Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (virt:rhel bug fix update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2021:0542
Verify with version qemu-kvm-4.2.0-34.module+el8.3.0+9828+7aab3355.3 Steps to Reproduce: 1.Start guest with virtio serial and start guest agent inside the guest and add two disks. 2.execute guest-get-disks in the unix socked, but there are some test situation like following items: [root@dell-per440-06 qemu-kvm]# nc -U /tmp/helloworld2 {"execute":"guest-ping"} {"return": {}} {"execute":"guest-ping"} {"return": {}} {"execute":"guest-info"} {"return": {"version": "4.2.0", "supported_commands": [{"enabled": true, "name": "guest-get-osinfo", "success-response": true}, {"enabled": true, "name": "guest-get-timezone", "success-response": true}, {"enabled": true, "name": "guest-get-users", "success-response": true}, {"enabled": true, "name": "guest-get-host-name", "success-response": true}, {"enabled": false, "name": "guest-exec", "success-response": true}, {"enabled": false, "name": "guest-exec-status", "success-response": true}, {"enabled": true, "name": "guest-get-memory-block-info", "success-response": true}, {"enabled": true, "name": "guest-set-memory-blocks", "success-response": true}, {"enabled": true, "name": "guest-get-memory-blocks", "success-response": true}, {"enabled": true, "name": "guest-set-user-password", "success-response": true}, {"enabled": true, "name": "guest-get-fsinfo", "success-response": true}, {"enabled": true, "name": "guest-get-disks", "success-response": true}, ... {"execute":"guest-get-disks"} {"return": [{"name": "/dev/vda", "dependencies": [], "partition": false, "address": {"bus-type": "virtio", "bus": 0, "unit": 0, "pci-controller": {"bus": 0, "slot": 6, "domain": 0, "function": 0}, "dev": "/dev/vda", "target": 0}}, {"name": "/dev/sda", "dependencies": [], "partition": false, "address": {"serial": "0QEMU_QEMU_HARDDISK_kk", "bus-type": "scsi", "bus": 0, "unit": 0, "pci-controller": {"bus": 4, "slot": 0, "domain": 0, "function": 0}, "dev": "/dev/sda", "target": 0}}, {"name": "/dev/dm-0", "dependencies": ["/dev/vdb2"], "partition": false, "alias": "rhel_bootp--73--75--166-root"}, {"name": "/dev/vdb1", "dependencies": ["/dev/vdb"], "partition": true}, {"name": "/dev/vdb2", "dependencies": ["/dev/vdb"], "partition": true}, {"name": "/dev/vdb", "dependencies": [], "partition": false, "address": {"bus-type": "virtio", "bus": 0, "unit": 0, "pci-controller": {"bus": 2, "slot": 0, "domain": 0, "function": 0}, "dev": "/dev/vdb", "target": 0}}, {"name": "/dev/dm-1", "dependencies": ["/dev/vdb2"], "partition": false, "alias": "rhel_bootp--73--75--166-swap"}]} Check on guest: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 20G 0 disk vda 252:0 0 20G 0 disk vdb 252:16 0 20G 0 disk ├─vdb1 252:17 0 1G 0 part /boot └─vdb2 252:18 0 19G 0 part ├─rhel_bootp--73--75--166-root 253:0 0 17G 0 lvm / └─rhel_bootp--73--75--166-swap 253:1 0 2G 0 lvm [SWAP] 3. Partition, format and mount one of the disks, check info: {"execute":"guest-get-disks"} {"return": [{"name": "/dev/vda", "dependencies": [], "partition": false, "address": {"bus-type": "virtio", "bus": 0, "unit": 0, "pci-controller": {"bus": 0, "slot": 6, "domain": 0, "function": 0}, "dev": "/dev/vda", "target": 0}}, {"name": "/dev/sda1", "dependencies": ["/dev/sda"], "partition": true}, {"name": "/dev/sda", "dependencies": [], "partition": false, "address": {"serial": "0QEMU_QEMU_HARDDISK_kk", "bus-type": "scsi", "bus": 0, "unit": 0, "pci-controller": {"bus": 4, "slot": 0, "domain": 0, "function": 0}, "dev": "/dev/sda", "target": 