[Bug 1835809] Re: AMD Ryzen 3000 series fails to boot

[Sebastien Bacher]

Thanks for your bug report & patch!

I'm subscribing ubuntu-sponsors which is what is needed for the bug to
get on the sponsoring queue
(http://reqorts.qa.ubuntu.com/reports/sponsoring/index.html)

I'm also tagging the bug rls-dd-incoming and rls-ee-incoming so it gets
on the list of targetted to review which should help visibility

** Changed in: systemd (Ubuntu)
   Importance: Undecided => High

** Tags added: rls-dd-incoming rls-ee-incoming

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https://bugs.launchpad.net/bugs/1835809

Title:
  AMD Ryzen 3000 series fails to boot

Status in systemd package in Ubuntu:
  New

Bug description:
  On the new AMD Ryzen 3000 series CPUs, there is an issue with systemd
  preventing the boot process from completing. This issue does not
  affect the older systemd version in 18.04, but affects the 19.04
  version.

  Here is a screenshot showing what happens:
  https://www.phoronix.net/image.php?id=ryzen-3700x-3900x-linux&image=amd_zen2_14_show

  I am currently testing a patch to systemd, derived from this pull request:
  https://github.com/systemd/systemd/pull/12536

  This is a high severity issue, as I do not believe there is no
  potential workaround without either a firmware update or an ISO
  respin.

  I have attached a rebase of the potential patch on the current 19.04
  version of systemd for reference. I will provide more details after
  testing.

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