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A stale pointer bug refers to a category of delicate programming errors that could arise in codes that conduct dynamic allocation, specifically by means of the C language function "malloc" or its equivalent.
A stale pointer bug is also known as an aliasing bug.
In cases where various pointers address a certain chunk of storage, it could occur that the storage is freed or reallocated by means of a particular alias and then referenced via another. This can lead to delicate and perhaps sporadic lossage with respect to allocation history and the state of the malloc arena.
If no aliases are created for the allocated memory, this kind of bug can be easily avoided. Another option to avoid stale pointer bugs is the use of a higher-level language such as Lisp that incorporates a garbage collector.
The term stale pointer bug is currently linked to C programming; however, this bug was already present in a very similar manner in Fortran and ALGOL 60 during the 1960s.