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buffer overflow

buffer overflow: n. What happens when you try to stuff more data
   into a buffer (holding area) than it can handle.  This may be due
   to a mismatch in the processing rates of the producing and
   consuming processes (see overrun and firehose syndrome),
   or because the buffer is simply too small to hold all the data that
   must accumulate before a piece of it can be processed.  For example,
   in a text-processing tool that crunches a line at a time, a
   short line buffer can result in lossage as input from a long
   line overflows the buffer and trashes data beyond it.  Good
   defensive programming would check for overflow on each character
   and stop accepting data when the buffer is full up.  The term is
   used of and by humans in a metaphorical sense.  "What time did I
   agree to meet you?  My buffer must have overflowed."  Or "If I
   answer that phone my buffer is going to overflow."  See also
   spam, overrun screw.