Bug#597563: grub-common: grub-probe segfaults scanning lvm devices

[Matthew Gabeler-Lee]

On Sat, 8 Jan 2011, Vladimir 'φ-coder/phcoder' Serbinenko wrote:

> As was recommended I forward the remaining part to linux-raid mailing list.
> In short: on his system mdraid, raid5, 4 devices, metadata (presumably)
> 0.90, two devices have index 0.
> If such situation is valid please advice me on how such situation should
> be handled.
> @Matthew: could you supply mdadm -Q outputput and *last* 64K of every disk?

$ sudo mdadm -QD /dev/md2
/dev/md2:
         Version : 0.90
   Creation Time : Mon Mar 27 14:04:18 2006
      Raid Level : raid5
      Array Size : 2185667136 (2084.41 GiB 2238.12 GB)
   Used Dev Size : 728555712 (694.80 GiB 746.04 GB)
    Raid Devices : 4
   Total Devices : 4
Preferred Minor : 2
     Persistence : Superblock is persistent

     Update Time : Sat Jan  8 17:40:20 2011
           State : clean
  Active Devices : 4
Working Devices : 4
  Failed Devices : 0
   Spare Devices : 0

          Layout : left-symmetric
      Chunk Size : 64K

            UUID : 01e2f978:88d1f867:34e1e46c:f3c01470
          Events : 0.32040050

     Number   Major   Minor   RaidDevice State
        0       8       35        0      active sync   /dev/sdc3
        1       8       19        1      active sync   /dev/sdb3
        2       8        3        2      active sync   /dev/sda3
        3       8       51        3      active sync   /dev/sdd3

The actual last 64k of all the partitions in the array is all zeros. 
So is the 64k up to the end of the "Used Dev Size".  What has some data 
in it is the 64k after that.  I hope that has the superblock data I 
presume you're looking for.  I.e.  dd if=/dev/sdX3 bs=1024 
skip=728555712 count=64.

-- 
 	-Matt
"Reality is that which, when you stop believing in it, doesn't go away".
                 -- Philip K. Dick
GPG pubkey fingerprint: A57F B354 FD30 A502 795B 9637 3EF1 3F22 A85E 2AD1
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