[Bug 1817302] Re: growpart changes diskid of mbr disks

[Juerg Haefliger]

https://lore.kernel.org/util-
linux/20190222160412.26652-1-juergh at canonical.com

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Title:
  growpart changes diskid of mbr disks

Status in util-linux package in Ubuntu:
  New

Bug description:
  When growpart is run against a disk with a dos partition table, it
  evidently changes the disk id in the MBR.  This was noticed because
  the diskid is part of the "PARTUUID" that is synthesized for DOS
  partitions (unlike GPT, which has UUIDs for each partition as part of
  the partition table).

  This means that if someone is using root=PARTUUID=foo on the kernel
  commandline, the cloud image will successfully boot exactly once, and
  subsequently fail to boot because the partition uuid has changed.

  I don't know at this point if this is a bug in cloud-utils or in
  sfdisk (util-linux).

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