14 lines
2.6 KiB
HTML
14 lines
2.6 KiB
HTML
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>heisenbug</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../H.html" title="H"/><link rel="previous" href="Hed-Rat.html" title="Hed Rat"/><link rel="next" href="hell-desk.html" title="hell desk"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">heisenbug</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="Hed-Rat.html">Prev</a> </td><th width="60%" align="center">H</th><td width="20%" align="right"> <a accesskey="n" href="hell-desk.html">Next</a></td></tr></table><hr/></div><dt><a id="heisenbug"/><dt xmlns="" id="heisenbug"><b>heisenbug</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="pronunciation">/hi:´zen·buhg/</span>, <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p> [from Heisenberg's Uncertainty Principle in quantum physics] A bug
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that disappears or alters its behavior when one attempts to probe or
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isolate it. (This usage is not even particularly fanciful; the use of a
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debugger sometimes alters a program's operating environment significantly
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enough that buggy code, such as that which relies on the values of
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uninitialized memory, behaves quite differently.) Antonym of
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<a href="../B/Bohr-bug.html"><i class="glossterm">Bohr bug</i></a>; see also <a href="../M/mandelbug.html"><i class="glossterm">mandelbug</i></a>,
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<a href="../S/schroedinbug.html"><i class="glossterm">schroedinbug</i></a>. In C, nine out of ten heisenbugs
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result from uninitialized auto variables,
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<a href="../F/fandango-on-core.html"><i class="glossterm">fandango on core</i></a> phenomena (esp. lossage related to corruption of the
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malloc <a href="../A/arena.html"><i class="glossterm">arena</i></a>) or errors that
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<a href="../S/smash-the-stack.html"><i class="glossterm">smash the stack</i></a>.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Hed-Rat.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../H.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="hell-desk.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Hed Rat </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> hell desk</td></tr></table></div></body></html>
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