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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-49874] Make the server to be able to run JavaScript functions with ThreadSanitizer instrumentation (TSAN)</title>
                <link>https://jira.mongodb.org/browse/SERVER-49874</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Problem&quot;&gt;&lt;/a&gt;Problem&lt;/h3&gt;

&lt;p&gt;When the server is built with the &lt;a href=&quot;https://clang.llvm.org/docs/ThreadSanitizer.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ThreadSanitizer instrumentation (TSAN) &lt;/a&gt; (build variant: &#8220;~ TSAN Enterprise Ubuntu 20.04 DEBUG (Biggie)&#8221;) execution of JavaScript functions fails with the exception below.&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 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;{&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;code&quot;&lt;/span&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;:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;139&lt;/span&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;,&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;codeName&quot;&lt;/span&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;:&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;JSInterpreterFailure&quot;&lt;/span&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;,&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;errmsg&quot;&lt;/span&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;:&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;InternalError: too much recursion&quot;&lt;/span&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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;An example of the test that fails under TSAN is jstests/core/mr_sort.js.&lt;/p&gt;

&lt;p&gt;The stack size for MozJS JavaScript engine execution is decided at &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/scripting/mozjs/implscope.cpp#L378&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/scripting/mozjs/implscope.cpp#L378&lt;/a&gt;&lt;b&gt;.&lt;/b&gt; For TSAN builds the stack size in a relevant test is around 180000 bytes, and for a regular build - around 950000 bytes, due to a memory overhead of TSAN instrumentation. 200kB of free stack space appears to be not enough to run JavaScript functions.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Potentialsolutions&quot;&gt;&lt;/a&gt;Potential solutions&lt;/h2&gt;
&lt;ul&gt;
	&lt;li&gt;Increase stack sizes for ThreadSanitizer instrumented builds.
	&lt;ul&gt;
		&lt;li&gt;On client connected worker threads, one could add TSAN specific customization to &lt;em&gt;launchServiceWorkerThread&lt;/em&gt; to increase the stack sizes when using TSAN. If it is on the thread owned by the &lt;em&gt;ProxyScope&lt;/em&gt; it will be harder because it uses a &lt;em&gt;std::thread&lt;/em&gt;, and we don&#8217;t have control over the stack sizes for those.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1420499">SERVER-49874</key>
            <summary>Make the server to be able to run JavaScript functions with ThreadSanitizer instrumentation (TSAN)</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</assignee>
                                    <reporter username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</reporter>
                        <labels>
                            <label>qexec-team</label>
                            <label>thread-sanitizer</label>
                    </labels>
                <created>Fri, 24 Jul 2020 18:26:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:05:16 +0000</updated>
                            <resolved>Mon, 17 Aug 2020 15:29:55 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>JavaScript</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3342576" author="xgen-internal-githook" created="Mon, 17 Aug 2020 15:27:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49874&quot; title=&quot;Make the server to be able to run JavaScript functions with ThreadSanitizer instrumentation (TSAN)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49874&quot;&gt;&lt;del&gt;SERVER-49874&lt;/del&gt;&lt;/a&gt; Make the server to be able to run JavaScript functions with ThreadSanitizer instrumentation (TSAN)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8fe87db3b12f2e9fd4b68d9fcb33bff8b9d68d9a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8fe87db3b12f2e9fd4b68d9fcb33bff8b9d68d9a&lt;/a&gt;&lt;/p&gt;</comment>
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