We are seeing a strange problem in our ACS environments. We are running
Centos7 as our hypervisors. When we take a VM Snapshot and then later revert
to it, it works as long as we haven't stopped and started the VM. If we stop
the VM and start it again - even if it is still on the same host - we cannot
revert back to a VM Snapshot. Here is the error and further information. Any
ideas? It is 100% reproducible for us.
2021-12-13 22:50:51,731 DEBUG [c.c.a.t.Request] (AgentManager-Handler-12:null)
(logid:) Seq 101-5603885311332466879: Processing: { Ans: , MgmtId:
345051498372, via: 101, Ver: v1, Flags: 10,
[{"com.cloud.agent.api.RevertToVMSnapshotAnswer":{"result":false,"details":"
Revert to VM snapshot failed due to org.libvirt.LibvirtException: revert
requires force: Target CPU feature count 3 does not match source 0","wait":0}}]
}
2021-12-13 22:50:51,732 ERROR [o.a.c.s.v.DefaultVMSnapshotStrategy]
(Work-Job-Executor-64:ctx-1767fb85 job-130106/job-130111 ctx-ab4680c7)
(logid:87cc475a) Revert VM: i-2-317-VM to snapshot:
i-2-317-VM_VS_20211213224802 failed due to Revert to VM snapshot failed due to
org.libvirt.LibvirtException: revert requires force: Target CPU feature count 3
does not match source 0
com.cloud.utils.exception.CloudRuntimeException: Revert VM: i-2-317-VM to
snapshot: i-2-317-VM_VS_20211213224802 failed due to Revert to VM snapshot
failed due to org.libvirt.LibvirtException: revert requires force: Target CPU
feature count 3 does not match source 0
2021-12-13 22:50:51,743 ERROR [c.c.v.VmWorkJobHandlerProxy]
(Work-Job-Executor-64:ctx-1767fb85 job-130106/job-130111 ctx-ab4680c7)
(logid:87cc475a) Invocation exception, caused by:
com.cloud.utils.exception.CloudRuntimeException: Revert VM: i-2-317-VM to
snapshot: i-2-317-VM_VS_20211213224802 failed due to Revert to VM snapshot
failed due to org.libvirt.LibvirtException: revert requires force: Target CPU
feature count 3 does not match source 0
2021-12-13 22:50:51,743 INFO [c.c.v.VmWorkJobHandlerProxy]
(Work-Job-Executor-64:ctx-1767fb85 job-130106/job-130111 ctx-ab4680c7)
(logid:87cc475a) Rethrow exception
com.cloud.utils.exception.CloudRuntimeException: Revert VM: i-2-317-VM to
snapshot: i-2-317-VM_VS_20211213224802 failed due to Revert to VM snapshot
failed due to org.libvirt.LibvirtException: revert requires force: Target CPU
feature count 3 does not match source 0
com.cloud.utils.exception.CloudRuntimeException: Revert VM: i-2-317-VM to
snapshot: i-2-317-VM_VS_20211213224802 failed due to Revert to VM snapshot
failed due to org.libvirt.LibvirtException: revert requires force: Target CPU
feature count 3 does not match source 0
Caused by: com.cloud.utils.exception.CloudRuntimeException: Revert VM:
i-2-317-VM to snapshot: i-2-317-VM_VS_20211213224802 failed due to Revert to
VM snapshot failed due to org.libvirt.LibvirtException: revert requires force:
Target CPU feature count 3 does not match source 0
[root@labcloudkvm02 ~]# virsh dumpxml 33
...
<cpu mode='custom' match='exact' check='full'>
<model fallback='forbid'>IvyBridge</model>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='arat'/>
<feature policy='require' name='xsaveopt'/>
</cpu>
...
[root@labcloudkvm02 ~]# virsh dumpxml 33 --migratable
...
<cpu mode='custom' match='exact' check='partial'>
<model fallback='forbid'>IvyBridge</model>
</cpu>
...
[root@labcloudkvm02 ~]# virsh snapshot-dumpxml 33 i-2-317-VM_VS_20211213224802
...
<cpu mode='custom' match='exact' check='full'>
<model fallback='forbid'>IvyBridge</model>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='arat'/>
<feature policy='require' name='xsaveopt'/>
</cpu>
...
In agent.properties:
guest.cpu.model=IvyBridge
guest.cpu.mode=custom
