Ubuntu
kexec-tools package

kexec doesn't load non-elf multiboot images

Bug #1297316 reported by Scott Moser
14
This bug affects 3 people
Affects Status Importance Assigned to Milestone
kexec-tools (Ubuntu)
Confirmed
Medium
Unassigned

Bug Description

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].

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.

$ 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

--
[1] http://comments.gmane.org/gmane.linux.ubuntu.devel.discuss/14419

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: kexec-tools 1:2.0.4-1ubuntu1
ProcVersionSignature: User Name 3.13.0-8.27-generic 3.13.2
Uname: Linux 3.13.0-8-generic x86_64
ApportVersion: 2.13.2-0ubuntu2
Architecture: amd64
Date: Tue Mar 25 14:00:01 2014
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kexec-tools
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
Scott Moser (smoser) wrote :
Revision history for this message
Scott Moser (smoser) wrote :

For convenience, attaching an example 'core.img'
from a trusty system at /boot/grub/i386-pc/core.img

Revision history for this message
Scott Moser (smoser) wrote :

posted upstream at http://lists.infradead.org/pipermail/kexec/2014-March/011346.html

Revision history for this message
Tycho Andersen (tycho-s) wrote :

Just to update, it looks like this is failing because booting a non-elf multiboot image is not yet supported by kexec.

Scott Moser (smoser)
summary: - kexec doesn't load multiboot images
+ kexec doesn't load non-elf multiboot images
Scott Moser (smoser)
Changed in kexec-tools (Ubuntu):
status: New → Confirmed
importance: Undecided → Medium
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