On Thu, Jan 7, 2021, 16:48 Łukasz Kołaciński <l.kolacinski@storware.eu> wrote:
...
2020-12-08 10:18:35,451+01 INFO  [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (ForkJoinPool-1-worker-31) [] VM '35183baa-1c70-4016-b7cd-528889876f19'(stor2rrd) moved from 'Up' --> 'Down'
2020-12-08 10:18:35,466+01 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (ForkJoinPool-1-worker-31) [] EVENT_ID: VM_DOWN_ERROR(119), VM stor2rrd is down with error. Exit message: Lost connection with qemu process.

Looks like qemu crashed when stopping the backup. 

Can you file a bug for this, and attach logs?

We these logs from host the vm was running on:
- /var/log/vdsm/vdsm.log (the right log showing the time backup was stopped)
- /var/log/ovirt-imageio/daemon.log
- /var/log/libvirt/libvird.log (may be missing)
- /var/log/libvirt/qemu/<vm-name>.log

Also the vm xml (virsh -r dumpxml vm-name).

... 
The environment of faulty host is:
OS Version: RHEL - 8.3 - 1.0.el8
OS Description: Red Hat Enterprise Linux 8.3 (Ootpa)
Kernel Version: 4.18.0 - 240.1.1.el8_3.x86_64
KVM Version: 5.1.0 - 14.module+el8.3.0+8438+644aff69
LIBVIRT Version: libvirt-6.6.0-7.module+el8.3.0+8424+5ea525c5

I never had any issue with these version:

# rpm -q libvirt-daemon qemu-kvm
libvirt-daemon-6.6.0-8.module+el8.3.1+8648+130818f2.x86_64
qemu-kvm-5.1.0-13.module+el8.3.0+8424+e82f331d.x86_64
 
Looks like you run older libvirt version, but have newer qemu version.
Where did you got these packages?

Are you running on RHEL or Centos?

Nir