[Bug 1853773] Re: Regression: amd64-microcode upgrade causes a bootloop

[Robie Basak]

*** This bug is a duplicate of bug 1853614 ***
    https://bugs.launchpad.net/bugs/1853614

** This bug has been marked a duplicate of bug 1853614
   System stuck in reboot loop on AMD EPYC 7542 32-Core Processor

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https://bugs.launchpad.net/bugs/1853773

Title:
  Regression: amd64-microcode upgrade causes a bootloop

Status in amd64-microcode package in Ubuntu:
  New

Bug description:
  it turned out that the latest amd64-microcode causes a boot loop on
  our new dual socket server (equipped with two AMD EPYC 7252 8-Core
  Processors).

  steps to reproduce ...

    (1) install Ubuntu-Server 18.04.3 LTS (20190805)
    (2) reboot
    (3) apt update
    (4) apt upgrade
    (5) reboot
    ... boot loop ...

  workaround ...

    before (4) prevent a amd64-microcode package upgrade by setting the
  package on hold

       apt-mark hold amd64-microcode

  further information regarding amd64-microcode ...

     - this version causes a boot loop: 3.20191021.1ubuntu0.18.04.2
     - this version is working fine:   3.20180524.1~ubuntu0.18.04.2

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