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  1. OpenShift Bugs
  2. OCPBUGS-31467

az.EnsureHostInPool panic when Azure VM instance not found

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      * Previously, if a virtual machine (VM) was deleted and the network interface controller (NIC) still existed for that VM, the {azure-first} VM verification check failed. With this release, the verification check can now handle this situation by gracefully processing the issue without failing. (link:https://issues.redhat.com/browse/OCPBUGS-31467[*OCPBUGS-31467*])
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      * Previously, if a virtual machine (VM) was deleted and the network interface controller (NIC) still existed for that VM, the {azure-first} VM verification check failed. With this release, the verification check can now handle this situation by gracefully processing the issue without failing. (link: https://issues.redhat.com/browse/OCPBUGS-31467 [* OCPBUGS-31467 *])
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      Description of problem:

          on Azure, when kube-controller-manager verify whether a machine exists or not, if the machine was already deleted, the code may panic with sigsegv

I0320 12:02:55.806321       1 azure_backoff.go:91] GetVirtualMachineWithRetry(worker-e32ads-westeurope2-f72dr): backoff success
I0320 12:02:56.028287       1 azure_wrap.go:201] Virtual machine "worker-e16as-westeurope1-hpz2t" is under deleting
I0320 12:02:56.028328       1 azure_standard.go:752] GetPrimaryInterface(worker-e16as-westeurope1-hpz2t, ) abort backoff
E0320 12:02:56.028334       1 azure_standard.go:825] error: az.EnsureHostInPool(worker-e16as-westeurope1-hpz2t), az.VMSet.GetPrimaryInterface.Get(worker-e16as-westeurope1-hpz2t, ), err=instance not found
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x60 pc=0x33d21f6]goroutine 240642 [running]:
k8s.io/legacy-cloud-providers/azure.(*availabilitySet).EnsureHostInPool(0xc000016580, 0xc0262fb400, {0xc02d8a5080, 0x32}, {0xc021c1bc70, 0xc4}, {0x0, 0x0}, 0xa8?)
        vendor/k8s.io/legacy-cloud-providers/azure/azure_standard.go:831 +0x4f6
k8s.io/legacy-cloud-providers/azure.(*availabilitySet).EnsureHostsInPool.func2()
        vendor/k8s.io/legacy-cloud-providers/azure/azure_standard.go:928 +0x5f
k8s.io/apimachinery/pkg/util/errors.AggregateGoroutines.func1(0xc0159d0788?)

      Version-Release number of selected component (if applicable):

          4.12.48

      (ships https://github.com/openshift/kubernetes/commit/6df21776c7879727ab53895df8a03e53fb725d74)
      issue introduced by https://github.com/kubernetes/kubernetes/pull/111428/files#diff-0414c3aba906b2c0cdb2f09da32bd45c6bf1df71cbb2fc55950743c99a4a5fe4

      How reproducible:

          was unable to reproduce, happens occasionally

      Steps to Reproduce:

          1.
    2.
    3.

      Actual results:

          panic

      Expected results:

          no panic

      Additional info:

          internal case 03772590

              rh-ee-nbrubake Nolan Brubaker
              frigault Francois Rigault
              Zhaohua Sun Zhaohua Sun
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                Created:
                Updated:
                Resolved: