Pkg xen devel - Aug 2008 - Bug#493856: xen-utils-3.2-1: i386 Dom0 cannot load Debian 2.6.26 amd64 kernel bzImage

Package: xen-utils-3.2-1
Version: 3.2.1-2
Severity: important

  Hi,

  I set the severity to important as it seems that current xen tools
does not allow to load amd64 Debian kernel in DomU.
  I also put the debian-kernel ML in CC as I'm not sure the problem
comes from xen tools or the kernel itself.


  Here is my configuration:
Hypervisor:
  xen-hypervisor-3.2-1-amd64 3.2.1-2 (arch-forced-installed in Dom0)
Dom0:
  current lenny i386
  kernel: custom 2.6.18.8-xen from upstream (Xen) sources
DomU:
  i386, kernel from linux-image-2.6.26-1-xen-686
  => works (using ELF-generic loader)

  i386, kernel from linux-image-2.6.26-1-686-bigmem
  => works (using Linux bzImage loader)

  amd64, kernel from linux-image-2.6.18-5-xen-amd64
  => works (using ELF-generic loader)

  amd64, kernel from linux-image-2.6.26-1-amd64
  => does not work (trying to use Linux bzImage loader)

For the last one, I have in /var/log/xen/domain-builder-ng.log:
xc_dom_allocate: cmdline="root=LABEL=atsina:ROOTFS ro console=hvc0",
features=""
xc_dom_kernel_file: filename="/boot/atsina/vmlinuz-2.6.26-1-amd64"
xc_dom_malloc_filemap    : 1703 kB
xc_dom_ramdisk_file: filename="/boot/atsina/initrd.img-2.6.26-1-amd64"
xc_dom_malloc_filemap    : 6101 kB
xc_dom_boot_xen_init: ver 3.2, caps xen-3.0-x86_64 xen-3.0-x86_32p 
xc_dom_parse_image: called
xc_dom_find_loader: trying ELF-generic loader ... failed
xc_dom_find_loader: trying Linux bzImage loader ... xc_dom_malloc
: 8035 kB
xc_dom_do_gunzip: unzip ok, 0x1a409f -> 0x7d8d00
OK
elf_parse_binary: phdr: paddr=0x200000 memsz=0x2f4000
elf_parse_binary: phdr: paddr=0x4f4000 memsz=0x786e8
elf_parse_binary: phdr: paddr=0x56d000 memsz=0x888
elf_parse_binary: phdr: paddr=0x56e000 memsz=0x100218
elf_parse_binary: memory: 0x200000 -> 0x66e218
elf_xen_note_check: ERROR: Will only load images built for the generic
loader or Linux imagesxc_dom_release: called


Then I patched the error message, changing in file
xen/common/libelf/libelf-dominfo.c the message to:
        elf_err(elf, "%s: ERROR: Will only load images built for the
generic "
                "loader or Linux images, not %s (%p), %s (%p).",
__FUNCTION__,
                parms->loader, parms->loader, parms->guest_os,
parms->guest_os);
I rebuild the packages and reinstalled the new xen-utils-3.2-1
After restarting xend, the last line in the log becomes:
elf_xen_note_check: ERROR: Will only load images built for the generic loader or
Linux images, not  (0x84ba144),  (0x84ba114).xc_dom_release: called


So, it seems that current i386 xen-utils-3.2-1 is unable to extract ELF
info from Debian linux kernel amd64 and refuse to boot such kernels in
DomU.
A quick workaround is to use the vmlinux file but this would need to
rebuild a new kernel. The kernel team does not create any xen-amd64
flavor anymore (probably because standard images should be loaded with
the ELF info)

Note: I'm not sure the bug does not come from the linux-image: perhaps
ELF info are not present in the linux-image-2.6.26-1-amd64 package.
Do you know a way to check that ?
If it were the case, this bug should be reassigned to the kernel.


  Best regards
    Vincent


Note: information below does not refer to the xen machine at all.

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500,
'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500,
'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500,
'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Your message dated Tue, 5 Aug 2008 14:33:11 +0200
with message-id <20080805123311.GA15625 at wavehammer.waldi.eu.org>
and subject line Re: [Pkg-xen-devel] Bug#493856: xen-utils-3.2-1: i386 Dom0
cannot load Debian 2.6.26 amd64 kernel bzImage
has caused the Debian Bug report #493856,
regarding xen-utils-3.2-1: i386 Dom0 cannot load Debian 2.6.26 amd64 kernel
bzImage
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
493856: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=493856
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
-------------- next part --------------
An embedded message was scrubbed...
From: Vincent Danjean <vdanjean at debian.org>
Subject: xen-utils-3.2-1: i386 Dom0 cannot load Debian 2.6.26 amd64 kernel
bzImage
Date: Tue, 05 Aug 2008 13:50:55 +0200
Size: 6260
Url:
http://lists.alioth.debian.org/pipermail/pkg-xen-devel/attachments/20080805/620b5d57/attachment.eml
-------------- next part --------------
An embedded message was scrubbed...
From: Bastian Blank <waldi at debian.org>
Subject: Re: [Pkg-xen-devel] Bug#493856: xen-utils-3.2-1: i386 Dom0 cannot
	load Debian 2.6.26 amd64 kernel bzImage
Date: Tue, 5 Aug 2008 14:33:11 +0200
Size: 1678
Url:
http://lists.alioth.debian.org/pipermail/pkg-xen-devel/attachments/20080805/620b5d57/attachment-0001.eml

> #493856: xen-utils-3.2-1: i386 Dom0 cannot load Debian 2.6.26 amd64 kernel
bzImage
> It has been closed by Bastian Blank <waldi at debian.org>.
> ------------------------------------------------------------------------
> 
> On Tue, Aug 05, 2008 at 01:50:55PM +0200, Vincent Danjean wrote:
>>   I set the severity to important as it seems that current xen tools
>> does not allow to load amd64 Debian kernel in DomU.
> 
> Please show that this kernels ships Xen support. (Hint: 2.6.26 don't
> even support x86_64 on Xen.) Until that this is no bug.
Thanks for your hint. I wrongly remember that Debian 2.6.26 backported
save/restore/migration and amd64 DomU support from 2.6.27.
Re-reading Ian and Maximilian mails, it is right for save/restore/migration
but not for amd64 DomU.

I will try my setup with an home-made 2.6.27-rc1

   Best regards,
     Vincent
> Bastian
-- 
Vincent Danjean       GPG key ID 0x9D025E87         vdanjean at debian.org
GPG key fingerprint: FC95 08A6 854D DB48 4B9A  8A94 0BF7 7867 9D02 5E87
Unofficial pacakges: http://www-id.imag.fr/~danjean/deb.html#package
APT repo:  deb http://perso.debian.org/~vdanjean/debian unstable main