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From: WANG Cong <xiyou.wangcong@gmail.com>
Subject: Re: copy of /proc/vmcore
Date: Tue, 14 Jun 2011 08:07:47 +0000 (UTC)
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On Thu, 02 Jun 2011 18:34:29 -0300, Yermandu Patapitafious wrote:

> Hello,
> 
> The /proc/vmcore is not present before or after the crash
> 
> I load the kernel from grub pass parameter: crashkernel=256M mem=2048M
> bootmem_debug
> and then kexec -p bzImage --append="root=/dev/sda5 maxcpus=1 irqpool
> reset_devices"
> so i send request : echo c > /proc/sysrq-trigger
> 
> ok the kernel broken is loaded
> 
> Now i have a question:
> The system is stopped and i receive the message: Switching back to
> console
> 
> I assume that i need force reboot in this point, because system is
> freezed.
> 
> i dont see the /proc/vmcore , /dev/oldmem contains few datas

Do you have CONFIG_PROC_VMCORE=y in your kernel config?

And after you enable it, did you see "elfcorehdr=X" is passed to your 
second kernel?


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