飞牛升级最新的1.30系统后pve无法备份，一备份就卡死，飞牛虚拟机开了QEMU Guest Agent，必须关机飞牛虚拟机才能备份
VM is locked (backup) (500)
INFO: starting new backup **: vzdump 100 --remove 0 --notes-template '{{guestname}}' --compress zstd --node laohe-nas --storage sharebackup --notification-mode notification-system --mode snapshot
INFO: Starting Backup of VM 100 (qemu)
INFO: Backup started at 2026-04-25 22:15:41
INFO: status = running
INFO: VM Name: Fnos-Lsi
INFO: include disk 'scsi0' 'local-lvm:vm-100-disk-1' 70G
INFO: include disk 'scsi1' 'local-lvm:vm-100-disk-2' 150G
INFO: include disk 'efidisk0' 'local-lvm:vm-100-disk-0' 4M
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating vzdump archive '/mnt/pve/sharebackup/dump/vzdump-qemu-100-2026_04_25-22_15_41.vma.zst'
INFO: issuing guest-agent 'fs-freeze' command
INFO: starting backup via QMP command
