cannot seem to load multiboot images

[Scott Moser]

kexec explictly (in --help and man page) reports to support multiboot
format images. That doesn't work for at least some subset of seemingly
proper multiboot images. For some context, the goal essentially the same
as discussed at [1].

Has anyone seen this work?  I've just checked with git at current tip
(401e037e5e9527134c594b8923342a69ff38b7cb) and see the same problem.

mbchk is from 'multiboot' package (built from source).

Also note that 'qemu-system-x86_64' loads this multiboot image properly
with 'qemu-system-x86_64 -kernel'

$ dpkg-query --show kexec-tools
kexec-tools 1:2.0.4-1ubuntu1

$ mbchk /boot/grub/i386-pc/core.img
/boot/grub/i386-pc/core.img: The Multiboot header is found at the offset
2416.
/boot/grub/i386-pc/core.img: Page alignment is turned off.
/boot/grub/i386-pc/core.img: Memory information is turned off.
/boot/grub/i386-pc/core.img: Address fields is turned on.
/boot/grub/i386-pc/core.img: All checks passed.

$ sudo ./build.out/sbin/kexec --debug --type multiboot-x86
/boot/grub/i386-pc/core.img
kernel: 0xe19010 kernel_size: 0x6315
MEMORY RANGES
0000000000000100-000000000009f000 (0)
000000000009f000-00000000000a0000 (1)
00000000000e7000-0000000000100000 (1)
0000000000100000-00000000bf760000 (0)
00000000bf76e000-00000000bf770000 (1)
00000000bf770000-00000000bf77e000 (2)
00000000bf77e000-00000000bf7d0000 (3)
00000000bf7d0000-00000000bf7e0000 (1)
00000000bf7ec000-00000000c0000000 (1)
00000000e0000000-00000000f0000000 (1)
00000000fee00000-00000000fee01000 (1)
00000000ffc00000-0000000100000000 (1)
0000000100000000-0000000c40000000 (0)
Cannot determine the file type of /boot/grub/i386-pc/core.img


$ kexec --debug --type multiboot-x86 /boot/grub/i386-pc/core.img
kernel: 0x1767010 kernel_size: 6315
MEMORY RANGES
0000000000000100-000000000009f000 (0)
000000000009f000-00000000000a0000 (1)
00000000000e7000-0000000000100000 (1)
0000000000100000-00000000bf760000 (0)
00000000bf76e000-00000000bf770000 (1)
00000000bf770000-00000000bf77e000 (2)
00000000bf77e000-00000000bf7d0000 (3)
00000000bf7d0000-00000000bf7e0000 (1)
00000000bf7ec000-00000000c0000000 (1)
00000000e0000000-00000000f0000000 (1)
00000000fee00000-00000000fee01000 (1)
00000000ffc00000-0000000100000000 (1)
0000000100000000-0000000c40000000 (0)
Cannot determine the file type of /boot/grub/i386-pc/core.img


Note, I also
  I filed an ubuntu bug at http://pad.lv/1297316 .

https://bugs.launchpad.net/ubuntu/+source/kexec-tools/+bug/1297316