bhyve failure

[Neel Natu]

Hi Julian,

On Fri, Nov 28, 2014 at 7:36 AM, Julian Elischer <julian at freebsd.org> wrote:
> On 11/28/14, 3:12 AM, Neel Natu wrote:
>>
>> Hi Julian,
>>
>> On Thu, Nov 27, 2014 at 7:02 AM, Julian Elischer <julian at freebsd.org>
>> wrote:
>>>
>>> I added WITNESS to a kernel I've been running and during boot I got this
>>> result:
>>>
>>> vm exit[0]
>>>          reason          VMX
>>>          rip             0xffffffff8078c1a7
>>>          inst_length     7
>>>          status          0
>>>          exit_reason     2
>>
>> That's a triple fault (from sys/amd64/vmm/intel/vmcs.h)
>>
>> #define EXIT_REASON_TRIPLE_FAULT        2
>>
>>
>>>          qualification   0x0000000000000000
>>>          inst_type               0
>>>          inst_error              0
>>> Abort trap (core dumped)
>>>
>>> anyone have a decoder ring?
>>>
>> A few questions to narrow this down:
>>
>> Did you add WITNESS to the guest kernel or the host kernel when this
>> happened?
>
> yes I added it to the guest kernel.. I suspect it ay be related to this,
> especially since there was a kernel module loaded that was not recompiled.
> I'm trying to ascertain now whether a withness kernel requires special
> handling for its modules.
>
>
>>
>> Is this readily reproducible?
>
> don't know yet.
>

Its interesting that the guest went all the way to a triple fault
instead of stopping at the double fault handler.

I'll be happy to track this down if there is a reliably repro case
(guest binaries would be sufficient).

best
Neel

>>
>> Can you share the host and guest revision numbers?
>
>
> guest is custom sources based on stable-10 on the same day as 10.0 was
> released.basically whatever svn revision# was on 10.0 but on the stable
> branch.
> host is
> FreeBSD 10.1-BETA1 #0 r271671: Tue Sep 16 09:31:23 PDT 2014
>
>
>
>
>>
>> best
>> Neel
>>
>>> julian
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>
>