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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-76822] Data race on LockRequest::lock between checking conflicting requests and cleaning unused locks</title>
                <link>https://jira.mongodb.org/browse/SERVER-76822</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;tt&gt;LockManager::hasConflictingRequests&lt;/tt&gt; we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f1c4f86d1b5ae01a6823fe67c6b3922fe393b2d5/src/mongo/db/concurrency/lock_manager.cpp#L868&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;read &lt;tt&gt;LockRequest::lock&lt;/tt&gt;&lt;/a&gt; before &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f1c4f86d1b5ae01a6823fe67c6b3922fe393b2d5/src/mongo/db/concurrency/lock_manager.cpp#L873&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;getting the resource id and taking the bucket mutex&lt;/a&gt;. This can race with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f1c4f86d1b5ae01a6823fe67c6b3922fe393b2d5/src/mongo/db/concurrency/lock_manager.cpp#L204&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;creating a new lock request&lt;/a&gt; when &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f1c4f86d1b5ae01a6823fe67c6b3922fe393b2d5/src/mongo/db/concurrency/lock_manager.cpp#L716&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cleaning up unused locks&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Once potential solution may be to change the interface for &lt;tt&gt;LockManager::hasConflictingRequests&lt;/tt&gt; to take in the resource id, so that the bucket mutex can be locked right away.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2331561">SERVER-76822</key>
            <summary>Data race on LockRequest::lock between checking conflicting requests and cleaning unused locks</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="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 May 2023 22:19:38 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:01 +0000</updated>
                            <resolved>Thu, 4 May 2023 20:43:28 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5418234" author="xgen-internal-githook" created="Thu, 11 May 2023 16:09:39 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76822&quot; title=&quot;Data race on LockRequest::lock between checking conflicting requests and cleaning unused locks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76822&quot;&gt;&lt;del&gt;SERVER-76822&lt;/del&gt;&lt;/a&gt; Hold bucket mutex when accessing lock head for checking conflicting lock requests&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 881020bf20b0c0dcf1ac949aa8d9e6b7f62bd0a9)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2da1ba2e3b0eda88d367298da0dbe51edf1d4040&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2da1ba2e3b0eda88d367298da0dbe51edf1d4040&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5402162" author="xgen-internal-githook" created="Thu, 4 May 2023 20:35:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76822&quot; title=&quot;Data race on LockRequest::lock between checking conflicting requests and cleaning unused locks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76822&quot;&gt;&lt;del&gt;SERVER-76822&lt;/del&gt;&lt;/a&gt; Hold bucket mutex when accessing lock head for checking conflicting lock requests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/881020bf20b0c0dcf1ac949aa8d9e6b7f62bd0a9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/881020bf20b0c0dcf1ac949aa8d9e6b7f62bd0a9&lt;/a&gt;&lt;/p&gt;</comment>
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