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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-53995] ReplicaSetMonitor shared_ptr instance should be freed outside of mutex scope</title>
                <link>https://jira.mongodb.org/browse/SERVER-53995</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In ReplicaSetMonitorManager::getMonitorForHost() we iterate over the _monitors map, which contains weak_ptrs as the value, and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6671f817d9c27584c597034ca24739183e223708/src/mongo/client/replica_set_monitor_manager.cpp#L211&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;extract a shared_ptr while holding the class mutex&lt;/a&gt;. However, if the owning shared_ptr is freed after we&apos;ve acquired it here, then the local shared_ptr will be the last  reference and destroy the ReplicaSetMonitor that is pointed to. The destructor of that class tries to acquire the same mutex and deadlocks.&lt;/p&gt;

&lt;p&gt;This can be fixed by declaring the local shared_ptr outside the lock and freeing it after the lock is released. However, since each iteration of the loop acquires a different shared_ptr, one shared_ptr variable can&apos;t be used because it&apos;s current value will be released when the next one is assigned to it possibly releasing the last reference. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1598089">SERVER-53995</key>
            <summary>ReplicaSetMonitor shared_ptr instance should be freed outside of mutex scope</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="13201">Fixed</resolution>
                                        <assignee username="jason.zhang@mongodb.com">Jason Zhang</assignee>
                                    <reporter username="alex.taskov@mongodb.com">Alexander Taskov</reporter>
                        <labels>
                            <label>Sharding-NYC</label>
                            <label>bkp</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 22 Jan 2021 22:03:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:29 +0000</updated>
                            <resolved>Wed, 17 Feb 2021 15:24:49 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3619266" author="xgen-internal-githook" created="Wed, 17 Feb 2021 15:21:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Zhang&apos;, &apos;email&apos;: &apos;jason.zhang@mongodb.com&apos;, &apos;username&apos;: &apos;jz1242&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53995&quot; title=&quot;ReplicaSetMonitor shared_ptr instance should be freed outside of mutex scope&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53995&quot;&gt;&lt;del&gt;SERVER-53995&lt;/del&gt;&lt;/a&gt; ReplicaSetMonitor shared_ptr instance should be freed outside of mutex scope&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0f7281ffd6bf5f700ff9d0f6163beccf6803a58a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0f7281ffd6bf5f700ff9d0f6163beccf6803a58a&lt;/a&gt;&lt;/p&gt;</comment>
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