Comment 42 for bug 1960346

Can reproduce this bug with virtio-net-pci and virtio-blk-pci device on the latest rhel9.1.0 host with the test steps of Comment 2.

host version:
qemu-kvm-7.0.0-4.el9.x86_64
kernel-5.14.0-96.el9.x86_64
seabios-1.16.0-2.el9.x86_64
guest: rhel9.1.0

Test result:
hot-plug/unplug virtio-net-pci device in qmp:
{ "execute": "netdev_add","arguments": { "type": "tap", "id": "hostnet0" } }
{ "execute": "device_add","arguments": { "driver": "virtio-net-pci", "id": "net1", "bus": "pcie-root-port-5", "mac": "52:54:00:12:34:56", "netdev": "hostnet0" } }
{ "execute": "device_del", "arguments": { "id": "net1" } }{"return": {}}
{"return": {}}
{"return": {}}

{ "execute": "device_del", "arguments": { "id": "net1" } }
{"error": {"class": "GenericError", "desc": "Device net1 is already in the process of unplug"}}

hot-plug/unplug virtio-blk-pci device in qmp:
{"execute": "device_add", "arguments": {"driver": "virtio-blk-pci", "id": "stg1", "drive": "drive_stg1", "write-cache": "on", "bus": "pcie-root-port-4"}}
{"execute":"device_del","arguments":{"id":"stg1"}}
{"return": {}}
{"return": {}}

{"execute":"device_del","arguments":{"id":"stg1"}}
{"error": {"class": "GenericError", "desc": "Device stg1 is already in the process of unplug"}}

Boot a guest with cmd:
 /usr/libexec/qemu-kvm \
    -name 'avocado-vt-vm1' \
    -sandbox on \
    -machine q35,memory-backend=mem-machine_mem \
    -device pcie-root-port,id=pcie-root-port-0,multifunction=on,bus=pcie.0,addr=0x1,chassis=1 \
    -device pcie-pci-bridge,id=pcie-pci-bridge-0,addr=0x0,bus=pcie-root-port-0 \
    -nodefaults \
    -device VGA,bus=pcie.0,addr=0x2 \
    -m 16G \
    -object memory-backend-ram,size=16G,id=mem-machine_mem \
    -smp 6,maxcpus=6,cores=2,threads=1,dies=1,sockets=3 \
    -cpu Icelake-Server-noTSX,enforce \
    -device pcie-root-port,id=pcie-root-port-1,port=0x1,addr=0x1.0x1,bus=pcie.0,chassis=2 \
    -device qemu-xhci,id=usb1,bus=pcie-root-port-1,addr=0x0 \
    -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
    -device pcie-root-port,id=pcie-root-port-2,port=0x2,addr=0x1.0x2,bus=pcie.0,chassis=3 \
    -device virtio-scsi-pci,id=virtio_scsi_pci0,bus=pcie-root-port-2,addr=0x0 \
    -blockdev node-name=file_image1,driver=file,auto-read-only=on,discard=unmap,aio=threads,filename=/home/rhel9.1-seabios.qcow2,cache.direct=on,cache.no-flush=off \
    -blockdev node-name=drive_image1,driver=qcow2,read-only=off,cache.direct=on,cache.no-flush=off,file=file_image1 \
    -device scsi-hd,id=image1,drive=drive_image1,write-cache=on \
    -device pcie-root-port,id=pcie-root-port-3,port=0x3,addr=0x1.0x3,bus=pcie.0,chassis=4 \
    -device virtio-net-pci,mac=9a:5d:b0:f5:04:0f,id=idlokhzs,netdev=id4YbMcO,bus=pcie-root-port-3,addr=0x0 \
    -netdev tap,id=id4YbMcO,vhost=on \
    -vnc :0 \
    -rtc base=utc,clock=host,driftfix=slew \
    -boot menu=off,order=cdn,once=c,strict=off \
    -enable-kvm \
    -monitor stdio \
    -S \
    -qmp tcp:0:4444,server=on,wait=off \
    -device pcie-root-port,id=pcie-root-port-4,port=0x4,addr=0x1.0x4,bus=pcie.0,chassis=5 \
    -blockdev node-name=file_stg1,driver=file,auto-read-only=on,discard=unmap,aio=threads,filename=/home/test.qcow2,cache.direct=on,cache.no-flush=off \
    -blockdev node-name=drive_stg1,driver=qcow2,read-only=off,cache.direct=on,cache.no-flush=off,file=file_stg1 \
    -device pcie-root-port,id=pcie-root-port-5,port=0x5,addr=0x1.0x5,bus=pcie.0,chassis=6 \