{"record":{"id":"e400a56a5d606007","repo":"k3s-io/k3s","slug":"failed-to-find-s-cgroup-v2","errorCode":null,"errorMessage":"failed to find %s cgroup (v2)","messagePattern":"failed to find (.+?) cgroup \\(v2\\)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/cgroups/cgroups_linux.go","lineNumber":70,"sourceCode":"\treturn nil\n}\n\nfunc validateCgroupsV2() error {\n\tmanager, err := cgroupsv2.NewManager(\"/sys/fs/cgroup\", \"/\", &cgroupsv2.Resources{})\n\tif err != nil {\n\t\treturn err\n\t}\n\tcontrollers, err := manager.RootControllers()\n\tif err != nil {\n\t\treturn err\n\t}\n\tm := make(map[string]struct{})\n\tfor _, controller := range controllers {\n\t\tm[controller] = struct{}{}\n\t}\n\tfor _, controller := range []string{\"cpu\", \"cpuset\", \"memory\"} {\n\t\tif _, ok := m[controller]; !ok {\n\t\t\treturn fmt.Errorf(\"failed to find %s cgroup (v2)\", controller)\n\t\t}\n\t}\n\treturn nil\n}\n\nfunc CheckCgroups() (kubeletRoot, runtimeRoot string, controllers map[string]bool) {\n\tcgroupsModeV2 := cgroups.Mode() == cgroups.Unified\n\tcontrollers = make(map[string]bool)\n\n\t// For Unified (v2) cgroups we can directly check to see what controllers are mounted\n\t// under the unified hierarchy.\n\tif cgroupsModeV2 {\n\t\tm, err := cgroupsv2.NewManager(\"/sys/fs/cgroup\", \"/\", &cgroupsv2.Resources{})\n\t\tif err != nil {\n\t\t\treturn kubeletRoot, runtimeRoot, controllers\n\t\t}\n\t\tenabledControllers, err := m.Controllers()\n\t\tif err != nil {","sourceCodeStart":52,"sourceCodeEnd":88,"githubUrl":"https://github.com/k3s-io/k3s/blob/6ba341e396edc16b8dcae978a7c5e3ac7ee5606e/pkg/cgroups/cgroups_linux.go#L52-L88","documentation":"Error \"failed to find %s cgroup (v2)\" thrown in k3s-io/k3s.","triggerScenarios":"Thrown at pkg/cgroups/cgroups_linux.go:70 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"6ba341e396edc16b8dcae978a7c5e3ac7ee5606e","analyzedAt":"2026-08-15T16:27:54.286Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}