Somehow libvirt (virsh) is not checking the block-job execution:
<while the first "virsh blockcommit" is stuck, I can do this...>
inaddy@(kvm02):~$ virsh qemu-monitor-command guest --pretty -- '{ "execute":
"query-block-jobs" }'
{
"return": [
{
"io-status": "ok",
"device": "drive-virtio-disk0",
"busy": false,
"len": 32212254720,
"offset": 32212254720,
"paused": false,
"speed": 0,
"type": "commit"
}
],
"id": "libvirt-511"
}
inaddy@(kvm02):~$ virsh blockjob guest /var/lib/libvirt/images/guest.1487158333
Block Commit: [100 %]
With "query-block-jobs" you can see if it finished (offset - len = 0).
Virsh is not doing this, so I have to finish the job by hand:
inaddy@(kvm02):~$ virsh qemu-monitor-command guest --pretty -- '{ "execute":
"block-job-complete", "arguments": { "device": "drive-virtio-disk0" } }'
{
"return": {
},
"id": "libvirt-859"
}
And the command returns:
inaddy@(kvm02):~$ virsh blockcommit --domain guest vda --base
/var/lib/libvirt/images/guest.qcow2 --top
/var/lib/libvirt/images/guest.1487158333 --wait --verbose
Block Commit: [100 %]
Commit complete
Problem is that QEMU has the correct answer for the backing file:
inaddy@(kvm02):~$ virsh qemu-monitor-command guest --pretty -- '{ "execute":
"query-block" }'
{
"return": [
{
"io-status": "ok",
"device": "drive-virtio-disk0",
"locked": false,
"removable": false,
"inserted": {
"iops_rd": 0,
"image": {
"virtual-size": 32212254720,
"filename": "/var/lib/libvirt/images/guest.qcow2",
"cluster-size": 65536,
"format": "qcow2",
"actual-size": 5328867328,
"format-specific": {
"type": "qcow2",
"data": {
"compat": "1.1",
"lazy-refcounts": false
}
},
"dirty-flag": false
},
"iops_wr": 0,
"ro": false,
"backing_file_depth": 0,
"drv": "qcow2",
"iops": 0,
"bps_wr": 0,
"encrypted": false,
"bps": 0,
"bps_rd": 0,
"file": "/var/lib/libvirt/images/guest.qcow2",
"encryption_key_missing": false
},
"type": "unknown"
},
{
"io-status": "ok",
"device": "drive-ide0-0-0",
"locked": false,
"removable": true,
"tray_open": false,
"type": "unknown"
}
],
"id": "libvirt-861"
}
But libvirt still thinks its using the old un-merged snapshot:
inaddy@(kvm02):~$ virsh domblklist --domain guest
Target Source
------------------------------------------------
vda /var/lib/libvirt/images/guest.1487158333
hda -
Will work on libvirt to fix this....
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https://bugs.launchpad.net/bugs/1317491
Title:
virsh blockcommit hangs at 100%
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