[Bug 1912043] Re: grub2 fails to install/probe into md device with first drive not active (i.e. hot spare)

[Kees Cook]

** Summary changed:

- grub2 fails to install/probe into md device with hot spare
+ grub2 fails to install/probe into md device with first drive not active (i.e. hot spare)

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Title:
  grub2 fails to install/probe into md device with first drive not
  active (i.e. hot spare)

Status in grub2 package in Ubuntu:
  New

Bug description:
  grub2 appears to _sometimes_ ignore md devices with a hot spare:

  $ cat /proc/mdstat
  Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] 
  md5 : active raid1 sda2[2](S) sdb2[3] sde2[4]
        2925939136 blocks super 1.2 [2/2] [UU]
        bitmap: 2/22 pages [8KB], 65536KB chunk

  md6 : active raid1 sdf2[0] sdd2[2](S) sdk2[1]
        3902691136 blocks super 1.2 [2/2] [UU]
        bitmap: 1/30 pages [4KB], 65536KB chunk

  unused devices: <none>

  $ sudo grub-probe -vvv / 2>&1 | grep -E 'info: Inserting md/|error'
  grub-probe: info: Inserting md/6 (+0,7805382272) into systemvg (lvm)
  grub-probe: error: disk `lvmid/5R9E1M-V0xL-pEsR-74zV-3oOm-JorM-hb2Erw/WHUtMx-lZcd-2RmH-WVSk-Z0Et-qiqS-hFBd4u' not found.

  If I remove the hotspare from md5, everything works normally and I can
  install grub again. But md6 has a spare too... ?!

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