kdump of ubuntu12.04 cannot create kdump file, thanks!

Caizhifeng bluewindow at h3c.com
Fri Jun 20 06:45:56 UTC 2014

         In order to test the ubuntu 12.04' kdump function, I do this follow operation step by step:
a)  sudo apt-get install linux-crashdump
b)  patch up : https://launchpadlibrarian.net/111207316/no-vmcoreinfo.patch
c)  open an ssh connection
c)  exec command "echo c > /proc/sysrq-trigger"

after these steps, the system do rebooted, but an error occur and hang on like this:
Begin: Running /script/init-bottom ... kdump: Missing /boot/vmcoreinfo-3.2.0-23-generic ..

BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) build-in shell (ash)
Enter 'help' for a list of build-in commands.


and no crash file created.

I search "vmcore" substring in " /usr/share/initramfs-tools/scripts/ " with no result, how to solve this problem?
Any information will be very much appreciated, Thanks for all.

log info:
root at ubuntu-0:~# uname -a
Linux ubuntu-0 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
root at ubuntu-0:~# service kdump  start
* Loading crashkernel; kexec -p "/boot/vmlinuz-3.2.0-23-generic" --initrd="/boot/initrd.img-3.2.0-23-generic" --append=" BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=38e89080-5301-4b1d-93cd-30b70b5a4788 ro kdump_needed"...                                                                                    setup_linux_vesafb: 800x600x24 @ fc000000 +160000
                                                                                                                                                      [ OK ]
root at ubuntu-0:~# ls -lt /boot
total 22792
drwxr-xr-x 3 root root    12288 Jun 17 03:47 grub
-rw-r--r-- 1 root root 14171735 Jun 17 02:39 initrd.img-3.2.0-23-generic
-rw-r--r-- 1 root root   140279 Apr 10  2012 config-3.2.0-23-generic
-rw------- 1 root root  4965840 Apr 10  2012 vmlinuz-3.2.0-23-generic
root at ubuntu-0:~#

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