Could not initialize refcount handling:

listy Wed, 15 Jul 2026 04:41:39 -0700

Hi guys.

Perhaps not the first place this mailing list might be,however _users_ one seems pretty quiet, thus I'm trying here.


My qemu cannot start a domain:

-> $ virsh create /etc/libvirt/qemu/pacemaker.d/ubusrv2.xml

error: Failed to create domain from/etc/libvirt/qemu/pacemaker.d/ubusrv2.xmlerror: internal error: QEMU unexpectedly closed the monitor(vm='ubusrv2'): 2026-07-15T11:25:13.789834Z qemu-kvm:-blockdev{"node-name":"libvirt-2-format","read-only":false,"discard":"unmap","cache":{"direct":true,"no-flush":false},"driver":"qcow2","encrypt":{"format":"luks","key-secret":"libvirt-2-format-encryption-secret0"},"file":"libvirt-2-storage","backing":null}:Could not initialize refcount handling: Input/output error


I qemu check the image:
...
No errors were found on the image.

584043/901120 = 64.81% allocated, 20.63% fragmented, 0.00%compressed clusters

Image end offset: 38286524416

-> $ __myQcowInfo --info /X0-STORAGEs/0/X-VMs-BKPs/ubusrv2.qcow2

image: json:{"encrypt.key-secret": "my-sec0", "driver":"qcow2", "file": {"driver": "file", "filename":"/X0-STORAGEs/0/X-VMs-BKPs/ubusrv2.qcow2"}}

file format: qcow2
virtual size: 55 GiB (59055800320 bytes)
disk size: 35.7 GiB
encrypted: yes
cluster_size: 65536
Format specific information:
    compat: 1.1
    compression type: zlib
    lazy refcounts: false
    refcount bits: 16
    encrypt:
        ivgen alg: plain64
        detached header: false
        hash alg: sha256
        cipher alg: aes-256
        uuid: 1809fc93-5ae7-4f9e-bf2c-2c3d25364859
        format: luks
        cipher mode: xts
        slots:

I think this might have happened after:
$ -> virsh backup-begin ...
but I'm not 100% sure.

qemu-img version 10.1.0 (qemu-kvm-10.1.0-24.el10)

Any thoughts on how to solve/fix this I'll appreciate a lot.
many thanks, L.

Could not initialize refcount handling:

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