[Bug 230511] Kernel panic on Xeon gold 6144

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230511

            Bug ID: 230511
           Summary: Kernel panic on Xeon gold 6144
           Product: Base System
           Version: 11.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: energyrikard at gmail.com

Created attachment 196064
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=196064&action=edit
Screendump showing the kernel panic.

Dear esteemed FreeBSD developers, 

I am in a little desperate situation... :) 
The developers of iXsystems behind FreeNAS are running the latest FreeBSD. They
told me to post here as this is 100% FreeBSD related. 
When I'm booting up the system, I get a kernel panic around 50% of the time.
I'm running the latest firmware and bios on the IPMI BMC, Supermicro
motherboard, Avago/LSI SAS3 HBA and the Chelsio NIC. 
>From the log-files it seems the CPU and the FreeBSD kernel don't like each
other.

I have tried to enable debug mode in the OS, but the panic happens before
anything useful is logged. I submitted the log to the FreeNAS developers and
they said they couldn't find anything useful in that log as the panic happened
too early. 

If you take a look at the attached JPEG, perhaps you can spot something? Their
recommendation was to  disable the Machine Check Architecture support by
setting loader tunable hw.mca.enabled=0.
I haven't done this yet. Shall I do it? 
The CPU is 8 cores with 16 threads each.

Is there anything that I can do to assist you to remedy the issue? 

Kind Regards, 
Rikard

P.S. 
I could of course install the latest stable FreeBSD version on a disk but i
find it meaningless as the FreeNAS kernel is the same as the FreeBSD. The
panics all appear on FreeNAS 11.1-U4, 11.1-U5, 11.2-latest beta

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