Getting the kexec on panic

[Dave Young]

On 09/07/2012 06:06 AM, Jerry Snitselaar wrote:

> On Thu Sep 06 12, Lluís Batlle i Rossell wrote:
>> Hello,
>>
>> while I can load immediately a kernel using kexec, when I set it for panic and
>> crash with sysrq-c, the computer hangs.
>>
>> I'm using the nvidia X driver; can it be that it stops the panic handling from
>> working? I don't understand why it would work with normal kexec though, if it
>> were the case.
>>
>> Regards,
>> Lluís.
> 
> Hi Lluis,
> 
> 
> What kernel are you using? The commit 722bc6b "x86/mm: Fix the size calculation of mapping tables" which started showing up in 3.5-rc1 causes problems for the crash kernel. You might try this patchset[1] from Jacob Shin and see if it resolves the problem for you if you are experiencing your problem on a 3.5-rc1+ kernel.
> 
> [1] https://lkml.org/lkml/2012/8/24/474


He has updated the v5 patch set as below:
https://lkml.org/lkml/2012/8/29/227

> 
> Regards,
> Jerry
> 
>>
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-- 
Thanks
Dave