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CI: v1.18: Conformance Cluster Mesh (matrix 3): Unable to delete CEP: http2: client connection lost #40687

@YutaroHayakawa

Description

@YutaroHayakawa

CI failure

🟥 check-log-errors/no-errors-in-logs:pkg/endpointmanager:kind-cluster2-16456086659/kube-system/cilium-sdvbp (cilium-agent): Found 1 logs in kind-cluster2-16456086659/kube-system/cilium-sdvbp (cilium-agent) matching list of errors that must be investigated:
time=2025-07-22T21:41:14.20891755Z level=warn source=/go/src/github.com/cilium/cilium/pkg/endpointmanager/endpointsynchronizer.go:471 msg="Unable to delete CEP" k8sPodName=kube-system/coredns-674b8bbfcf-2h6xm datapathPolicyRevision=1 endpointID=345 containerID=8c9de24d6a ipv6=fd00:10:244:1::6078 identity=16762328 ciliumEndpointName=kube-system/coredns-674b8bbfcf-2h6xm ipv4=10.244.1.249 containerInterface="" desiredPolicyRevision=1 subsys=endpointsynchronizer controller="sync-to-k8s-ciliumendpoint (345)" error="Delete \"[https://172.18.0.7:6443/apis/cilium.io/v2/namespaces/kube-system/ciliumendpoints/coredns-674b8bbfcf-2h6xm\](https://172.18.0.7:6443/apis/cilium.io/v2/namespaces/kube-system/ciliumendpoints/coredns-674b8bbfcf-2h6xm/)": http2: client connection lost" (1 occurrences)
    ⛑️ The following owners are responsible for reliability of the testsuite: 
        - @cilium/committers (no-errors-in-logs:pkg/endpointmanager)
        - @cilium/ci-structure (.github/workflows/conformance-clustermesh.yaml)

Link: https://github.com/cilium/cilium/actions/runs/16456086659/job/46513383413
Sysdump: cilium-sysdump-3-20250722-215218.zip

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    area/CIContinuous Integration testing issue or flakeci/flakeThis is a known failure that occurs in the tree. Please investigate me!

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