Ryzen issues on FreeBSD ? (with sort of workaround)

[Konstantin Belousov]

On Fri, Jul 27, 2018 at 12:01:09PM +0100, Pete French wrote:
> So, I have been running the patched kernel for quiet a while now, and it 
> works fine for me, but last night I did hit a surprising issue - the 
> Linux emulator does not work on Ryzen / Epyc. I tried this on two 
> machines (both with the patches) and it coredumps when simply running 
> bash on both of them. I copied the OS over to an Intel machine, and that 
> works fine.
> 
> I have not tried running with an unpatched kernel on the Ryzen machine 
> (I dont have one to hand) but I did try applying the sysctls to the 
> Intel box to see if that wuld cause the Linux binaries to crash. It didn't.

I highly doubt that this can be related.

BTW, I forgot about the patch.  If nothing happens, I will commit it
today.