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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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