$sudo dd if=vmlinuz-3.2.0-23-generic-pae skip=`grep -a -b -o -m 1 -P '\x1f\x8b\x08\x00' vmlinuz-3.2.0-23-generic-pae| cut -d: -f 1` bs=1 | zcat > /tmp/vmlinux
    4998324+0 records in
    4998324+0 records out
    4998324 bytes (5.0 MB) copied,201.859 s,24.8 kB/s

    gzip: stdin: decompression OK,trailing garbage ignored

现在出错了

crash：/var/crash/_usr_sbin_ietd.0.crash：不支持的文件格式

我们还需要使用apport-unpack从崩溃报告中提取核心转储文件,如下所示(from here)

@ubuntu:/tmp$sudo apport-unpack 
Usage: /usr/bin/apport-unpack <report> <target directory>

@ubuntu:/tmp$sudo apport-unpack /var/crash/_usr_sbin_ietd.0.crash /var/crash/
ERROR: Destination directory exists and is not empty.
@ubuntu:/tmp$

@ubuntu:/tmp$sudo mkdir coretest

@ubuntu:/tmp$sudo apport-unpack /var/crash/_usr_sbin_ietd.0.crash /tmp/coretest/
@ubuntu:/tmp$cd coretest/
@ubuntu:/tmp/coretest$

@ubuntu:/tmp/coretest$ls
Architecture  Date           ExecutablePath       ProblemType  ProcCwd      ProcMaps    Signal  UserGroups
CoreDump      DistroRelease  ExecutableTimestamp  ProcCmdline  ProcEnviron  ProcStatus  Uname

@ubuntu:/tmp/coretest$ls -lt
total 384
-rw-r--r-- 1 root root      4 May 29 00:13 Architecture
-rw-r--r-- 1 root root     24 May 29 00:13 Date
-rw-r--r-- 1 root root     12 May 29 00:13 DistroRelease
-rw-r--r-- 1 root root     10 May 29 00:13 ExecutableTimestamp
-rw-r--r-- 1 root root 339968 May 29 00:13 CoreDump
-rw-r--r-- 1 root root      5 May 29 00:13 ProblemType
-rw-r--r-- 1 root root     66 May 29 00:13 ProcEnviron
-rw-r--r-- 1 root root    969 May 29 00:13 ProcMaps
-rw-r--r-- 1 root root    737 May 29 00:13 ProcStatus
-rw-r--r-- 1 root root      2 May 29 00:13 Signal
-rw-r--r-- 1 root root     31 May 29 00:13 Uname
-rw-r--r-- 1 root root     14 May 29 00:13 ExecutablePath
-rw-r--r-- 1 root root     14 May 29 00:13 ProcCmdline
-rw-r--r-- 1 root root      1 May 29 00:13 ProcCwd
-rw-r--r-- 1 root root      0 May 29 00:13 UserGroups
@ubuntu:/tmp/coretest$cd CoreDump
bash: cd: CoreDump: Not a directory
@ubuntu:/tmp/coretest$sudo crash /tmp/vmlinux /boot/System.map-3.2.0-23-generic-pae /tmp/coretest/CoreDump 

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) 2005,2011,2012  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.

GNU gdb (GDB) 7.3.1
Copyright (C) 2011 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 "i686-pc-linux-gnu"...

crash: /tmp/vmlinux: no debugging data available

@ubuntu:/tmp/coretest$

对于“No debugging data available”,需要安装一些根据this link和one安装的debuginfo软件包(programname-dbg或progname-dbgsym)

在问题https://askubuntu.com/questions/197016/how-to-install-a-package-that-contains-ubuntu-kernel-debug-symbols中提到了下载用于内核的debuginfo包的步骤

但是,添加GPG密钥(如下所示)的步骤对于下载工作至关重要

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ECDCAD72428D7C01

您应该收到消息

public key “Ubuntu Debug Symbol Archive Automatic Signing Key
” imported

而不是“未改变”的状态.如果在此步骤中显示“未更改”,则您将无法下载debuginfo包.

在这种情况下,尝试使用http 80端口导入GPG密钥为(here)

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10