kernel trap 12 with interrupts disabled

[Chris H]

On Sun, 05 Mar 2017 14:26:31 +0800 Alastair Hogge <agh at fastmail.fm> wrote

> On Sat, 4 Mar 2017 10:08:45 PM Chris H wrote:
> > Thanks for the reply.
> > I rebooted to kernel.old, so I could get the exact
> > src revision I built this on. It's r314640
> > 
> > Any news as to whether it's safe to update src, and
> > build a usable kernel?
> 
> I am not able to boot a kernel > r314627.  I currently have a r314627 kernel 
> running with a r314687 world.

Looking at the output in my trap; I got the impression that
the commit: r314636, might be to blame --

MCA: add AMD Error Thresholding support

Currently the feature is implemented only for a subset of errors
reported via Bank 4.  The subset includes only DRAM-related errors.

The new code builds upon and reuses the Intel CMC (Correctable MCE
Counters) support code.  However, the AMD feature is quite different
and, unfortunately, much less regular.

Just a guess, tho.

I'm thinking to back that commit out, and giving world/kernel
another shot.

--Chris

> 
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