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Re: [BUG] Linux kernel crash in amd_smn_init during PVH Dom0 boot on AMD EPYC
- To: Arthur Borsboom <arthurborsboom@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Fri, 21 Aug 2026 16:42:29 -0400
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- Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 21 Aug 2026 20:42:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2026-08-19 03:09, Arthur Borsboom wrote:
It has taken me about 1,5 day of work to find out why the screen
remained black, to determine where the problem was, how to retrieve
potential info by a serial-over-LAN console, subscribe to the mailing
list, and create this bug report to help.
Yes, this is annoying :/
On Wed, 19 Aug 2026 at 08:50, Jan Beulich <jbeulich@xxxxxxxx> wrote:
On 18.08.2026 23:47, Arthur Borsboom wrote:
Hi,
I am encountering an early Linux kernel crash when booting a PVH
Dom0 on an AMD EPYC system (Family 19h Model 97). PV boot on the
same system works fine. The crash occurs during amd_smn_init due
to a divide-by-zero exception.
That looks like the same issue I am trying to fix.
There is a potentially related bug report discussing a Linux patch
addressing AMD SMN initialization under Xen PVH:
https://patchew.org/linux/20260623211904.3674-1-jason.andryuk@xxxxxxx/
It seems there was an ongoing discussion between Linux devs who
seem to have the need to align with Xen devs for a proper/future-proof fix.
I am submitting this report to share raw hardware trace data and
help move this forward.
Yes, there was some discussion, but we have agreed on an approach.
[1]
https://patchew.org/linux/20260814214255.83127-1-jason.andryuk@xxxxxxx/20260814214255.83127-2-jason.andryuk@xxxxxxx/
This v2 is basically what was suggested by a maintainer, so it should be
picked up - hopefully soon.
Regards,
Jason
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