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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-11502] misplaced openssl callback registration can cause crashes</title>
                <link>https://jira.mongodb.org/browse/SERVER-11502</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of December 30th, 2013&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
Users can see a rare, intermittent server crash due to a race condition in the OpenSSL interface.  This will only impact users that are running with SSL enabled. The crash can manifest in several ways, but the most common signature is to see a segmentation fault (signal 11) or an abort (signal 6) reported in the &lt;tt&gt;mongod&lt;/tt&gt; logs, with a backtrace that includes references to &lt;tt&gt;libcrypto&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
When using an earlier version than OpenSSL 1.x the server exhibits random, intermittent crashes in the OpenSSL interface.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;SOLUTION&lt;/b&gt;&lt;br/&gt;
The crashes were due to multiple registration and unregistrations of an OpenSSL callback function. The registration is now performed only once and the callback is never unregistered.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
Upgrade to OpenSSL 1.x.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
Production release v2.4.9 contains the fix for this issue, and production release v2.6.0 will contain the fix as well.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h4&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h4&gt;

&lt;p&gt;The calls to register the openssl callbacks in SSLThreadInfo() and unregister the callback in ~SSLThreadInfo() are misplaced: the callback is a static global, whereas SSLThreadInfo objects are per-thread.  The callbacks should be registered once early (before any possible SSL activity) and do not ever need to be unregistered (or at least should not be unregistered on every thread exit, which has been shown to cause crashes due to duplicate frees). Removing the unregister in the destructor addresses the second point and solves the immediate problem, but there may be latent issues due to not registering the callback until the first SSLThreadInfo object is constructed, so I think probably the callback registration should be moved somewhere else as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="96599">SERVER-11502</key>
            <summary>misplaced openssl callback registration can cause crashes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="andreas.nilsson">Andreas Nilsson</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Thu, 31 Oct 2013 17:32:37 +0000</created>
                <updated>Mon, 11 Jul 2016 17:39:55 +0000</updated>
                            <resolved>Thu, 31 Oct 2013 19:58:05 +0000</resolved>
                                    <version>2.4.6</version>
                    <version>2.4.7</version>
                    <version>2.5.3</version>
                                    <fixVersion>2.4.9</fixVersion>
                    <fixVersion>2.5.4</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="452498" author="auto" created="Wed, 6 Nov 2013 19:21:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;agralius&apos;, u&apos;name&apos;: u&apos;Andreas Nilsson&apos;, u&apos;email&apos;: u&apos;andreas.nilsson@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11502&quot; title=&quot;misplaced openssl callback registration can cause crashes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11502&quot;&gt;&lt;del&gt;SERVER-11502&lt;/del&gt;&lt;/a&gt; Moved OpenSSL multithreading callbacks&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5779b6e198c0dd22a99e12837faea4b5e8b2664f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5779b6e198c0dd22a99e12837faea4b5e8b2664f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="449749" author="bruce.lucas@10gen.com" created="Thu, 31 Oct 2013 21:02:51 +0000"  >&lt;p&gt;Looks good - test has run for 20 min and ~500k connections without mishap, vs seconds and a few thousand connections to hit the issue before the fix.&lt;/p&gt;</comment>
                            <comment id="449677" author="andreas.nilsson@10gen.com" created="Thu, 31 Oct 2013 19:40:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bruce.lucas%4010gen.com&quot; class=&quot;user-hover&quot; rel=&quot;bruce.lucas@10gen.com&quot;&gt;bruce.lucas@10gen.com&lt;/a&gt; can you verify that this is fixed on master now before we backport.&lt;/p&gt;</comment>
                            <comment id="449676" author="auto" created="Thu, 31 Oct 2013 19:38:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;agralius&apos;, u&apos;name&apos;: u&apos;Andreas Nilsson&apos;, u&apos;email&apos;: u&apos;andreas.nilsson@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11502&quot; title=&quot;misplaced openssl callback registration can cause crashes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11502&quot;&gt;&lt;del&gt;SERVER-11502&lt;/del&gt;&lt;/a&gt; Moved OpenSSL multithreading callbacks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eab2644c221206c121ac1ab93fcf95c8100f4ff3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eab2644c221206c121ac1ab93fcf95c8100f4ff3&lt;/a&gt;&lt;/p&gt;</comment>
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