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

[Brian Murray]

Could you test the new version of amd64-microcode which has been
uploaded to trusty-proposed?

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

Status in amd64-microcode package in Ubuntu:
  Confirmed

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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