[Bug 1825189] Re: Using full disk encryption, on a multipath device (in this case FCP) ended up in trying to open/unlock a wrong DM device

[Frank Heimes]

** Changed in: ubuntu-z-systems
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1825189

Title:
  Using full disk encryption, on a multipath device (in this case FCP)
  ended up in trying to open/unlock a wrong DM device

Status in Ubuntu on IBM z Systems:
  In Progress
Status in debian-installer package in Ubuntu:
  New
Status in multipath-tools package in Ubuntu:
  Fix Released

Bug description:
  When doing a full disk encrypted installation with d-i using
  "Guided - use entire disk and setup encrypted LVM"
  on a multipath device (in this case zFCP/SCSI)
  the post-install reboot ends in busybox/initramfs
  while trying to open/unlock an incorrect device-maper device.
  initrd tries to open /dev/mapper/mpatha5 but only /dev/mapper/mpatha-part5 exists.

  Fixing the wrong device in crypttab like:
  echo "mpatha5_crypt /dev/mapper/mpatha-part5 none luks,discard" > ./
  cryptroot/crypttab
  and trying to open it manually:
  cryptsetup open --key-file /etc/zkey/repository/mpatha5_crypt.skey --key-size 1024 --cipher paes-xts-plain64 /dev/mapper/mpatha-part5 mpatha5_crypt
  and leaving busybox again seems to work.

  For more details see attachment ...

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