Update DomU - Debian 11 - no loader found - Invalid kernel

[Ronny Wagner <r.wagner@xxxxxxxxx>]

Hello,

i use a Debian 10 Host (Dom0) with Xen 4.14.2.

I update a Debian (i386) DomU from buster to bullseye with the new kernel 
5.10.0-8-686-pae.

When i reboot the DomU, there is a fail message and the DomU don't start:
xc: error: panic: xc_dom_core.c:693: xc_dom_find_loader: no loader found: 
Invalid kernel
libxl: error: libxl_dom.c:578:libxl__build_dom: xc_dom_parse_image failed
libxl: error: libxl_create.c:1576:domcreate_rebuild_done: Domain 40:cannot 
(re-)build domain: -3
libxl: error: libxl_domain.c:1182:libxl__destroy_domid: Domain 40:Non-existant 
domain

DomU: ls -l /boot
-rw-r--r-- 1 root root       83 Aug  3 07:50 System.map-5.10.0-8-686-pae
-rw-r--r-- 1 root root   236162 Aug  3 07:50 config-5.10.0-8-686-pae
-rw-r--r-- 1 root root 23537504 Sep  8 14:44 initrd.img-5.10.0-8-686-pae
-rw-r--r-- 1 root root  4983136 Aug  3 07:50 vmlinuz-5.10.0-8-686-pae

I can use the old kernel linux-image-4.19.0-17-686-pae and boot the DomU.

DomU.cfg
bootloader = '/usr/local/lib/xen/bin/pygrub'
vcpus       = '4'
memory      = '768'
disk        = [
                  '/dev/vg0/DomU-disk,raw,xvda2,rw',
                  '/dev/vg0/DomU-swap,raw,xvda1,rw'
              ]
uuid = "XXXXXX"
vif         = [ 'ip=X.X.X.X, mac=XXXXXXXXXXXX' ]
boot="c"
apic=1 
acpi=1 
pae=1
serial="pty"
sdl=0
keymap="de"
usb=1
stdvga=1
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'

Anybody any ideas why and how i solve the problem?

Thanks for any help ??

Ronny

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