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memory leak

memory leak: n. An error in a program's dynamic-store allocation
   logic that causes it to fail to reclaim discarded memory, leading
   to eventual collapse due to memory exhaustion.  Also (esp. at
   CMU) called core leak.  These problems were severe on older
   machines with small, fixed-size address spaces, and special "leak
   detection" tools were commonly written to root them out.  With the
   advent of virtual memory, it is unfortunately easier to be sloppy
   about wasting a bit of memory (although when you run out of memory
   on a VM machine, it means you've got a *real* leak!).  See
   aliasing bug, fandango on core, smash the stack,
   precedence lossage, overrun screw, leaky heap,