{"record":{"id":"b732cce91c423968","repo":"flipped-aurora/gin-vue-admin","slug":"mcp-w-b732cc","errorCode":null,"errorMessage":"停用 MCP 独立服务失败: %w","messagePattern":"停用 MCP 独立服务失败: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/mcp/standalone_manager.go","lineNumber":212,"sourceCode":"\t\treturn GetManagedStandaloneStatus(context.Background()), err\n\t}\n\n\treturn waitForManagedProcess(ctx, meta)\n}\n\nfunc StopManagedStandalone(ctx context.Context) (ManagedStandaloneStatus, error) {\n\tmeta, err := readManagedProcessMeta()\n\tif err != nil {\n\t\tstatus := GetManagedStandaloneStatus(ctx)\n\t\tif status.Reachable {\n\t\t\treturn status, errors.New(\"当前 MCP 服务不是由页面启动的，无法自动停用\")\n\t\t}\n\t\treturn status, nil\n\t}\n\n\tif meta.PID > 0 && processExists(meta.PID) {\n\t\tif err := terminateProcess(meta.PID); err != nil {\n\t\t\treturn GetManagedStandaloneStatus(context.Background()), fmt.Errorf(\"停用 MCP 独立服务失败: %w\", err)\n\t\t}\n\t}\n\n\tdeadline := time.NewTimer(mcpStopWaitTimeout)\n\tticker := time.NewTicker(200 * time.Millisecond)\n\tdefer deadline.Stop()\n\tdefer ticker.Stop()\n\n\tfor {\n\t\tselect {\n\t\tcase <-ctx.Done():\n\t\t\treturn GetManagedStandaloneStatus(context.Background()), ctx.Err()\n\t\tcase <-deadline.C:\n\t\t\t_ = removeManagedProcessMeta()\n\t\t\treturn GetManagedStandaloneStatus(context.Background()), nil\n\t\tcase <-ticker.C:\n\t\t\tif meta.PID <= 0 || !processExists(meta.PID) {\n\t\t\t\t_ = removeManagedProcessMeta()","sourceCodeStart":194,"sourceCodeEnd":230,"githubUrl":"https://github.com/flipped-aurora/gin-vue-admin/blob/3136500ef380842b0eb6c4daa87c3f8a47fcf9e0/server/mcp/standalone_manager.go#L194-L230","documentation":"Thrown by StopManagedStandalone when terminateProcess(meta.PID) fails to signal/kill the managed MCP standalone process. The manager knows the recorded PID exists but could not terminate it (e.g. permission or already-reaped edge cases).","triggerScenarios":"Stopping the managed standalone while terminateProcess returns an error: process owned by another user (started under different identity), PID reused by an unrelated process the caller cannot signal, or the kill syscall fails for OS reasons.","commonSituations":"MCP process was started by a different user or via sudo; container restricts signals across PIDs; stale meta with a recycled PID; Windows/Linux permission differences.","solutions":["Check the wrapped cause: 'operation not permitted' usually means ownership mismatch — stop the process as the same user that started it.","Kill the PID manually (kill <pid>) and re-run StopManagedStandalone; the manager reconciles status via GetManagedStandaloneStatus.","Delete/clean stale managed-process metadata if the PID was reused, then start fresh.","Verify in the log file whether the process is actually healthy/running and what it is doing (stuck children may need process-group kill)."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// confirm we can signal the PID before attempting stop\nif err := syscall.Kill(meta.PID, 0); err != nil {\n    return fmt.Errorf(\"cannot signal pid %d as this user: %w\", meta.PID, err)\n}","typeGuard":null,"tryCatchPattern":"status, err := StopManagedStandalone(ctx)\nif err != nil && strings.Contains(err.Error(), \"operation not permitted\") {\n    // fallback: escalate or ask the owning user to stop it\n    log.Printf(\"manual intervention required for pid %d\", meta.PID)\n}","preventionTips":["Always start and stop the managed process under the same OS user.","Avoid sudo-mixing for the MCP lifecycle.","Clean up stale managed-process metadata if PIDs may be recycled.","Test stop/start cycles in staging, including crash-then-stop scenarios."],"tags":["process","signal","mcp","terminate-failure"],"backgroundTag":"process-terminate-failed","analyzedSha":"3136500ef380842b0eb6c4daa87c3f8a47fcf9e0","analyzedAt":"2026-08-31T13:50:02.721Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}