0}}, {"name": "/dev/dm-0", "dependencies": ["/dev/vdb2"], "partition": false, "alias": "rhel_bootp--73--75--166-root"}, {"name": "/dev/vdb1", "dependencies": ["/dev/vdb"], "partition": true}, {"name": "/dev/vdb2", "dependencies": ["/dev/vdb"], "partition": true}, {"name": "/dev/vdb", "dependencies": [], "partition": false, "address": {"bus-type": "virtio", "bus": 0, "unit": 0, "pci-controller": {"bus": 2, "slot": 0, "domain": 0, "function": 0}, "dev": "/dev/vdb", "target": 0}}, {"name": "/dev/dm-1", "dependencies": ["/dev/vdb2"], "partition": false, "alias": "rhel_bootp--73--75--166-swap"}] Check on guest: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 20G 0 disk └─sda1 8:1 0 20G 0 part /mnt/sda1 vda 252:0 0 20G 0 disk vdb 252:16 0 20G 0 disk ├─vdb1 252:17 0 1G 0 part /boot └─vdb2 252:18 0 19G 0 part ├─rhel_bootp--73--75--166-root 253:0 0 17G 0 lvm / └─rhel_bootp--73--75--166-swap 253:1 0 2G 0 lvm [SWAP] 4. umount in guest and check disks info {"execute":"guest-get-disks"} {"return": [{"name": "/dev/vda", "dependencies": [], "partition": false, "address": {"bus-type": "virtio", "bus": 0, "unit": 0, "pci-controller": {"bus": 0, "slot": 6, "domain": 0, "function": 0}, "dev": "/dev/vda", "target": 0}}, {"name": "/dev/sda1", "dependencies": ["/dev/sda"], "partition": true}, {"name": "/dev/sda", "dependencies": [], "partition": false, "address": {"serial": "0QEMU_QEMU_HARDDISK_kk", "bus-type": "scsi", "bus": 0, "unit": 0, "pci-controller": {"bus": 4, "slot": 0, "domain": 0, "function": 0}, "dev": "/dev/sda", "target": 0}}, {"name": "/dev/dm-0", "dependencies": ["/dev/vdb2"], "partition": false, "alias": "rhel_bootp--73--75--166-root"}, {"name": "/dev/vdb1", "dependencies": ["/dev/vdb"], "partition": true}, {"name": "/dev/vdb2", "dependencies": ["/dev/vdb"], "partition": true}, {"name": "/dev/vdb", "dependencies": [], "partition": false, "address": {"bus-type": "virtio", "bus": 0, "unit": 0, "pci-controller": {"bus": 2, "slot": 0, "domain": 0, "function": 0}, "dev": "/dev/vdb", "target": 0}}, {"name": "/dev/dm-1", "dependencies": ["/dev/vdb2"], "partition": false, "alias": "rhel_bootp--73--75--166-swap"}]} Check on guest: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 20G 0 disk vda 252:0 0 20G 0 disk vdb 252:16 0 20G 0 disk ├─vdb1 252:17 0 1G 0 part /boot └─vdb2 252:18 0 19G 0 part ├─rhel_bootp--73--75--166-root 253:0 0 17G 0 lvm / └─rhel_bootp--73--75--166-swap 253:1 0 2G 0 lvm [SWAP] 5) delete one disk in guest and check disks info: {"execute":"guest-get-disks"} {"return": [{"name": "/dev/vda1", "dependencies": ["/dev/vda"], "partition": true}, {"name": "/dev/vda2", "dependencies": ["/dev/vda"], "partition": true}, {"name": "/dev/vda", "dependencies": [], "partition": false, "address": {"bus-type": "virtio", "bus": 0, "unit": 0, "pci-controller": {"bus": 2, "slot": 0, "domain": 0, "function": 0}, "dev": "/dev/vda", "target": 0}}, {"name": "/dev/sda1", "dependencies": ["/dev/sda"], "partition": true}, {"name": "/dev/sda", "dependencies": [], "partition": false, "address": {"serial": "0QEMU_QEMU_HARDDISK_kk", "bus-type": "scsi", "bus": 0, "unit": 0, "pci-controller": {"bus": 4, "slot": 0, "domain": 0, "function": 0}, "dev": "/dev/sda", "target": 0}}, {"name": "/dev/dm-0", "dependencies": ["/dev/vda2"], "partition": false, "alias": "rhel_bootp--73--75--166-root"}, {"name": "/dev/dm-1", "dependencies": ["/dev/vda2"], "partition": false, "alias": "rhel_bootp--73--75--166-swap"}]} Check on guest: AME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 20G 0 disk └─sda1 8:1 0 20G 0 part vda 252:0 0 20G 0 disk ├─vda1 252:1 0 1G 0 part /boot └─vda2 252:2 0 19G 0 part ├─rhel_bootp--73--75--166-root 253:0 0 17G 0 lvm / └─rhel_bootp--73--75--166-swap 253:1 0 2G 0 lvm [SWAP]