[Xen-devel] pygrub gives "raise RuntimeError("Unable to find partition containing kernel")"

[Kevin Buckley <kevin.buckley.ecs.vuw.ac.nz@xxxxxxxxx>]

Hi there,

just came to try and boot a VM using the Xen i've building under LFS
and saw this in the bootloader log after the boot had failed:

# cat /media/sda5/root/bootloader.3.log
Using <class 'grub.GrubConf.Grub2ConfigFile'> to parse /boot/grub/grub.cfg
Traceback (most recent call last):
  File "/usr/lib/xen/bin/pygrub", line 928, in <module>
    raise RuntimeError("Unable to find partition containing kernel")
RuntimeError: Unable to find partition containing kernel

Having found this

  
https://tipstricks.itmatrix.eu/pygrub-unable-to-find-partition-containing-kernel/

which mentions this

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745419

the suggestion appears to be that this had been fixed in Xen, back in 2015 ?

Just in case I have missed something, here's what I have
as regards the VBD image I am trying to boot

# parted -s /dev/vg_xen_vbds/lv_4g_01 unit s print free
Model: Linux device-mapper (linear) (dm)
Disk /dev/dm-0: 8388608s
Sector size (logical/physical): 512B/4096B
Partition Table: msdos

Number  Start  End       Size      Type     File system  Flags
        63s    2047s     1985s              Free Space
 1      2048s  8388607s  8386560s  primary  ext4         boot

and here are the first 512 bytes of the image:

# dd if=/dev/vg_xen_vbds/lv_4g_01 of=first512 bs=512 count=1
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.000748337 s, 684 kB/s
root@flat36:~# xxd first512
0000000: eb63 9010 8ed0 bc00 b0b8 0000 8ed8 8ec0  .c..............
0000010: fbbe 007c bf00 06b9 0002 f3a4 ea21 0600  ...|.........!..
0000020: 00be be07 3804 750b 83c6 1081 fefe 0775  ....8.u........u
0000030: f3eb 16b4 02b0 01bb 007c b280 8a74 0302  .........|...t..
0000040: 8000 0080 0068 1000 0008 fa90 90f6 c280  .....h..........
0000050: 7502 b280 ea59 7c00 0031 0080 0100 0000  u....Y|..1......
0000060: 0000 0000 fffa 9090 f6c2 8074 05f6 c270  ...........t...p
0000070: 7402 b280 ea79 7c00 0031 c08e d88e d0bc  t....y|..1......
0000080: 0020 fba0 647c 3cff 7402 88c2 52bb 1704  . ..d|<.t...R...
0000090: 8027 0374 06be 887d e817 01be 057c b441  .'.t...}.....|.A
00000a0: bbaa 55cd 135a 5272 3d81 fb55 aa75 3783  ..U..ZRr=..U.u7.
00000b0: e101 7432 31c0 8944 0440 8844 ff89 4402  ..t21..D.@.D..D.
00000c0: c704 1000 668b 1e5c 7c66 895c 0866 8b1e  ....f..\|f.\.f..
00000d0: 607c 6689 5c0c c744 0600 70b4 42cd 1372  `|f.\..D..p.B..r
00000e0: 05bb 0070 eb76 b408 cd13 730d f6c2 800f  ...p.v....s.....
00000f0: 84d0 00be 937d e982 0066 0fb6 c688 64ff  .....}...f....d.
0000100: 4066 8944 040f b6d1 c1e2 0288 e888 f440  @f.D...........@
0000110: 8944 080f b6c2 c0e8 0266 8904 66a1 607c  .D.......f..f.`|
0000120: 6609 c075 4e66 a15c 7c66 31d2 66f7 3488  f..uNf.\|f1.f.4.
0000130: d131 d266 f774 043b 4408 7d37 fec1 88c5  .1.f.t.;D.}7....
0000140: 30c0 c1e8 0208 c188 d05a 88c6 bb00 708e  0........Z....p.
0000150: c331 dbb8 0102 cd13 721e 8cc3 601e b900  .1......r...`...
0000160: 018e db31 f6bf 0080 8ec6 fcf3 a51f 61ff  ...1..........a.
0000170: 265a 7cbe 8e7d eb03 be9d 7de8 3400 bea2  &Z|..}....}.4...
0000180: 7de8 2e00 cd18 ebfe 4752 5542 2000 4765  }.......GRUB .Ge
0000190: 6f6d 0048 6172 6420 4469 736b 0052 6561  om.Hard Disk.Rea
00001a0: 6400 2045 7272 6f72 0d0a 00bb 0100 b40e  d. Error........
00001b0: cd10 ac3c 0075 f4c3 9d7c 0200 0000 8020  ...<.u...|.....
00001c0: 2100 832a a00a 0008 0000 00f8 7f00 0000  !..*............
00001d0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00001e0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00001f0: 0000 0000 0000 0000 0000 0000 0000 55aa  ..............U.

I am able to boot the VM using the Xen 4.4 from a Ubuntu 14 system,
but the Xen I built under LFS (which was taken from commit cb70a26
as per my earlier posts about building on systems that may not have
a "python") gives me the "Unable to find partition containing kernel" error

Any clues?
Kevin

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