Hi Andriy,

On Tue, Jul 14, 2015 at 6:55 AM, Andriy Gapon <a...@freebsd.org> wrote:
> On 23/06/2015 11:05, Andriy Gapon wrote:
>> On 23/06/2015 10:26, Neel Natu wrote:
> [snip]
>>> Does this ever happen with a single vcpu guest?
>> Never seen the problem with a single CPU so far.
>> Also, never had that problem with FreeBSD guests.
>>> The other mystery is the NMIs the host is receiving. I (re)verified to
>>> make sure that bhyve/vmm.ko do not assert NMIs so it has to be
>>> something else on the host that's doing it ...
>> But the correlation with the multi-CPU non-FreeBSD guests seems to be 
>> significant.
> Today I've got another NMI with a Linux guest, but a few things were 
> different:
> - the host was fresh after a reboot
> - the guest was single CPU
> - the NMI happened during boot up of the very first VM
> kernel: NMI ISA 2c, EISA ff
> kernel: NMI ... going to debugger
> Not what causes those NMIs but when they happen they always happen during a
> bhyve guest boot...

Could you update the host with the following patch?

It enables KTR_GEN logging by default and turns it off when a VM-exit
due to NMI is detected. If there is a pattern to the NMIs then it can
be correlated with the guest activity around that time.


> --
> Andriy Gapon
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