[libvirt] Reproducible live disk detach bug
Hey guys,
I am currently running into a reproducible libvirt bug when I detach a
disk from a running VM using libvirt 1.2.18 and qemu 2.3.0.
I can attach a disk to a running VM without any problems.
During the attach operation I don't create a disk alias name, which
results in libvirt generating an unique alias.
Using virsh dumpxml I get the following output(snippet):
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/var/local/mnt/test-storage/test-storage.raw'/>
<backingStore/>
<target dev='vde' bus='virtio'/>
<iotune>
<read_bytes_sec>94371840</read_bytes_sec>
<write_bytes_sec>31457280</write_bytes_sec>
<read_iops_sec>1000</read_iops_sec>
<write_iops_sec>200</write_iops_sec>
</iotune>
<alias name='virtio-disk4'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x09' function='0x0'/>
</disk>
As you can see, libvirt generates 'virtio-disk4' as an alias. But as
soon as I try to detach the disk from the running VM, I will receive the
following two errors in my libvirt log:
2015-08-06 10:48:59.943+0000: 11657: warning :
qemuMonitorJSONHandleDeviceDeleted:939 : missing device in device
deleted event
2015-08-06 10:48:59.945+0000: 11662: error :
qemuMonitorTextDriveDel:2594 : operation failed: deleting
drive-virtio-disk4 drive failed: 2015-08-06T10:48:59.945058Z Device
'drive-virtio-disk4' not found
Apparently libvirt tries to detach the disk with a drive- prefix, which
doesn't exist? The drive seems to detach correctly though.
I hope somebody with more extensive knowledge about libvirt can help me
solve this issue. If more information is needed, feel free to contact me.
Thanks,
Frank