Bug#1062073: grub-efi-amd64: GRUB 2.12 fails to boot with X64 exception

[Morten Hein Tiljeset]

Package: grub-efi-amd64
Version: 2.12-1
Severity: important

Dear Maintainer,

Upgrading to GRUB 2.12 makes my system unbootable. It immediately breaks
with the following error before giving me a chance to see any menu or
get any better debug output.

!!!! X64 Exception Type - 0D(#GP - General Protection)  CPU Apic ID - 00000000 !!!!
ExceptionData - 0000000000000000
RIP  - 000000005FDE0E22, CS  - 0000000000000038, RFLAGS - 0000000000210202
RAX  - 0000000000000004, RCX - 0000000000000000, RDX - 0000000000000004
RBX  - 5043414600000000, RSP - 000000006FC56008, RBP - 000000006FC56050
RSI  - 000000004D0ABEFA, RDI - 5043414600000000
R8   - 0000000000000053, R9  - 0000000000000001, R10 - 000000000001C201
R11  - 000000006FC55B80, R12 - 000000000000001C, R13 - 00000000600651EC
R14  - 000000005FDE0E1B, R15 - 0000000060065000
DS   - 0000000000000030, ES  - 0000000000000030, FS  - 0000000000000030
GS   - 0000000000000030, SS  - 0000000000000030
CR0  - 0000000080000013, CR2 - 0000000000000000, CR3 - 000000006FAD6000
CR4  - 0000000000000668, CR8 - 0000000000000000
DR0  - 0000000000000000, DR1 - 0000000000000000, DR2 - 0000000000000000
DR3  - 0000000000000000, DR6 - 00000000FFFF0FF0, DR7 - 0000000000000400
GDTR - 00000000698AD500 0000000000000047, LDTR - 0000000000000000
IDTR - 0000000067949018 0000000000000FFF,   TR - 0000000000000000
FXSAVE_STATE - 000000006FC55C60
!!!! Find image (No PDB)  (ImageBase=000000005FDD8000, EntryPoint=000000005FDD9000) !!!!

This is consistent across several similar machines, so I suspect a
software regression rather than a hardware issue.

FWIW the EFI BIOS is 
American Megatrends 
Version 2.20.1276
Core Version 5.14

I realize that this is not a lot to go on, but I would appreciate any
hints on how to debug this issue.

Best,
Morten Hein Tiljeset