[Bug 194641] New: [EFI] boot/loader.efi: miscompilation on Intel Haswell with AVX2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194641

            Bug ID: 194641
           Summary: [EFI] boot/loader.efi: miscompilation on Intel Haswell
                    with AVX2
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ohartman at zedat.fu-berlin.de

Compileing world on Intel Haswell with CPUTYPE?=native set in either
/etc/make.conf and/or /etc/src.conf renders /boot/loader.efi to fail: the EFI
boot process stops and freezes when loader.efi is loaded.

The problem affects only Haswell-based hardware (from my point of view, it
seems to be AVX2), since Sandy_bridge and Ivy-Bridge based systems do not show
the problem, even if world/kernel is compiled with -O3 and -march=native as I
have tested on several CURRENT systems with most recent CURRENT as of today
(FreeBSD 11.0-CURRENT #2 r273743: Mon Oct 27 19:51:01 CET 2014 amd64).

The problem has been discussed recently on the CURRENT mailing list, but no PR
has been issued so far.

Please look at 

http://freebsd.1045724.n5.nabble.com/CURRENT-EFI-boot-failure-td5949387.html

oh

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