Re: [Xen-devel] Xen 4.7.0 boot PANIC on kernel 4.7.0-4 + UEFI ?

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 03/08/16 14:57, Jan Beulich wrote:
>>>> On 03.08.16 at 15:33, <lists@xxxxxxxxxxxx> wrote:
>> On Wed, Aug 3, 2016, at 02:01 AM, Jan Beulich wrote:
>>> Thanks. Does the use of /mapbs really matter for booting? I was
>>> assuming it would be relevant only for shutdown/reboot?
>> It has no effect on boot. With or without the "/mapbs" it boots Xen OK.
> As expected.
>
>> Without the "/mapbs" the system used to crash on reboot, but still continued 
>> with a reboot.  Reboot with the "/mapbs" was OK.
>>
>> Now, even with the "/mapbs" the system crashes on reboot.
> But afaict in a different way:
>
>>      [  196.052042] reboot: Restarting system
>>      (XEN) [2016-08-03 13:06:54] Hardware Dom0 shutdown: rebooting machine
>>      (XEN) [2016-08-03 13:06:54] APIC error on CPU0: 40(00)
>>      (XEN) [2016-08-03 13:06:54] ----[ Xen-4.7.0_09-454  x86_64  debug=n  
>> Not tainted ]----
>>      (XEN) [2016-08-03 13:06:54] CPU:    0
>>      (XEN) [2016-08-03 13:06:54] RIP:    e008:[<000000009e746340>] 
>> 000000009e746340
>> [...]
>>      (XEN) [2016-08-03 13:30:44] ****************************************
>>      (XEN) [2016-08-03 13:30:44] Panic on CPU 0:
>>      (XEN) [2016-08-03 13:30:44] GENERAL PROTECTION FAULT
>>      (XEN) [2016-08-03 13:30:44] [error_code=0000]
>>      (XEN) [2016-08-03 13:30:44] ****************************************
> A #GP fault in firmware code. Not much we can do about, I'm afraid,
> except for having you go with one of the mentioned workarounds
> (and perhaps getting in touch with the BIOS vendor).

One bit you snipped was

(XEN) [2016-08-03 13:06:54] Xen code around <000000009e746340>
(000000009e746340):
(XEN) [2016-08-03 13:06:54]  00 00 00 00 00 00 00 00 <00> 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00
(XEN) [2016-08-03 13:06:54] Xen stack trace from rsp=ffff83008ce27dc0:

which shows that the EFI firmware has ended up in a block of zeroes. 
This clearly isn't conducive to its overall health.

~Andrew

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