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lost serial characters on boot
- To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 17 Oct 2025 18:09:54 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Denis Mukhin <dmkhn@xxxxxxxxx>
- Delivery-date: Fri, 17 Oct 2025 17:10:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi,
I think we've got a bug with the serial console. I'm reliably loosing a
small part of the boot message. e.g.:
(XEN) Latest ChangeSet: Fri Oct 17 17:24:59 2025 git:5e79cfcd2100
(XEN) build-id: d1536ff6698b3e3ba307d551abf
Family 25 (0x19 Stepping 1 (raw 00a00f11)
(XEN) BSP microcode revision: 0x0a001137
whereas from xl dmesg after the system boots, we see things correctly:
(XEN) Latest ChangeSet: Fri Oct 17 17:24:59 2025 git:5e79cfcd2100
(XEN) build-id: d1536ff6698b3b8968e883fc39e3ba307d551abf
(XEN) CPU Vendor: AMD, Family 25 (0x19), Model 1 (0x1), Stepping 1 (raw
00a00f11)
(XEN) BSP microcode revision: 0x0a001137
The lost bit of text differs even when rebooting the same Xen binary,
but it's always around this area, very early on boot.
I've been seeing this for a little while, but one of my common dev
machines is showing it fairly reliably at the moment.
Checking a transcript of the terminal, we're missing characters, rather
than having additional control characters causing the corruption.
I suppose I need to stare at console_init_preirq() some more, but if
anyone has ideas, I'm all ears.
~Andrew
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