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Re: Debian 11 guest installer crash and reboot

Hi Andy,

I'm having possibly the same issue as John (installing Debian 11 via
netinst in HVM mode crashes). I'm having no problems booting the
installer in PVH mode like you, however, would I be correct in saying
HVM mode is necessary for PCI passthrough?

Host 1: Ubuntu 20.04.02 LTS / Xen 4.14.3 (compiled from source)
Host 2: Debian 11 / Xen 4.14.3 (installed via apt)

Attaching a serial console to the guest (via xl console) on both hosts
and booting the installer kernel with console=ttyS0,115200n8 manifests
a 'kernel panic - not syncing' error.

[   XX.XXXXXX] Run /init as init process
[   XX.XXXXXX] synth uevent: /devices/virtual/input/input1: failed to
send uevent
[   XX.XXXXXX] input input1: uevent: failed to send synthetic uevent
Failed to write 'add' to '/sys/devices/virtual/input/input1/uevent':
Cannot allocate memory
[   XX.XXXXXX] SCSI subsystem initialized
[   XX.XXXXXX] Invalid max_queues (4), will use default max: 1.
[   XX.XXXXXX] Kernel panic - not syncing: Attempted to kill init!
[   XX.XXXXXX] CPU: 0 PID: 1 Comm: init Not tainted 5.10.0-8-amd64 #1
Debian 5.10.46-3
[   XX.XXXXXX] Hardware name: Xen HVM domU, BIOS 4.14.3-pre 07/30/2021

The linked Debian bug report below (if in fact relevant) appears to
suggest an upstream issue regarding udevadm and the Xen Virtual
Keyboard driver?



On Mon, 16 Aug 2021 at 17:48, Andy Smith <andy@xxxxxxxxxxxxxx> wrote:
> Hello,
> On Mon, Aug 16, 2021 at 02:00:06PM +0800, John Mok wrote:
> >  Host: Xen 4.11.4 on Debian 10
> > Guest: Debian 11 (kernel 5.10)
> >
> > Here is the steps to reproduce the problem:-
> > 1) Either guest BIOS or OVMF boot
> > 2) Select "Expert install" on installation menu
> I'm having no problems booting the installer and installing a Debian
> 11 guest in PVH mode, so I assume this must be HVM mode, which I
> have not tried. That is with Xen 4.14.2 though.
> 4.11 is EOL now so neither Debian nor Xen is likely going to be able
> to help you with that. You should try installing a more up to date
> hypervisor version and trying again.
>     https://xenbits.xen.org/docs/unstable/support-matrix.html
> If it still happens with a supproted hypervisor version then Xen
> devs are probably going to want to see debug output from dom0 and
> domU, so booting dom0 with "log_lvl=all guest_loglvl=all" on the
> hypervisor command line and starting with "xl -v create -f
> guest.cfg" would be a good idea.
> Cheers,
> Andy



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