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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-8170] v8 leaks several external objects</title>
                <link>https://jira.mongodb.org/browse/SERVER-8170</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This was encountered while debugging a memory leak in v8, and can be reproduced in the shell or server w/ db.eval().&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    var res = mongo.find(&quot;test.a&quot;, {b:new Array(10240).toString()}, {a:1}, 0, 0, 0, 0);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="61946">SERVER-8170</key>
            <summary>v8 leaks several external objects</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="benjamin.becker">Ben Becker</assignee>
                                    <reporter username="benjamin.becker">Ben Becker</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Jan 2013 22:13:03 +0000</created>
                <updated>Mon, 11 Jul 2016 17:59:04 +0000</updated>
                            <resolved>Fri, 1 Mar 2013 18:44:45 +0000</resolved>
                                    <version>2.3.2</version>
                                    <fixVersion>2.4.0-rc2</fixVersion>
                                    <component>JavaScript</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="279255" author="auto" created="Fri, 1 Mar 2013 18:47:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-03-01T18:40:05Z&apos;, u&apos;name&apos;: u&apos;Ben Becker&apos;, u&apos;email&apos;: u&apos;ben.becker@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8170&quot; title=&quot;v8 leaks several external objects&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8170&quot;&gt;&lt;del&gt;SERVER-8170&lt;/del&gt;&lt;/a&gt;: free all external JavaScript resources on V8Scope destruction&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/77d55de67cf5700a4472d60ed2df4d7b5157de95&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/77d55de67cf5700a4472d60ed2df4d7b5157de95&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="277429" author="auto" created="Wed, 27 Feb 2013 20:17:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-02-27T20:16:32Z&apos;, u&apos;name&apos;: u&apos;Ben Becker&apos;, u&apos;email&apos;: u&apos;ben.becker@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8170&quot; title=&quot;v8 leaks several external objects&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8170&quot;&gt;&lt;del&gt;SERVER-8170&lt;/del&gt;&lt;/a&gt;: manually free external resources upon V8Scope destruction&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5637ebbc1c778d55dc105a3dc8c6d016523d095e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5637ebbc1c778d55dc105a3dc8c6d016523d095e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="275899" author="benjamin.becker" created="Tue, 26 Feb 2013 05:09:56 +0000"  >&lt;p&gt;Updating this ticket to track v2.4-specific leaks, as the v2.0.7 leaks are related to holding onto client cursors.&lt;/p&gt;</comment>
                            <comment id="264413" author="auto" created="Tue, 12 Feb 2013 20:33:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-02-12T19:13:35Z&apos;, u&apos;name&apos;: u&apos;Ben Becker&apos;, u&apos;email&apos;: u&apos;ben.becker@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8170&quot; title=&quot;v8 leaks several external objects&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8170&quot;&gt;&lt;del&gt;SERVER-8170&lt;/del&gt;&lt;/a&gt;: cleanup and unify GC callbacks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/75b0536f0032627241fbad47baba64322834e523&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/75b0536f0032627241fbad47baba64322834e523&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="250116" author="benjamin.becker" created="Fri, 25 Jan 2013 23:08:03 +0000"  >&lt;p&gt;Attaching &lt;tt&gt;dbclient_memleak.patch&lt;/tt&gt; to reproduce the observed behavior.  Reproducible by simply passing a BSONObj to the query() method.  Apply with &lt;tt&gt;patch -p1 &amp;lt; dbclient_memleak.patch&lt;/tt&gt;.  This patch reflects the issue that was observed, but only because it calls auto_ptr::release() without explicitly freeing the object.  This seems to indicate that we either:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Aren&apos;t removing all references to the cursor returned by mongoFind()&lt;/li&gt;
	&lt;li&gt;V8 does not release the allocated memory back to the OS on v8::V8::LowMemoryNotification()&lt;/li&gt;
&lt;/ol&gt;
</comment>
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                            <attachment id="23533" name="dbclient_memleak.patch" size="2479" author="benjamin.becker" created="Fri, 25 Jan 2013 23:08:03 +0000"/>
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