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The cluster version will be initialized after the member becomes leader. The update is handled asynchronously. It couldn't be updated if the member has been closed and the go-runtime picks the `s.stopping` channel first. ```go //e2a5df534c/server/etcdserver/server.go (L2170)func (s *EtcdServer) monitorClusterVersions() { ... for { select { case <-s.firstCommitInTerm.Receive(): case <-time.After(monitorVersionInterval): case <-s.stopping: return } ... } } ``` Or after the `s.stopping` has been closed, the [UpdateClusterVersion][1] won't file GoAttach successfully. For the #15409, we can see the warn log `server has stopped; skipping GoAttach` from GoAttach: ```plain https://github.com/etcd-io/etcd/actions/runs/4340931587/jobs/7580103902 logger.go:130: 2023-03-06T07:36:44.253Z WARN default stopping grpc server due to error {"error": "accept tcp 127.0.0.1:2379: use of closed network connection"} logger.go:130: 2023-03-06T07:36:44.253Z WARN default stopped grpc server due to error {"error": "accept tcp 127.0.0.1:2379: use of closed network connection"} logger.go:130: 2023-03-06T07:36:44.253Z ERROR default setting up serving from embedded etcd failed. {"error": "accept tcp 127.0.0.1:2379: use of closed network connection"} logger.go:130: 2023-03-06T07:36:44.253Z ERROR default setting up serving from embedded etcd failed. {"error": "http: Server closed"} logger.go:130: 2023-03-06T07:36:44.253Z INFO default skipped leadership transfer for single voting member cluster {"local-member-id": "8e9e05c52164694d", "current-leader-member-id": "8e9e05c52164694d"} logger.go:130: 2023-03-06T07:36:44.253Z WARN default server has stopped; skipping GoAttach ... ``` If the cluster version isn't updated, the minimum storage version will be v3.5 because the [AuthStatus][2] is introduced in [v3.5][3]. The compare will fail. To fix this issue, we should wait for cluster version to become ready after server is ready to serve request. [1]: <e2a5df534c/server/etcdserver/adapters.go (L45)> [2]: <071e70cdc4> [3]: <1b4e54c238> Signed-off-by: Wei Fu <fuweid89@gmail.com>