Issue 1544279: Socket module is not thread-safe

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Tracker Problem</a></li> </ul> </li> </ul> </li> </ul> </div>  </div>  <div id="content-body"> <div id="body-main"> <div id="content"> <div id="breadcrumb"> Issue1544279 </div> <div id="migration-notice"> <div id="migration-images"> <img width="32" src="@@file/python-logo-small.png" /> ➜ <a href="https://github.com/python/cpython/issues"><img width="32" src="@@file/gh-icon.png" /></a> </div> <p>This issue tracker <b>has been migrated to <a href="https://github.com/python/cpython/issues">GitHub</a></b>, and is currently <b>read-only</b>.<br /> For more information, <a title="GitHub FAQs" href="https://devguide.python.org/gh-faq/"> see the GitHub FAQs in the Python's Developer Guide.</a></p> </div> <div> <form method="post" name="itemSynopsis" onsubmit="return submit_once()" enctype="multipart/form-data" action="issue1544279"> <div id="gh-issue-link"> <a href="https://github.com/python/cpython/issues/43870"> <img width="32" src="@@file/gh-icon.png" /> <p> <span>This issue has been migrated to GitHub:</span> https://github.com/python/cpython/issues/43870 </p> </a> </div> <fieldset><legend>classification</legend> <table class="form"> <tr> <th class="required"><a href="http://docs.python.org/devguide/triaging.html#title" target="_blank">Title</a>:</th> <td colspan="3"> <span>Socket module is not thread-safe</span> <input type="hidden" name="title" value="Socket module is not thread-safe"> </td> </tr> <tr> <th class="required"><a href="http://docs.python.org/devguide/triaging.html#type" target="_blank">Type</a>:</th> <td></td> <th><a href="http://docs.python.org/devguide/triaging.html#stage" target="_blank">Stage</a>:</th> <td></td> </tr> <tr> <th><a href="http://docs.python.org/devguide/triaging.html#components" target="_blank">Components</a>:</th> <td>Interpreter Core</td> <th><a href="http://docs.python.org/devguide/triaging.html#versions" target="_blank">Versions</a>:</th> <td></td> </tr> </table> </fieldset> <fieldset><legend>process</legend> <table class="form"> <tr> <th><a href="http://docs.python.org/devguide/triaging.html#status" target="_blank">Status</a>:</th> <td>closed</td> <th><a href="http://docs.python.org/devguide/triaging.html#resolution" target="_blank">Resolution</a>:</th> <td>accepted</td> </tr> <tr> <th> <a href="http://docs.python.org/devguide/triaging.html#dependencies" target="_blank">Dependencies</a>: </th> <td> </td> <th><a href="http://docs.python.org/devguide/triaging.html#superseder" target="_blank">Superseder</a>:</th> <td> </td> </tr> <tr> <th> <a href="http://docs.python.org/devguide/triaging.html#assigned-to" target="_blank">Assigned To</a>: </th> <td> loewis </td> <th> <a href="http://docs.python.org/devguide/triaging.html#nosy-list" target="_blank">Nosy List</a>: </th> <td> loewis, sobomax </td> </tr> <tr> <th> <a href="http://docs.python.org/devguide/triaging.html#priority" target="_blank">Priority</a>: </th> <td>high</td> <th> <a href="http://docs.python.org/devguide/triaging.html#keywords" target="_blank">Keywords</a>: </th> <td>patch</td> </tr> </table> </fieldset> </form> <p>Created on <strong>2006-08-21 23:24</strong> by <strong>sobomax</strong>, last changed <strong>2022-04-11 14:56</strong> by <strong>admin</strong>. This issue is now <strong style="color:#00F; background-color:inherit;">closed</strong>.</p> <table class="files"> <tr><th colspan="5" class="header">Files</th></tr> <tr> <th>File name</th> <th>Uploaded</th> <th>Description</th> <th>Edit</th> </tr> <tr> <td> <a href="file7490/socketmodule.diff.v2">socketmodule.diff.v2</a> </td> <td> <span>sobomax</span>, <span>2006-08-21 23:24</span> </td> <td>Proposed fix.