When using kubernetes and nydus，container failed to start with an error “target snapshot already exists”

[cl0udee]

Additional Information

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Version of nydus being used (nydusd --version)

Version: 	v2.1.1
Git Commit: 	2fd7070bf7c08ba8667a375ecf5ab4ca3963a184
Build Time: 	2022-11-06T11:14:20.450697142Z
Profile: 	release
Rustc: 		rustc 1.61.0 (fe5b13d68 2022-05-18)

Version of nydus-snapshotter being used (containerd-nydus-grpc --version)

Version:     v0.4.0
Revision:    1e18acbf9d39588d39d0276a423e33ebeeb3462b
Go version:  go1.18.6
Build time:  2022-11-30T11:40:06

Kernel information (uname -r)

4.19.90-2102.2.0.0062.ctl2.x86_64

GNU/Linux Distribution, if applicable (cat /etc/os-release)

command result: cat /etc/os-release

containerd-nydus-grpc command line used, if applicable (ps aux | grep containerd-nydus-grpc)

/usr/bin/containerd-nydus-grpc --config-path /etc/nydus/nydusd-config.json --address /run/containerd/containerd-nydus-grpc.sock --nydusd-path /usr/bin/nydusd --nydusimg-path /usr/bin/nydus-image --log-to-stdout

client command line used, if applicable (such as: nerdctl, docker, kubectl, ctr)

kubectl apply -f test-pod.yaml

Screenshots (if applicable)

Details about issue

When I use nerdctl, such as

nerdctl --snapshotter nydus run --rm -it centos:v1 bash

the container can be successfully created and run normally. However, when I switch to Kubernetes, it gives me the following error:

Warning  FailedCreatePodSandBox  <invalid>  kubelet  Failed to create pod sandbox: rpc error: code = AlreadyExists desc = failed to get sandbox image "xxx/pause:3.6": failed to pull image "xxx/pause:3.6": failed to pull and unpack image "xxx/pause:3.6": unable to prepare extraction snapshot: target snapshot "sha256:xxx": already exists

I suspect this issue is related to the pause image because nerdctl, which doesn't involve the pause image, can start successfully. I have also tried using

ctr -n k8s.io content fetch $pause-image-name

but it doesn't work.

This is very confusing for me, especially because I was able to successfully launch pods using Kubernetes a while ago. However, after some time has passed, it is no longer able to start.

[imeoer]

Cloud you try ctr images delete xxx/pause:3.6 --sync ?

[imeoer]

Cloud you try ctr images delete xxx/pause:3.6 --sync ?

Need to ensure the pod using the image has been deleted first.

[cl0udee]

Cloud you try ctr images delete xxx/pause:3.6 --sync ?

Need to ensure the pod using the image has been deleted first.

I have already deleted all the pause images, but I still receive the same error. target snapshot "sha256:xxx": already exists

[kinderyj]

Is this a work in progress (WIP)? I'm experiencing the same issue in kata 3.2.0. @imeoer

[imeoer]

This appears to be an inconsistency in containerd snapshot metadata, try the following commands:

ctr -n k8s.io content ls | grep sha256:xxx ctr -n k8s.io content rm $blob_id

But we still don't have an way to reproduce it.