{"record":{"id":"57bc80c11b97b59c","repo":"vxcontrol/pentagi","slug":"failed-to-inspect-file-check-exec-w","errorCode":null,"errorMessage":"failed to inspect file-check exec: %w","messagePattern":"failed to inspect file-check exec: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"backend/pkg/tools/tools.go","lineNumber":676,"sourceCode":"\t\tAttachStdout: true,\n\t\tAttachStderr: true,\n\t})\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to create file-check exec: %w\", err)\n\t}\n\n\tresp, err := fte.docker.ContainerExecAttach(ctx, createResp.ID, client.ExecAttachOptions{})\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to attach file-check exec: %w\", err)\n\t}\n\toutput, readErr := io.ReadAll(resp.Reader)\n\tresp.Close()\n\tif readErr != nil {\n\t\treturn nil, fmt.Errorf(\"failed to read file-check output: %w\", readErr)\n\t}\n\tinspect, err := fte.docker.ContainerExecInspect(ctx, createResp.ID)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to inspect file-check exec: %w\", err)\n\t}\n\tif inspect.ExitCode != 0 {\n\t\treturn nil, fmt.Errorf(\"file-check exec failed with exit code %d: %s\", inspect.ExitCode, strings.TrimSpace(string(output)))\n\t}\n\n\tbyContainerPath := make(map[string]fileSyncEntry, len(entries))\n\tfor _, e := range entries {\n\t\tbyContainerPath[e.containerPath] = e\n\t}\n\n\tvar missing []fileSyncEntry\n\tfor _, line := range strings.Split(string(output), \"\\n\") {\n\t\tline = strings.TrimSpace(line)\n\t\tif line == \"\" {\n\t\t\tcontinue\n\t\t}\n\t\tif e, ok := byContainerPath[line]; ok {\n\t\t\tmissing = append(missing, e)","sourceCodeStart":658,"sourceCodeEnd":694,"githubUrl":"https://github.com/vxcontrol/pentagi/blob/ea665308baaff015b226f308438a68d929d0f29b/backend/pkg/tools/tools.go#L658-L694","documentation":"This error wraps a failure from ContainerExecInspect, which is called after reading the exec output to learn the exit code of the file-check command. The inspect API call to the Docker daemon failed, so the executor cannot determine whether the command succeeded. This is a Docker API-level failure, not a command failure (a nonzero command exit produces the separate exit-code error).","triggerScenarios":"fte.docker.ContainerExecInspect(ctx, createResp.ID) returns an error: the exec instance no longer exists (daemon restarted or removed the record), the container was removed, daemon unreachable, or ctx canceled.","commonSituations":"Docker daemon restarted between exec creation and inspect, pruning exec records; sandbox container removed by a concurrent cleanup/timeout routine; DOCKER_HOST connection issues in multi-host deployments.","solutions":["Verify the daemon has not restarted: docker info, check dockerd uptime vs error timestamp","Ensure nothing removes the sandbox container while the flow runs (check cleanup goroutines and container timeouts)","Confirm the exec ID is valid by re-running the flow and checking ContainerExecCreate succeeded just before inspect","Inspect the wrapped error for 'No such exec'/'No such container' and treat it as container teardown rather than a tools bug"],"exampleFix":"// before\ninspect, err := fte.docker.ContainerExecInspect(ctx, createResp.ID)\nif err != nil {\n\treturn nil, fmt.Errorf(\"failed to inspect file-check exec: %w\", err)\n}\n// after\ninspect, err := fte.docker.ContainerExecInspect(ctx, createResp.ID)\nif err != nil {\n\tif ctx.Err() != nil {\n\t\treturn nil, fmt.Errorf(\"file-check canceled: %w\", ctx.Err())\n\t}\n\treturn nil, fmt.Errorf(\"failed to inspect file-check exec: %w\", err)\n}","handlingStrategy":"validation","validationCode":"// verify daemon reachability and container presence before the exec lifecycle\ncli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())\nif err != nil {\n\treturn err\n}\nif _, err := cli.ContainerInspect(ctx, containerID); err != nil {\n\treturn fmt.Errorf(\"container %s unavailable: %w\", containerID, err)\n}","typeGuard":null,"tryCatchPattern":"err := runFileCheck(ctx)\nif err != nil {\n\tvar notFound bool\n\tif strings.Contains(err.Error(), \"No such exec\") || strings.Contains(err.Error(), \"No such container\") {\n\t\tnotFound = true\n\t}\n\tif notFound {\n\t\t// container/daemon state lost: recreate sandbox and re-run, not a code bug\n\t\treturn recreateSandboxAndRetry(ctx)\n\t}\n\treturn err\n}","preventionTips":["Prevent concurrent cleanup routines from removing in-use sandbox containers","Detect daemon restarts (docker events) and invalidate in-flight exec IDs","Run create→attach→inspect back-to-back with no long gaps","Log exec IDs so post-mortems can correlate with 'No such exec' errors"],"tags":["docker","exec","inspect","container"],"backgroundTag":"docker-exec-inspect-failed","analyzedSha":"ea665308baaff015b226f308438a68d929d0f29b","analyzedAt":"2026-09-01T14:16:31.421Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}