What steps should be taken if a system malfunction or failure is detected?

When a system malfunction or failure is detected:

1. Error logging — record detailed information about the failure for subsequent analysis.
2. Problem isolation — attempt to localize the failure to minimize its impact on the system.
3. State recovery — if possible, restore the system to a stable state (e.g., rollback transactions).
4. Notification — inform responsible personnel or monitoring systems.
5. Root cause analysis — study logs and conditions that caused the failure to prevent recurrence.
6. Applying fixes — make necessary changes to the code or configuration.

In Go, error handling often involves returning an error value, for example:

func readFile(filename string) ([]byte, error) {
    data, err := os.ReadFile(filename)
    if err != nil {
        // Log and return the error
        log.Printf("File read error: %v", err)
        return nil, err
    }
    return data, nil
}

Therefore, it is important to handle errors properly so that the system can respond correctly to failures.