[PATCH 0/5] Add second memory region for crash kernel

[Eric W. Biederman]

Cong Wang <amwang at redhat.com> writes:

> Eric W. Biederman wrote:
>> Vivek Goyal <vgoyal at redhat.com> writes:
>>
>>> Vitaly, have you really run into cases where 2G upper limit is a concern.
>>> What is the configuration you have, how much memory it has and how much
>>> memory are you planning to reserve for kdump kernel?
>>
>> A good question.
>>
>
> We have observed that on a machine which has 66G memory, when we do
> crashkernel=1G at 4G, kexec failed to load the crash kernel, but the memory
> reservation _did_ succeed.

Did you try loading vmlinux?   If not this sounds like the fact that
/sbin/kexec doesn't realize it can boot a 64bit bzImage in 64bit
mode.

Eric