[Pkg-xen-devel] Bug#994870: Memory allocation problem for VM after xen security update

[H.-R. Oberhage]

Package: xen-system-amd64
Version: 4.14.3-1~deb11u1

After applying the buster security update to xen, my VM won't start
any longer, complaining about a memory allocation error.

Switching back to the previous version 4.14.2+25-gb6a8c4f72d-2 lets
the VM start (again,) normally.

/var/log/libvirt/libxl/libxl-driver.log:
2021-09-21 14:01:44.645+0000: xc: panic: xc_dom_boot.c:120: 
xc_dom_boot_mem_init: can't allocate low memory for domain: Out of 
memory
2021-09-21 14:01:44.653+0000: libxl: libxl_dom.c:593:libxl__build_dom: 
xc_dom_boot_mem_init failed: Die Operation wird nicht unterstützt 
[means: the operation is not supported]
2021-09-21 14:01:44.662+0000: libxl: 
libxl_create.c:1576:domcreate_rebuild_done: Domain 1:cannot (re-)build 
domain: -3

The error is triggered, regardless if there was a boot-parameter
"dom0_mem=1024M:max=2048M" set or not.
/etc/xen/xl.conf was unaltered, i.e. 'autoballoon' was implicitely set
to "auto".

I am "on" Buster, kernel 5.10.0-8-amd64 (5.10.46-4), all relevant fixes
included.

Best regards,
  Ruediger Oberhage
-- 
Dr. H.-R. Oberhage
Mail: Univ. Duisburg-Essen	E-Mail: oberhage at Uni-Duisburg-Essen.DE
       Fakultaet fuer Physik	ruediger at Theo.Physik.Uni-Duisburg-Essen.DE