backup-begin

[André Malm]

Den 2023-04-05 kl. 09:47, skrev Peter Krempa:
> The backup operation is quite complex so it is possible.
> Please have a look into /var/log/libvirt/qemu/$VMNAME.log to see whether
> qemu logged something like an assertion failure before crashing.
>
> Additionally you can have a look into 'coredumpctl' whether there are
> any recorded crashes of 'qemu-system-x86_64' and also possibly collect
> the backtrace.
>
> Also make sure to try updating the qemu package and see whether the bug
> reproduces.
>
> If yes, please collect the stack/back-trace, versions of qemu and
> libvirt, the contents of the VM log file and also ideally configure
> libvirt for debug logging and collect the debug log as well:
>
>    https://www.libvirt.org/kbase/debuglogs.html

In the $VMNAME.log: qemu-system-x86_64: ../../block/qcow2.c:5175: 
qcow2_get_specific_info: Assertion `false' failed.

I'm running libvirt 8.0.0, which is the latest version for my dist 
(ubuntu 22.04). If required how would I properly upgrade?

Looking at 
https://github.com/qemu/qemu/blob/0c8022876f2183f93e23a7314862140c94ee62e7/block/qcow2.c 
which would be the version of qcow2.c for 8.0.0 there seem to be some 
issue with qcow2 compat.

I'm using qcow2 compat 1.1, output of qemu-img info of the base and top 
image;

qemu-img info base.qcow2
image: base.qcow2
file format: qcow2
virtual size: 5 GiB (5368709120 bytes)
disk size: 1.9 GiB
cluster_size: 65536
Format specific information:
     compat: 1.1
     compression type: zlib
     lazy refcounts: false
     refcount bits: 16
     corrupt: false
     extended l2: false

qemu-img info -U top.qcow2
image: top.qcow2
file format: qcow2
virtual size: 60 GiB (64424509440 bytes)
disk size: 1.36 GiB
cluster_size: 65536
backing file: base.qcow2
backing file format: qcow2
Format specific information:
     compat: 1.1
     compression type: zlib
     lazy refcounts: false
     bitmaps:
         [0]:
             flags:
                 [0]: in-use
                 [1]: auto
             name: 1680670811
             granularity: 65536
     refcount bits: 16
     corrupt: false
     extended l2: false