GabrielBrascher commented on pull request #4282:
URL: https://github.com/apache/cloudstack/pull/4282#issuecomment-856936171
@rhtyd we got it on a 4.15.0.0, but it seems that the codebase at 4.15.1.0
RC1 did not change at that point.
@shwstppr I think that it can happen with any hypervisor as long as one
migrate the VM, I saw this issue with KVM.
Steps to reproduce:
~~~
Case: migrate VM (e.g. for maintenance), keep VM stopped, try to migrate
back the VM -> NullPointer
1. Migrate VM from host A to host B
2. VM stills stopped at host B
3. Try to migrate VM back to host A
4. Null pointer
~~~
Stack trace:
```
java.lang.NullPointerException
at
com.cloud.vm.VirtualMachineManagerImpl.migrateThroughHypervisorOrStorage(VirtualMachineManagerImpl.java:2302)
at
com.cloud.vm.VirtualMachineManagerImpl.orchestrateStorageMigration(VirtualMachineManagerImpl.java:2194)
at
com.cloud.vm.VirtualMachineManagerImpl.orchestrateStorageMigration(VirtualMachineManagerImpl.java:5625)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
```
When checking the stack trace + DB it is possible to detect that the issue
is indeed caused by the fact of last `last_host_id` being null, as reported by
@RodrigoDLopez.
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