Hello,

we have upgrade one of our oVirt engines to 4.2.1 (from 4.1.9) and afterwards all nodes too. The cluster compatibility level has been set to 4.2.

Now we can't start a VM after it has been powered off. The only hint we found in engine.log is:

2018-03-07 14:51:52,504+01 INFO [org.ovirt.engine.core.vdsbroker.UpdateVmDynamicDataVDSCommand] (EE-ManagedThreadFactory-engine-Thread-25) [f855b54a-56d9-4708-8a67-5609438ddadb] START, UpdateVmDynamicDataVDSCommand( UpdateVmDynamicDataVDSCommandParameters:{hostId='null', vmId='a7bc4124-06cb-4909-9389-bcf727df1304', vmDynamic='org.ovirt.engine.core.common.businessentities.VmDynamic@491983e9'}), log id: 7d49849e 2018-03-07 14:51:52,509+01 INFO [org.ovirt.engine.core.vdsbroker.UpdateVmDynamicDataVDSCommand] (EE-ManagedThreadFactory-engine-Thread-25) [f855b54a-56d9-4708-8a67-5609438ddadb] FINISH, UpdateVmDynamicDataVDSCommand, log id: 7d49849e 2018-03-07 14:51:52,531+01 INFO [org.ovirt.engine.core.vdsbroker.CreateVDSCommand] (EE-ManagedThreadFactory-engine-Thread-25) [f855b54a-56d9-4708-8a67-5609438ddadb] START, CreateVDSCommand( CreateVDSCommandParameters:{hostId='0add031e-c72f-473f-ab2f-4f7abd1f402b', vmId='a7bc4124-06cb-4909-9389-bcf727df1304', vm='VM [prod-hub-201]'}), log id: 4af1f227 2018-03-07 14:51:52,533+01 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.CreateBrokerVDSCommand] (EE-ManagedThreadFactory-engine-Thread-25) [f855b54a-56d9-4708-8a67-5609438ddadb] START, CreateBrokerVDSCommand(HostName = prod-node-210, CreateVDSCommandParameters:{hostId='0add031e-c72f-473f-ab2f-4f7abd1f402b', vmId='a7bc4124-06cb-4909-9389-bcf727df1304', vm='VM [prod-hub-201]'}), log id: 71dcc8e7 2018-03-07 14:51:52,545+01 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.CreateBrokerVDSCommand] (EE-ManagedThreadFactory-engine-Thread-25) [f855b54a-56d9-4708-8a67-5609438ddadb] Failed in 'CreateBrokerVDS' method, for vds: 'prod-node-210'; host: 'prod-node-210': null 2018-03-07 14:51:52,546+01 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.CreateBrokerVDSCommand] (EE-ManagedThreadFactory-engine-Thread-25) [f855b54a-56d9-4708-8a67-5609438ddadb] Command 'CreateBrokerVDSCommand(HostName = prod-node-210, CreateVDSCommandParameters:{hostId='0add031e-c72f-473f-ab2f-4f7abd1f402b', vmId='a7bc4124-06cb-4909-9389-bcf727df1304', vm='VM
[prod-hub-201]'})' execution failed: null
2018-03-07 14:51:52,546+01 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.CreateBrokerVDSCommand] (EE-ManagedThreadFactory-engine-Thread-25) [f855b54a-56d9-4708-8a67-5609438ddadb] FINISH, CreateBrokerVDSCommand, log id: 71dcc8e7 2018-03-07 14:51:52,546+01 ERROR [org.ovirt.engine.core.vdsbroker.CreateVDSCommand] (EE-ManagedThreadFactory-engine-Thread-25) [f855b5 4a-56d9-4708-8a67-5609438ddadb] Failed to create VM: java.lang.NullPointerException at org.ovirt.engine.core.vdsbroker.builder.vminfo.LibvirtVmXmlBuilder.lambda$writeInterfaces$23(LibvirtVmXmlBuilder.java:1066)
 [vdsbroker.jar:]

[...]

But this doesn't lead us to the root cause. I haven't found any matching bug tickets in release notes for upcoming 4.2.1. Can anyone help here?

Kind regards

Jan Siml
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