** Changed in: linux (Ubuntu)
     Assignee: Joseph Salisbury (jsalisbury) => (unassigned)

** Changed in: linux (Ubuntu Xenial)
     Assignee: Joseph Salisbury (jsalisbury) => (unassigned)

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https://bugs.launchpad.net/bugs/1809168

Title:
  FIPS and Ubuntu standard kernels prior to 4.11.0 won't boot; root
  device not found

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged

Bug description:
  [IMPACT]

  Booting of the Xenial-based FIPS kernel packages
  failed with disk not found errors on amd64.
  This was also observed on standard Ubuntu
  kernels prior to 4.11.0.

  FIPS
  ------
  1. linux-image-4.4.0-1002-fips <-- FAIL
  2. linux-image-4.4.0-1006-fips <-- FAIL

  UBUNTU
  ------------

  1. Bionic kernels all WORK

  2. Artful kernels:

     Ubuntu-4.11.0-1.6 <-- WORKS
     Ubuntu-4.10.0-26.30 <-- FAILS

  3. Xenial kernels:

     Ubuntu-hwe-4.11.0-12.17_16.04.1 <--- WORKS
     Ubuntu-hwe-4.10.0-43.47_16.04.1 <--- FAILS

     Ubuntu-lts-* <--- ALL FAIL
     Ubuntu-4.4.0-* <--- ALL FAIL

  We have narrowed down the window to be:

  4.11.0-1.6 (custom build) <--- WORKS
  4.10.0-43.47~16.04.1   <-- FAILS

  Also works:
  
https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11/linux-image-4.11.0-041100-generic_4.11.0-041100.201705041534_amd64.deb

  Symptoms
  -------------
  System cannot find the root disk and drops into
  an initramfs shell:

  mdadm script local-block "CREATE group disk not found"
  "Gave up waiting for root device. Common problems:
   - Boot args (cat /proc/cmdline)
     - Check rootdelay=...
     - Check root= ...
   - Missing modules (cat /proc/modules; ls/dev)
  ALERT! UUID=... does not exist. Dropping to a shell!

  ...
  (initramfs)_

  There does not appear to be any workaround so far.
  The disks are encrypted SSDs.

  Attaching commit list between the last known
  failing Artful kernel and earliest known
  working kernel (adjacent tags) and other info.

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