Re: [LKP] [x86/pci] 7ffb31888c: PANIC:early_exception

[Pu Wen]

On 2018/9/20 8:26, Rong Chen wrote:
> On 09/19/2018 09:53 PM, Pu Wen wrote:
> > I cannot reproduce this panic on Hygon Dhyana platform. I tired lkp-tests
> > both in Ubuntu 16.04 (with gcc-5) and Ubuntu 18.04 (with gcc-7).
> > What kind of host do you use to run the qemu? A Intel one or AMD one?
> It's a Intel one,
>
> model: Nehalem-EX
> memory: 224G
> nr_node: 4
> nr_cpu: 64
> nr_socket: 4
> brand: Intel(R) Xeon(R) CPU X7560 @ 2.27GHz

I reproduced the PANIC by running lkp-tests with a Intel machine.

The reason is that the function early_is_amd_nb is called even if
running on Intel machine. At this case the misc_ids is NULL so the
PANIC occur.

I'll rework a patch to solve this problem, either restore the default
value of misc_ids with the original AMD one or not call early_is_amd_nb
on Intel platform.

--
Regards,
Pu Wen