juicedata/juicefs · error

error checking pprof alive: %v

Error message

error checking pprof alive: %v

What it means

Returned by checkPort during `juicefs debug` when the probe GET to the pprof cmdline endpoint fails entirely (connection refused/timeout). It means the pprof service on the discovered port is not reachable, so the port either is wrong or the service died.

Source

Thrown at cmd/debug.go:255

	defer func(body io.ReadCloser) {
		if err := body.Close(); err != nil {
			logger.Errorf("error closing body: %v", err)
		}
	}(resp.Body)
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("error reading response: %v", err)
	}

	return body, nil
}

// check pprof service status
func checkPort(port int, amp string) error {
	url := fmt.Sprintf("http://localhost:%d/debug/pprof/cmdline?debug=1", port)
	resp, err := getRequest(url, 3*time.Second)
	if err != nil {
		return fmt.Errorf("error checking pprof alive: %v", err)
	}
	resp = bytes.ReplaceAll(resp, []byte{0}, []byte{' '})
	fields := strings.Fields(string(resp))
	flag := false
	for _, field := range fields {
		if amp == field {
			flag = true
		}
	}
	if !flag {
		return fmt.Errorf("mount point mismatch: \n%s\n%s", resp, amp)
	}
	return nil
}

type metricItem struct {
	name, url string
}

View on GitHub (pinned to c9a67b23e8)

Solutions

1. Verify the mount process still runs and the agent exported the pprof port
2. Check firewall/localhost access to the pprof port

When it happens

Trigger: Thrown at cmd/debug.go:255 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of juicedata/juicefs@c9a67b23e8 (2026-09-06). Data as JSON: /api/errors/52be934f2e942635. Report an issue: GitHub.