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When a slow consumer's read position falls behind the in-memory buffer window, LoopProcessLogData would block indefinitely in waitForDataFn because ReadFromDiskFn is nil for MetaAggregator.MetaLogBuffer. The consumer could never return to the caller's outer loop which has its own disk-read path (ReadPersistedLogBuffer). Now, when ReadFromDiskFn is nil and the buffer has data the consumer can't reach, return ResumeFromDiskError to the caller instead of blocking. The callers already handle this error correctly.