[1] : Jargon File (4.3.1, 29 Jun 2001)

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.


see also:
bohr bug mandelbug schroedinbug fandango on core arena smash the stack 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

heisenbug
     
         /hi:'zen-buhg/ from heisenberg's uncertainty
        principle in quantum physics a bug that disappears or alters
        its behaviour 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 uninitialised memory, behaves quite
        differently.
     
        in c, nine out of ten heisenbugs result from uninitialised
        auto variables, fandango on core phenomena especially
        lossage related to corruption of the malloc arena or errors
        that smash the stack.
     
        opposite: bohr bug.  see also mandelbug, schroedinbug.
     
        jargon file
     
        1995-02-28
     
     
see also:
c fandango on core arena smash the stack bohr bug mandelbug 
schroedinbug jargon file 

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Heisenbug, definition of term: Heisenbug
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