heisenbug: /hi:'zen-buhg/ n. [from Heisenberg's Uncertainty
Principle in quantum physics] A bug that disappears or alters its
behavior when one attempts to probe or isolate it. (This usage is
not even particularly fanciful; the use of a debugger sometimes
alters a program's operating environment significantly enough that
buggy code, such as that which relies on the values of uninitialized
memory, behaves quite differently.) Antonym of Bohr bug; see also
mandelbug, schroedinbug. In C, nine out of ten heisenbugs
result from uninitialized auto variables, fandango on core
phenomena (esp. lossage related to corruption of the malloc arena)
or errors that smash the stack.
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