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    <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-76640] Latch analyzer complains theoretical deadlock with SingleServerDiscoveryMonitor</title>
                <link>https://jira.mongodb.org/browse/SERVER-76640</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/ecc1631b5b299b0753909f7abf874008e5e51e7e/src/mongo/client/server_discovery_monitor.cpp#L208&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This&lt;/a&gt; and &lt;a href=&quot;https://github.com/10gen/mongo/blob/ecc1631b5b299b0753909f7abf874008e5e51e7e/src/mongo/client/server_discovery_monitor.cpp#L228&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; place holds SingleServerDiscoveryMonitor::mutex lock with HierarchicalAcquisitionLevel(4), and runs SingleServerDiscoveryMonitor::_onHelloFailure() which in-turn acquires &lt;a href=&quot;https://github.com/10gen/mongo/blob/ecc1631b5b299b0753909f7abf874008e5e51e7e/src/mongo/client/sdam/topology_listener.cpp#L124&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;TopologyEventsPublisher::_eventQueueMutex&lt;/a&gt; HierarchicalAcquisitionLevel(6). This triggers latch analyzer to throw the following message in my local testing.&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;&quot;Theoretical deadlock found on use of latch&quot;,&quot;attr&quot;:{&quot;reason&quot;:&quot;Latch acquired after other latch of lower level&quot;,&quot;latch&quot;:{&quot;name&quot;:&quot;TopologyEventsPublisher::_eventQueueMutex&quot;,&quot;latchId&quot;:11027,&quot;level&quot;:6,&quot;file&quot;:&quot;src/mongo/client/sdam/topology_listener.h&quot;,&quot;line&quot;:149},&quot;latchesHeld&quot;:[{&quot;name&quot;:&quot;SingleServerDiscoveryMonitor::mutex&quot;,&quot;latchId&quot;:11030,&quot;level&quot;:4,&quot;file&quot;:&quot;src/mongo/client/server_discovery_monitor.h&quot;,&quot;line&quot;:103}]}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;It seems like a false alarm. But just passing to sharding team to do formal evaluation if that&apos;s a false alarm and can be ignored (Or) need some sort of fix.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2326756">SERVER-76640</key>
            <summary>Latch analyzer complains theoretical deadlock with SingleServerDiscoveryMonitor</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                            <label>sharding-nyc-subteam2</label>
                    </labels>
                <created>Fri, 28 Apr 2023 00:55:35 +0000</created>
                <updated>Thu, 11 May 2023 14:22:48 +0000</updated>
                            <resolved>Thu, 11 May 2023 14:22:21 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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