AMD Ryzen 3000 series fails to boot
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
systemd (Ubuntu) |
Fix Released
|
High
|
Balint Reczey | ||
Disco |
Fix Released
|
Undecided
|
Balint Reczey | ||
Eoan |
Fix Released
|
High
|
Balint Reczey |
Bug Description
[Impact]
* Systems with AMD Ryzen 3000 series CPUs don't boot.
[Test Case]
* Boot with fixed systemd on an AMD Ryzen 3000 series system.
[Regression Potential]
* The fix itself is very small, it ignores known to be faulty random values returned by the rdrand instruction and use a different random source. Those values can still be returned by a properly working rdrand implementation in 2 in 2^32 cases on 32 bit arches and in 2 in 2^64 cases on 64 bit arches, but the fallback to the other random source ensures that in those rare occasions a random number can be generated.
[Original Bug Text]
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:/
I am currently testing a patch to systemd, derived from this pull request:
https:/
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.
Changed in systemd (Ubuntu): | |
assignee: | nobody → Balint Reczey (rbalint) |
status: | Confirmed → In Progress |
Changed in systemd (Ubuntu Disco): | |
status: | New → In Progress |
description: | updated |
tags: | removed: rls-dd-incoming rls-ee-incoming |
Changed in systemd (Ubuntu Eoan): | |
status: | In Progress → Fix Committed |
The attachment "Rebase of https:/ /github. com/systemd/ systemd/ pull/12536" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.
[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]