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

[Alex Murray]

All the comments on this bug mention removing the amd64-microcode
package - so it is not clear to me if this worked previously with the
older version of amd64-microcode. The security team has prepared updates
which revert this to the older version - can anyone who is affected by
this please try installing the amd64-microcode package from the ubuntu-
security-proposed PPA - https://launchpad.net/~ubuntu-security-
proposed/+archive/ubuntu/ppa/+packages - so we can understand if this
fixes the issue?

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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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