Note that your output with the patch is bogus, the UUID is wrong.  See
following from Kay Sievers (udev upstream):

> We've had a bug report filed for Ubuntu caused by vol_id not correctly
> detecting a RAID1 with 1.0 metadata:
>
>         https://bugs.launchpad.net/ubuntu/+source/udev/+bug/133773

Seems like a bug for metadata 1.0, yes.

> A patch is attached to the bug (attached again here), does this seem a
> reasonable fix?

But the UUID looks strange:
  ID_FS_UUID=9c0818c2:00000000:00000000:00000000

I see the same thing here with this patch:
  $ mdadm -E /dev/sda7
  Array UUID : 847bf627:97a28f2a:37e21246:25b446b1

  $ extras/volume_id/vol_id /dev/sda7
  ID_FS_UUID=2a8fa297:00000000:00000000:00000000

With a different one line fix to the lib it seems fine:
  $ extras/volume_id/vol_id /dev/sda7
  ID_FS_UUID_ENC=847bf627:97a28f2a:37e21246:25b446b1

-- 
[gutsy] partitions no longer detected as RAID components after repairing 
degraded RAID 1 mirror
https://bugs.launchpad.net/bugs/133773
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