Heisenbug: /hi:'zen-buhg/ [from Heisenberg's Uncertainty Principle In Quantum Physics] N.

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:heisenbug: /hi:'zen-buhg/ [from Heisenberg's Uncertainty
Principle in quantum physics] n. 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}.
-- The AI Hackers Dictionary