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In C programming, to corrupt the execution stack by writing past the end of a local array or other data structure. Code that smashes the stack can cause a return from the routine to jump to a random address, resulting in insidious data-dependent bugs.
Variants include "trash" the stack, scribble the stack, mangle the stack.
See spam; see also aliasing bug, fandango on core, memory leak, memory smash, precedence lossage, overrun screw.