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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<html xmlns="http://www.w3.org/1999/xhtml"><head><title>aliasing bug</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="../A.html" title="A"/><link rel="previous" href="Alderson-loop.html" title="Alderson loop"/><link rel="next" href="Alice-and-Bob.html" title="Alice and Bob"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">aliasing bug</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="Alderson-loop.html">Prev</a> </td><th width="60%" align="center">A</th><td width="20%" align="right"> <a accesskey="n" href="Alice-and-Bob.html">Next</a></td></tr></table><hr/></div><dt><a id="aliasing-bug"/><dt xmlns="" id="aliasing-bug"><b>aliasing bug</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p> A class of subtle programming errors that can arise in code that
does dynamic allocation, esp. via
<span class="citerefentry"><span class="refentrytitle">malloc</span>(3)</span>
or equivalent. If several pointers address (are <span class="firstterm">aliases for</span>) a given hunk of storage, it may
happen that the storage is freed or reallocated (and thus moved) through
one alias and then referenced through another, which may lead to subtle
(and possibly intermittent) lossage depending on the state and the
allocation history of the malloc <a href="arena.html"><i class="glossterm">arena</i></a>. Avoidable
by use of allocation strategies that never alias allocated core, or by use
of higher-level languages, such as <a href="../L/LISP.html"><i class="glossterm">LISP</i></a>, which
employ a garbage collector (see <a href="../G/GC.html"><i class="glossterm">GC</i></a>). Also called a
<a href="../S/stale-pointer-bug.html"><i class="glossterm">stale pointer bug</i></a>. See also
<a href="../P/precedence-lossage.html"><i class="glossterm">precedence lossage</i></a>,
<a href="../S/smash-the-stack.html"><i class="glossterm">smash the stack</i></a>,
<a href="../F/fandango-on-core.html"><i class="glossterm">fandango on core</i></a>,
<a href="../M/memory-leak.html"><i class="glossterm">memory leak</i></a>,
<a href="../M/memory-smash.html"><i class="glossterm">memory smash</i></a>,
<a href="../O/overrun-screw.html"><i class="glossterm">overrun screw</i></a>, <a href="../S/spam.html"><i class="glossterm">spam</i></a>.</p></dd><dd><p>Historical note: Though this term is nowadays associated with C
programming, it was already in use in a very similar sense in the Algol-60
and FORTRAN communities in the 1960s.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Alderson-loop.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../A.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Alice-and-Bob.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Alderson loop </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Alice and Bob</td></tr></table></div></body></html>