when exit from grub - uefi shell, then reenter uefi shell , got "Synchronous Exception:"

[Fu Wei]

uefi binary : linaro-edk2(http://snapshots.linaro.org/components/kernel/linaro-edk2/12)
grub binary: install by grub-install(in the laest leg image from, ci-loop ,https://snapshots.linaro.org/kernel-hwpack/linux-leg-vexpress64/latest, 22-Apr-2014 20:11)

The default boot selection will start in 9 seconds
[1] Linaro disk image on virtio
 - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/Image
 - Arguments: console=ttyAMA0 earlyprintk=pl011,0x1c090000 debug user_debug=31 loglevel=9 root=/dev/vda2
 - FDT: VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/fvp-base-gicv2-psci.dtb
 - LoaderType: Linux kernel with Local FDT
[2] pxe
 - MAC(201201041000,0x1)
 - LoaderType: EFI Application
-----------------------
Global FDT Config
 - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/fdt.dtb
-----------------------
[a] Boot Manager
[b] Shell
[c] Reboot
[d] Shutdown
Start: b

UEFI Interactive Shell v2.0
EDK II
UEFI v2.40 (ARM Fixed Virtual Platform EFI Apr 17 2014 09:42:35, 0x00000000)
Mapping table
      FS0: Alias(s):F8:
          VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)
      FS1: Alias(s):HD12b:;BLK5:
          VenHw(FE61BB5F-1B67-4C24-B346-73DB42E873E5)/HD(1,MBR,0x00000000,0x3F,0x21FC0)
     BLK3: Alias(s):
          VenHw(E7223039-5836-41E1-B542-D7EC736C5E59)
     BLK0: Alias(s):
          VenHw(02118005-9DA7-443A-92D5-781F022AEDBB)
     BLK1: Alias(s):
          VenHw(1F15DA3C-37FF-4070-B471-BB4AF12A724A)
     BLK2: Alias(s):
          VenHw(CC2CBF29-1498-4CDD-8171-F8B6B41D0909)
     BLK4: Alias(s):
          VenHw(FE61BB5F-1B67-4C24-B346-73DB42E873E5)
     BLK6: Alias(s):
          VenHw(FE61BB5F-1B67-4C24-B346-73DB42E873E5)/HD(2,MBR,0x00000000,0x22000,0x3DE000)

Press ESC in 4 seconds to skip startup.nsh or any other key to continue.
Shell> FS1:\EFI\grub\grubaa64.efi
Welcome to GRUB!

                          GNU GRUB version 2.02~beta2

   Minimal BASH-like line editing is supported. For the first word, TAB
   lists possible command completions. Anywhere else TAB lists possible
   device or file completions. ESC at any time exits.

grub> exit
Shell> exit
[1] Linaro disk image on virtio
 - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/Image
 - Arguments: console=ttyAMA0 earlyprintk=pl011,0x1c090000 debug user_debug=31 loglevel=9 root=/dev/vda2
 - FDT: VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/fvp-base-gicv2-psci.dtb
 - LoaderType: Linux kernel with Local FDT
[2] pxe
 - MAC(201201041000,0x1)
 - LoaderType: EFI Application
-----------------------
Global FDT Config
 - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/fdt.dtb
-----------------------
[a] Boot Manager
[b] Shell
[c] Reboot
[d] Shutdown
Start: b

Synchronous Exception:

Synchronous Exception:

(infinite Synchronous Exception: )

[Leif Lindholm (leif-lindholm)]

Not high impact, but clearly needs fixing.

[Fu Wei (fu-wei)]

 bug is still present, in http://snapshots.linaro.org/components/kernel/linaro-edk2/15/release

The default boot selection will start in 10 seconds
[1] Linaro disk image on virtio
 - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/Image
 - Arguments: console=ttyAMA0 earlyprintk=pl011,0x1c090000 debug user_debug=31 loglevel=9 root=/dev/vda2
 - FDT: VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/fvp-base-gicv2-psci.dtb
 - LoaderType: Linux kernel with Local FDT
[2] pxe
 - MAC(201201041000,0x1)
 - LoaderType: EFI Application
-----------------------
Global FDT Config
 - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/fdt.dtb
-----------------------
[a] Boot Manager
[b] Shell
[c] Reboot
[d] Shutdown
Start: b

UEFI Interactive Shell v2.0
EDK II
UEFI v2.40 (ARM Fixed Virtual Platform EFI May 1 2014 11:22:40, 0x00000000)
Mapping table
      FS0: Alias(s):F8:
          VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)
      FS1: Alias(s):HD12b:;BLK5:
          VenHw(FE61BB5F-1B67-4C24-B346-73DB42E873E5)/HD(1,MBR,0x00000000,0x3F,0x21FC0)
     BLK3: Alias(s):
          VenHw(E7223039-5836-41E1-B542-D7EC736C5E59)
     BLK0: Alias(s):
          VenHw(02118005-9DA7-443A-92D5-781F022AEDBB)
     BLK1: Alias(s):
          VenHw(1F15DA3C-37FF-4070-B471-BB4AF12A724A)
     BLK2: Alias(s):
          VenHw(CC2CBF29-1498-4CDD-8171-F8B6B41D0909)
     BLK4: Alias(s):
          VenHw(FE61BB5F-1B67-4C24-B346-73DB42E873E5)
     BLK6: Alias(s):
          VenHw(FE61BB5F-1B67-4C24-B346-73DB42E873E5)/HD(2,MBR,0x00000000,0x22000,0x3DE000)

Press ESC in 5 seconds to skip startup.nsh or any other key to continue.
Shell> FS1:\EFI\grub\grubaa64.efi
Welcome to GRUB!

                          GNU GRUB version 2.02~beta2

   Minimal BASH-like line editing is supported. For the first word, TAB
   lists possible command completions. Anywhere else TAB lists possible
   device or file completions. ESC at any time exits.

grub> exit
Shell> exit
[1] Linaro disk image on virtio
 - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/Image
 - Arguments: console=ttyAMA0 earlyprintk=pl011,0x1c090000 debug user_debug=31 loglevel=9 root=/dev/vda2
 - FDT: VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/fvp-base-gicv2-psci.dtb
 - LoaderType: Linux kernel with Local FDT
[2] pxe
 - MAC(201201041000,0x1)
 - LoaderType: EFI Application
-----------------------
Global FDT Config
 - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/fdt.dtb
-----------------------
[a] Boot Manager
[b] Shell
[c] Reboot
[d] Shutdown
Start: b

Synchronous Exception:

Synchronous Exception:

[Fu Wei (fu-wei)]

Just tested the http://snapshots.linaro.org/components/kernel/linaro-edk2/18/release/
I used "FS3:\EFI\grub\grubaa64.efi" to launch grub(installed by grub-install),then exited to uefi menu , then got into uefi shell again.
I have tested it several times, but didn't get any "Synchronous Exception:" error .

For now, I think this bug has been fixed.