundation, Inc.

GDB 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.

Type "show copying" to see the conditions.

There is absolutely no warranty for GDB.  Type "show warranty" for details.

This GDB was configured as "i686-pc-linux-gnu"...
      KERNEL: /usr/lib/debug/lib/modules/2.6.18-92.1.22.el5/vmlinux

    DUMPFILE: /dev/crash

        CPUS: 1

        DATE: Thu Mar  5 12:22:00 2009

      UPTIME: 02:24:35

LOAD AVERAGE: 2.14, 0.97, 0.65

       TASKS: 159

    NODENAME: localhost.localdomain

     RELEASE: 2.6.18-92.1.22.el5

     VERSION: #1 SMP Tue Dec 16 12:03:43 EST 2008

     MACHINE: i686  (1728 Mhz)

      MEMORY: 256 MB

         PID: 7203

     COMMAND: "crash"

        TASK: c75ef550  [THREAD_INFO: c6d1a000]

         CPU: 0

       STATE: TASK_RUNNING (ACTIVE)
crash>

完了。