kubernetes: [Flaky Test] ci-kubernetes-e2e-aks-engine-azure-master-windows-containerd CNI failed to parse json

Which jobs are flaking:

ci-kubernetes-e2e-aks-engine-azure-master-windows-containerd

Which test(s) are flaking:

several

Testgrid link:

https://testgrid.k8s.io/sig-windows-releases#aks-engine-azure-windows-master-containerd

Reason for failure:

CNI failed:

Jan 29 06:41:25.617: INFO: At 2021-01-29 06:36:50 +0000 UTC - event for webserver-deployment-5575796f8f-k92dd: {kubelet 2884k8s001} Started: Started container httpd
Jan 29 06:41:25.617: INFO: At 2021-01-29 06:37:08 +0000 UTC - event for webserver-deployment-5575796f8f-9jj9z: {kubelet 2884k8s000} FailedCreatePodSandBox: Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "678fa65619f0dd4c0434d2b4e510bd99930bc62e8ea4b64ea8a5f79a73b20f6a": unexpected end of JSON input
Jan 29 06:41:25.617: INFO: At 2021-01-29 06:37:10 +0000 UTC - event for webserver-deployment-5575796f8f-6rbcl: {kubelet 2884k8s000} FailedCreatePodSandBox: Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "cb4c4d0e705d57ac9da1eae9a42e2bb421dca03484fa8e0260672425feb55f15": unexpected end of JSON input
Jan 29 06:41:25.617: INFO: At 2021-01-29 06:37:10 +0000 UTC - event for webserver-deployment-5575796f8f-dtc4x: {kubelet 2884k8s000} FailedCreatePodSandBox: Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "a20980651ba231f652be02984d594aa661c613d440b8dd740d4073f2bfa4d50b": unexpected end of JSON input
Jan 29 06:41:25.617: INFO: At 2021-01-29 06:37:10 +0000 UTC - event for webserver-deployment-5575796f8f-jjdlr: {kubelet 2884k8s000} FailedCreatePodSandBox: Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "ba151015cc98dd643d424bf2eafaa71855fb4fb6b75fbb24bb4ea2616f964faf": unexpected end of JSON input
Jan 29 06:41:25.617: INFO: At 2021-01-29 06:37:10 +0000 UTC - event for webserver-deployment-5575796f8f-pst6x: {kubelet 2884k8s000} FailedCreatePodSandBox: Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "5f40817e69457ddc2b907adfd182969bea93f24e337c84675d578aaeb17d2eb1": unexpected end of JSON input

Containerd failed to create the pod:

E0129 06:38:50.213490    4316 remote_runtime.go:251] StartContainer "1054e8a1180749dbb37097a5f985003ca3afb2036099f5df05020a5a9053a4ac" from runtime service failed: rpc error: code = Unknown desc = failed to create containerd task: hcsshim::CreateComputeSystem 1054e8a1180749dbb37097a5f985003ca3afb2036099f5df05020a5a9053a4ac: context deadline exceeded
(extra info: {"Owner":"containerd-shim-runhcs-v1.exe","SchemaVersion":{"Major":2,"Minor":1},"Container":{"GuestOs":{"HostName":"pod-adoption"},"Storage":{"Layers":[{"Id":"7b371bd9-de2e-5dc3-ae86-4d3d0378f6c6","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\113"},{"Id":"d83ac863-b163-5ceb-95c5-ac65bf7a39e3","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\112"},{"Id":"fd86a0ef-4ae8-5be6-b6bd-9e46685ad393","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\110"},{"Id":"9b944c46-c035-5757-9412-5fecc883941a","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\109"},{"Id":"9dee6370-72a7-5b65-af00-e08eeeaa1ef7","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\108"},{"Id":"77c8d266-544f-5418-b4e9-f49715060db9","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\107"},{"Id":"fa4d9b3a-212e-5b70-a9e6-bb1412fd1e53","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\106"},{"Id":"cc368b4b-70a7-5da3-aff7-b91d843db78a","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\105"},{"Id":"b7023ad6-4285-5a05-8998-e1c9c6bc6e49","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\104"},{"Id":"9c171b78-a39b-5e34-873e-04ab1b164bb7","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\79"},{"Id":"75b3f965-edc8-5443-ac0b-77f329589f05","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\78"},{"Id":"bc445432-f548-5054-b865-43ca4d3a32af","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\77"},{"Id":"e1a4a38f-7885-56a7-898b-96c1ceaf5cd5","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\76"},{"Id":"51c30dea-6447-5859-a549-0801b0fbf76c","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\75"},{"Id":"defbcf4b-cdf1-5e89-8198-0fe14410cffc","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\74"},{"Id":"b4e8aa06-2c0c-5738-80d8-af374eba772e","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\73"},{"Id":"59bb3c04-8829-58cb-ab1c-0aef684466cf","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\72"},{"Id":"a2ee96d5-66f6-5a9b-b0d4-384112c9e269","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\71"},{"Id":"2f347625-13a3-5633-badb-6868ea928ff9","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\70"},{"Id":"b03a06fa-412f-5917-a1f1-657de8a3bcc3","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\69"},{"Id":"83621030-7522-570b-ab7c-cf9c5898f09c","Path":"C:\\ProgramData\\containerd\\root\\io.containerd.snapshotter.v1.windows\\snapshots\\62"}],"Path":"\\\\?\\Volume{f8cd70db-970c-40de-aaaf-c07998d35301}\\"},"MappedDirectories":[{"HostPath":"c:\\var\\lib\\kubelet\\pods\\8cacd155-a5f4-4c8a-b73c-9d3eb47469be\\containers\\pod-adoption\\c6e401e7","ContainerPath":"c:\\dev\\termination-log"},{"HostPath":"c:\\var\\lib\\kubelet\\pods\\8cacd155-a5f4-4c8a-b73c-9d3eb47469be\\volumes\\kubernetes.io~secret\\default-token-tmjhm","ContainerPath":"c:\\var\\run\\secrets\\kubernetes.io\\serviceaccount","ReadOnly":true}],"Networking":{"Namespace":"36666c6e-cdde-4370-bfd1-a36911baa06a"}},"ShouldTerminateOnLastHandleClosed":true}): unknown

Anything else we need to know:

• links to go.k8s.io/triage appreciated
• links to specific failures in spyglass appreciated

https://prow.k8s.io/view/gcs/kubernetes-jenkins/logs/ci-kubernetes-e2e-aks-engine-azure-master-windows-containerd/1355027170874888192

/sig windows