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    <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-78958] Setting up TLConnection concurrently with shutdown can result in leaking a ConnectionPool</title>
                <link>https://jira.mongodb.org/browse/SERVER-78958</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;TLConnection::setup takes a callback as argument, that is produced via ConnectionPool::SpecificPool::guardCallback. That producer-function puts a shared_ptr to the SpecificPool in the lambda-capture-list for the returned callback, which means the SpecificPool lifetime will be extended to the lifetime of the callback. Similarly, since the SpecificPool owns a shared_ptr to the parent ConnectionPool, it&apos;s lifetime will likewise be extended.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;That callback is scheduled &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b1567c946c31f6232303cb81faab01426d914f81/src/mongo/executor/connection_pool_tl.cpp#L379&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; to run after the TLConnection is set-up or a timer expires. However, if the server shuts-down before this process completes, it will cancel the timer, which results in the timer &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b1567c946c31f6232303cb81faab01426d914f81/src/mongo/executor/connection_pool_tl.cpp#L180&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;failing to ready the future that results in the callback being scheduled due to an early return here&lt;/a&gt;&#160; . And nothing in the code insists that the final continuation of AsyncDBClient::connect from TLConnection::setup runs before process-shutdown, which means that the callback may never be scheduled and run. If the callback is therefore leaked, it leaks a shared_ptr to a SpecificPool, which in turn results in a ConnectionPool being leaked.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2391470">SERVER-78958</key>
            <summary>Setting up TLConnection concurrently with shutdown can result in leaking a ConnectionPool</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Jul 2023 21:42:32 +0000</created>
                <updated>Thu, 7 Dec 2023 20:25:50 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5704151" author="jason.chan" created="Thu, 14 Sep 2023 14:27:20 +0000"  >&lt;p&gt;We think this leak has existed in older versions and the solution right now is a bit more involved. We should consider suppressing the sanitizer failure for now to avoid generating more BFs.&lt;/p&gt;</comment>
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