KVM: 0.731
files: 0.731
permissions: 0.710
performance: 0.695
other: 0.684
debug: 0.682
vnc: 0.680
device: 0.674
socket: 0.674
graphic: 0.667
boot: 0.659
network: 0.658
PID: 0.657
semantic: 0.656

Instance of QEMU doesn't unplug virtio scsi disk after device_del and drive_del commands

device_del and drive_del commands don't cause virtio disk detaching

Steps to reproduce:
1. Run instance

2. Attach virtio scsi disk

3. Reboot instance 

4. Immediately after reboot detach disk with QEMU commands:
device_del
drive_del

Expected result:
Disk should be detached anyway

Actual:
Domain info contains attached disk even after waiting long period of time(5 min in my case).

Additional info:
QEMU process:
root     29010 42.6  1.9 562036 61272 ?        Rl   03:42   0:01 /usr/bin/qemu-system-x86_64 -name instance-00000069 -S -machine pc-i440fx-trusty,accel=tcg,usb=off -m 64 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid d2418536-2547-4740-96b5-0d4f1d74b9f3 -smbios type=1,manufacturer=OpenStack Foundation,product=OpenStack Nova,version=13.0.0,serial=1fd8f69a-909b-4ed1-aae9-4fc9318fc622,uuid=d2418536-2547-4740-96b5-0d4f1d74b9f3,family=Virtual Machine -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-00000069.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -kernel /opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/kernel -initrd /opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/ramdisk -append root=/dev/vda console=tty0 console=ttyS0 no_timer_check -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/disk.config,if=none,id=drive-ide0-1-1,readonly=on,format=raw,cache=none -device ide-cd,bus=ide.1,unit=1,drive=drive-ide0-1-1,id=ide0-1-1 -netdev tap,fd=18,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:1a:10:3d,bus=pci.0,addr=0x3 -chardev file,id=charserial0,path=/opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/console.log -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -vnc 127.0.0.1:1 -k en-us -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

QEMU version:
qemu-system-x86_64 --version
QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.19), Copyright (c) 2003-2008 Fabrice Bellard

Maybe  you detach disk too fast.When you detach disk,the guest os maybe has not loaded the hotplug modules.So it can not detect your detach event.Can you test the situation when detaching  disk after guest os starting up ?

The QEMU project is currently considering to move its bug tracking to another system. For this we need to know which bugs are still valid and which could be closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state back to "New" within the next 60 days, otherwise this report will be marked as "Expired". Or mark it as "Fix Released" if the problem has been solved with a newer version of QEMU already. Thank you and sorry for the inconvenience.

[Expired for QEMU because there has been no activity for 60 days.]