Re: Debian 11 guest installer crash and reboot

[C Stainer <chr.stainer@xxxxxxxxx>]

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!
exitcode=0x00000100
[   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?

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=983357

C

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
>