[Bug 1779092] Re: [regression] cyclic reboot caused by the amd microcode updater

[Steve Beattie]

To follow up on Tyler's comment, I have placed amd64-microcode
3.20180524.1~ubuntu0.14.04.3 in the ubuntu-security-proposed ppa
(https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa/)
that keeps the packaging the same as before, but includes the 17h family
microcode (along with an update for 16h family as well). It woul dbe
great if people with various AMD processors could test this, both to
confirm that things successfully boot and that the microcode is loaded
(should be reported in dmesg).

Including the output of the 'lscpu' command in any feedback would
especially be appreciated.

Thanks!

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https://bugs.launchpad.net/bugs/1779092

Title:
  [regression] cyclic reboot caused by the amd microcode updater

Status in amd64-microcode package in Ubuntu:
  Fix Released

Bug description:
  It happened like this:

  using kernel 3.13.0-144 (14.04) - ok
  jun 9: installed kernel 3.13.0-149 and rebooted - ok
  jun 21: installed some updates including update to the cpu microcode which was set up to execute at the next boot
  jun 28: rebooted to the same kernel 149 and the system went into cyclic reboot: shows grub screen, when the default kernel is selected reboots immediately with no messages and without creating any logs, nothing in /var/log with appropriate times
  booted to 144 - no issues
  tried upgrading to a new kernel (151) - same cyclic reboot
  booted back to 144

  I am not telling the microcode update is the culprit, but it is mighty
  suspicious. It cannot be uninstalled using standard tools without
  uninstalling the kernels packages (linux-generic, linux-image-generic,
  linux-generic-pae, linux-image-generic-pae). I have both intel-
  microcode and amd64-microcode installed (CPU is AMD phenom X4 975).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.13.0-144.193-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-144-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.29
  Architecture: i386
  Date: Thu Jun 28 13:04:38 2018
  InstallationDate: Installed on 2011-08-18 (2505 days ago)
  InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release i386 (20110427)
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to trusty on 2014-10-18 (1349 days ago)

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