[Bug 1853614] Re: System stuck in reboot loop on AMD EPYC 7542 32-Core Processor

[Juul Spies]

I can confirm there are no issues when booting with the package from the
ubuntu-security-proposed PPA.

amd64-microcode:
  Installed: 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1
  Candidate: 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1
  Version table:
 *** 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1 500
        500 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status


/proc/cpuinfo:
vendor_id	: AuthenticAMD
cpu family	: 23
model		: 49
model name	: AMD EPYC 7402P 24-Core Processor
stepping	: 0
microcode	: 0x830101c

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https://bugs.launchpad.net/bugs/1853614

Title:
  System stuck in reboot loop on AMD EPYC 7542 32-Core Processor

Status in amd64-microcode package in Ubuntu:
  Confirmed

Bug description:
  After installing latest microcode update: version
  3.20191021.1ubuntu0.18.04.2, the system is stuck in a reboot loop. De-
  installing the amd64-microcode package fixes the issue.

  CPU details
  vendor_id       : AuthenticAMD
  cpu family      : 23
  model           : 49
  model name      : AMD EPYC 7542 32-Core Processor
  stepping        : 0
  microcode       : 0x830101c <- 3.20180524.1ubuntu1 version is the newest one known to work

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