While I don't recall a specific instance, the best category are those bugs which only manifest after the system has been running for hours or days, and when it goes down, leaves little or no trace of what caused the crash. What makes them particularly bad is that no matter how well you think you've reasoned out the cause, and applied the appropriate fix to remedy it, you'll have to wait for another few hours or days to get any confidence at all that you've really nailed it.you got a lot of time within next testing :)
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