copy of /proc/vmcore

copy of /proc/vmcore

[Yermandu Patapitafious]

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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

I miss some step?

-- 
yermandu

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Re: copy of /proc/vmcore

[WANG Cong]

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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