</td> <td> </td> </tr> </table> <table class="messages"> <tr><th colspan="4" class="header">Messages (3)</th></tr> <tr> <th> <a href="#msg50959" id="msg50959">msg50959</a> - <a href="msg50959">(view)</a></th> <th>Author: Maxim Sobolev (sobomax)</th> <th>Date: 2006-08-21 23:24</th> </tr> <tr> <td colspan="4" class="content"> <pre>The socket module make a great effort to be thread- safe, but misses one big point - it uses single per-instance buffer to hold resolved sockaddr_xxx structures. Therefore, on SMP system it is possible that several threads calling functions that perform address resolution in parallel will stomp on each other resulting in incorrect or invalid address to be used in each case. For example, two threads calling sendto() in parallel can result in packets to be sent to incorrect addresses - packets from thread one from time to time will be sent to address requested by thread two and vice versa. Another, smaller issue is that the call to getnameinfo () is not protected with netdb mutex on systems that don't have thread- safe resolver. P.S. This is very serious problem for us. For some reason my previous patch submission has been downgraded to bug report and forgotten completely, so that I am re-submitting.</pre> </td> </tr> <tr> <th> <a href="#msg50960" id="msg50960">msg50960</a> - <a href="msg50960">(view)</a></th> <th>Author: Martin v. Löwis (loewis) <span title="Contributor form received">*</span> <img src="@@file/committer.png" title="Python committer" alt="(Python committer)" /></th> <th>Date: 2006-08-21 23:42</th> </tr> <tr> <td colspan="4" class="content"> <pre>Logged In: YES user_id=21627 Sorry about forgetting your patch. Will look at it again for 2.5.1. P.S. The previous issue was <a class="closed" title="[closed] Many functions in socket module are not thread safe" href="issue1467080">#1467080</a>. It wasn't "downgraded to bug report"; instead, you submitted it as a bug report to start with.</pre> </td> </tr> <tr> <th> <a href="#msg50961" id="msg50961">msg50961</a> - <a href="msg50961">(view)</a></th> <th>Author: Martin v. Löwis (loewis) <span title="Contributor form received">*</span> <img src="@@file/committer.png" title="Python committer" alt="(Python committer)" /></th> <th>Date: 2006-12-03 11:24</th> </tr> <tr> <td colspan="4" class="content"> <pre> Thanks for the patch. Committed as <a href="https://hg.python.org/lookup/r52906">r52906</a> and <a href="https://hg.python.org/lookup/r52907">r52907</a>.</pre> </td> </tr> </table> <table class="history table table-condensed table-striped"><tr><th colspan="4" class="header"> History </th></tr><tr> <th>Date</th> <th>User</th> <th>Action</th> <th>Args</th> </tr> <tr><td>2022-04-11 14:56:19</td><td>admin</td><td>set</td><td>github: 43870</td></tr> <tr><td>2010-07-09 18:28:09</td><td>skrah</td><td>link</td><td><a rel="nofollow" href="issue1441984">issue1441984 superseder</a></td></tr> <tr><td>2006-08-21 23:24:25</td><td>sobomax</td><td>create</td><td></td></tr> </table> </div> </div>  <div id="footer"> <div id="credits"> Supported by <a href="https://python.org/psf-landing/" title="The Python Software Foundation">The Python Software Foundation</a>, <br> Powered by <a href="http://roundup.sourceforge.net" title="Powered by the Roundup Issue Tracker">Roundup</a> </div>  Copyright © 1990-2022, <a href="http://python.org/psf">Python Software Foundation</a><br /> <a href="http://python.org/about/legal">Legal Statements</a> </div>  </div>  </div>  </body> </html>

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Issue 1544279: Socket module is not thread-safe - Python tracker