[Bug 1809168] Re: FIPS and Ubuntu standard kernels prior to 4.11.0 won't boot; root device not found

We now believe this to be the case. The above is an issue
of new HW enablement.

I believe this can be closed Will Not Fix.

For standard kernels, enablement available via the -hwe
kernel upgrade.

For FIPS kernels, new HW enablement is not expected to be
backported/patched in existing 4.4.0-baseed releases.

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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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