Problem: live-migrating a VM, the migration will complete but cause a VM to 
become unstable.  The VM may become unreachable on the network, or go through a 
cycle where it hangs for ~10 mins at a time. A hard-reboot is the only way to 
resolve this.


Related libvirt logs:

2015-03-30 01:18:23.429+0000: 244411: warning : 
qemuMigrationCancelDriveMirror:1383 : Unable to stop block job on 
drive-virtio-disk0

2015-03-30 01:17:41.899+0000: 244408: warning : 
qemuDomainObjEnterMonitorInternal:1175 : This thread seems to be the async job 
owner; entering monitor without asking for a nested job is dangerous

Nova env:
Kernel : 3.11.0-26-generic

libvirt-bin : 1.1.1-0ubuntu11

ceph-common : 0.67.9-1precise


Ceph:

Kernel: 3.13.0-36-generic

ceph        : 0.80.7-1precise

ceph-common : 0.80.7-1precise



Saw post here (https://bugs.dogfood.paddev.net/mos/+bug/1371130) that this 
might have something to do the libvirt migration with RBD image, but exactly 
how Ceph is related and how to resovle it if anyone had this before.


Thanks.


— Yuming
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