[Bug 1759920] Re: intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-image-4.13.0-37-generic)

[John Bryant]

It behaves a little differently. Before, it would clear the screen and
get stuck. Now it shows this:

[   36.067981] watchdog: BUG: soft lockup - CPU#5 stuck for 22s! [kworker/5:1:71]
[   36.067983] watchdog: BUG: soft lockup - CPU#6 stuck for 22s! [thermald:1113]
[   36.527766] NMI watchdog: Watchdog detected hard LOCKUP on cpu 0
[   37.482793] NMI watchdog: Watchdog detected hard LOCKUP on cpu 3
[   41.598740] NMI watchdog: Watchdog detected hard LOCKUP on cpu 1

Then there's a couple repeats of the first 2 lines at later times.

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Title:
  intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
  image-4.13.0-37-generic)

Status in intel-microcode package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in intel-microcode source package in Artful:
  Confirmed
Status in linux source package in Artful:
  Confirmed

Bug description:
  I don't know if this is a problem with the kernel or the microcode,
  but we have a significant number of computers in our organization (on
  both 16.04 and 17.10) that fail if they have both updated.  Booting
  with either linux-image-4.13.0-36-generic or intel-microcode
  3.20180108.0+really20170707ubuntu17.10.1 allows all these computers to
  boot.

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