Hello,
Am 22.09.21 um 20:54 schrieb Hans van Kranenburg:
Hi Ruediger,
On 9/22/21 11:37 AM, H.-R. Oberhage wrote:
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.
Can you confirm that this is a virtual machine that tries to boot a
32-bit kernel as PV type?
I can confirm this for three of my virtual machines.
The error message you are seeing is not particularly helpful, but it is
most likely related to this.
The fact that with this package update 32-bit PV guests fail to start is
indeed a regression problem, which is quite inconvenient for you, right now.
And for me. :-/
At this point I would really recommend to not wait for a fix to arrive
which makes it start again, but change your VM to use a 64-bit kernel.
How?
Let me know if you need help or run into problems while making this change.
Running 32-bit PV at all is already 'on life support' upstream for quite
a while now, and it also not under security support any more.
Ack.
FWIW, Debian 10 VMs with 32 bit running with PVH work fine. My important
VM is still Debian 9 however due to a software I can not simply upgrade.
In the long run, I'd suggest working towards having 64-bit guests in PVH
mode, since that's one of the best options we have these days.
Ack.
If there's a reason you really cannot switch to a 64-bit kernel or move
the functionality of this virtual machine to a new fully 64 bit system,
switching the virtualization type from PV to HVM would also be an option.
Thanks for your support.
Greets
Alex
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.
Apologies for the inconvenience,
Hans
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