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SubjectRe: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area
Eric W. Biederman wrote:
> Mike Travis <travis@sgi.com> writes:
>
>
>> Unfortunately it's back to the problem of faulting before x86_64_start_kernel()
>> and grub just immediately reboots. So I'm back at analyzing assembler and
>> config differences.
>>
>
> Ok. That is a narrow window of code. So it shouldn't be too bad, nasty though.
>
> If you would like to trace through it I have attached my serial port
> debugging routines that I use in that part of the code.

Last time it was doing this, it was a result of a triple-fault caused by
loading %ds with an all-zero gdt. I modified Xen to dump the CPU state
on triple-faults, so it was easy to pinpoint. I can do that again if it
helps.

J


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