[Bug 2094979] [NEW] curtin misidentify /dev/md126p3 as a multipath device, generates unbootable grub config

[Yao Wei]

Public bug reported:

(Note that it shares the same log as LP: #2094966)

We found that, on system with Intel firmware RAID (IMSM), when doing OEM
factory reset, subiquity can finish the installation, but curtin will
install a GRUB config that forces device to boot into multipath device
/dev/mapper/mpath0-part3

Log suggests that it detects /dev/md126p3 as a multipath device, but it
should not be.

** Affects: curtin
     Importance: Undecided
         Status: New

** Affects: oem-priority
     Importance: Undecided
         Status: New


** Tags: jira-somerville-1627 oem-priority

** Attachment added: "lp2094966-installer.tar.xz"
   https://bugs.launchpad.net/bugs/2094979/+attachment/5851848/+files/lp2094966-installer.tar.xz

** Tags added: jira-somerville-1627 oem-priority

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https://bugs.launchpad.net/bugs/2094979

Title:
  curtin misidentify /dev/md126p3 as a multipath device, generates
  unbootable grub config

Status in curtin:
  New
Status in OEM Priority Project:
  New

Bug description:
  (Note that it shares the same log as LP: #2094966)

  We found that, on system with Intel firmware RAID (IMSM), when doing
  OEM factory reset, subiquity can finish the installation, but curtin
  will install a GRUB config that forces device to boot into multipath
  device /dev/mapper/mpath0-part3

  Log suggests that it detects /dev/md126p3 as a multipath device, but
  it should not be.

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