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NPE observed when a externally managed kubernetes cluster is destoryed #14489
Description
problem
NPE observed when a externally managed kubernetes cluster is destoryed
versions
ACS 4.22.x, 4.23
The steps to reproduce the bug
- cmk create kubernetescluster name="test1" description="test1" zoneid=${ZONE_ID} networkid=${NETWORK_ID} clustertype=ExternalManaged
Note down the cks id
- Deploy 2 vm is the same network
cmk deploy virtualmachine networkids= zoneid= serviceofferingid= templateid=
- Add the vms to the cks cluster created
cmk add virtualmachinestokubernetescluster id=${CKS_ID} virtualmachineids=${VM_ID} iscontrolnode=true
cmk add virtualmachinestokubernetescluster id=${CKS_ID} virtualmachineids=${VM_ID}
- Destory the vms
destroy virtualmachine id=${VM_ID1} expunge=true
destroy virtualmachine id=${VM_ID1} expunge=true
- Delete the cks cluster > NPE observed
delete kubernetescluster id= expunge=true
2026-10-22 10:16:56,711 INFO [o.a.c.f.j.i.AsyncJobMonitor] (API-Job-Executor-95:[ctx-7f3da308, job-346]) (logid:1064cab8) Add job-346 into job monitoring
2026-10-22 10:16:56,713 DEBUG [c.c.a.ApiServlet] (qtp1151704483-212023:[ctx-7501e9cd, ctx-c81a67c1]) (logid:531c5ae8) ===END=== 10.0.3.251 -- POST
command=deleteKubernetesCluster
response=json
id=f97e9c7c-ffbb-407d-bbbc-280979925730
cleanup=true
expunge=true
sessionkey=s-GpdzR-qtu_71mZxAoNT1Rlkx0
2026-10-22 10:16:56,713 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl$5] (API-Job-Executor-95:[ctx-7f3da308, job-346]) (logid:b81d92c2) Executing AsyncJob {"accountId":2,"cmd":"org.apache.cloudstack.api.command.user.kubernetes.cluster.DeleteKubernetesClusterCmd","cmdInfo":"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","cmdVersion":0,"completeMsid":null,"created":null,"id":346,"initMsid":32989224371247,"instanceId":6,"instanceType":"KubernetesCluster","lastPolled":null,"lastUpdated":null,"processStatus":0,"removed":null,"result":null,"resultCode":0,"status":"IN_PROGRESS","userId":2,"uuid":"b81d92c2-e7ca-4cb8-8622-fca3dc183797"}
2026-10-22 10:16:56,743 ERROR [c.c.a.ApiAsyncJobDispatcher] (API-Job-Executor-95:[ctx-7f3da308, job-346]) (logid:b81d92c2) Unexpected exception while executing org.apache.cloudstack.api.command.user.kubernetes.cluster.DeleteKubernetesClusterCmd java.lang.NullPointerException: Cannot invoke "com.cloud.vm.VMInstanceVO.getBackupOfferingId()" because "vm" is null
at com.cloud.kubernetes.cluster.KubernetesClusterManagerImpl.checkIfVmsAssociatedWithBackupOffering(KubernetesClusterManagerImpl.java:2156)
at com.cloud.kubernetes.cluster.KubernetesClusterManagerImpl.deleteKubernetesCluster(KubernetesClusterManagerImpl.java:2128)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:569)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
What to do about it?
No NPE should be thrown when a external managed kubernetes cluster is destoryed
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