add_bitmap failed: Operation not permitted

[meilihao]

Affected version

• oVirt Engine: ovirt-engine-4.4.10.7-1.el8.noarch
• Host OS Variant:oVirt Node 4.4.10
• VDSM version: vdsm-4.40.100.2-1.el8.x86_64
• qemu-kvm: 6.2.0-5

Describe the bug

backup failed:

vdsm log:

To reproduce

backup vm

Expected behavior
backup vm is ok

[meilihao]

There is a file whose owner is root, I have no idea how it appeared. It should be caused by my misoperation