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    <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-70256] Fix the race condition in ClusterCursorManager</title>
                <link>https://jira.mongodb.org/browse/SERVER-70256</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It appears that&#160;&lt;tt&gt;cursorsTimedOut()&lt;/tt&gt;&#160;and&#160;&lt;tt&gt;incrementCursorsTimedOut&lt;/tt&gt; can be called on different threads, and there is no lock&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo/blob/7b470a0d23c5a0e86f398082f88e1f136837d320/src/mongo/s/query/cluster_cursor_manager.h#L518-L524&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/7b470a0d23c5a0e86f398082f88e1f136837d320/src/mongo/s/query/cluster_cursor_manager.h#L518-L524&lt;/a&gt;&lt;/p&gt;


&lt;p&gt;Here&apos;s the writer:&lt;br/&gt;
&lt;a href=&quot;https://github.com/10agen/mongo/blob/7b470a0d23c5a0e86f398082f88e1f136837d320/src/mongo/s/query/cluster_cursor_cleanup_job.cpp#L65-L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10agen/mongo/blob/7b470a0d23c5a0e86f398082f88e1f136837d320/src/mongo/s/query/cluster_cursor_cleanup_job.cpp#L65-L66&lt;/a&gt;&lt;/p&gt;

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

&lt;p&gt;Here&apos;s the reader:&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo/blob/7b470a0d23c5a0e86f398082f88e1f136837d320/src/mongo/s/cluster_cursor_stats.cpp#L48-L49&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/7b470a0d23c5a0e86f398082f88e1f136837d320/src/mongo/s/cluster_cursor_stats.cpp#L48-L49&lt;/a&gt;&lt;/p&gt;


&lt;p&gt;In practice, this race is unlikely, but it&apos;s worth fixing. Also, it&apos;s creating a lot of noise on TSAN builds (e.g., BF-26555). Probably just using a &lt;tt&gt;std::atomic&lt;/tt&gt; for &lt;tt&gt;_cursorsTimedOut&lt;/tt&gt; will solve the issue.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2152887">SERVER-70256</key>
            <summary>Fix the race condition in ClusterCursorManager</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="romans.kasperovics@mongodb.com">Romans Kasperovics</assignee>
                                    <reporter username="mohammad.dashti@mongodb.com">Mohammad Dashti</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Oct 2022 22:00:16 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:20 +0000</updated>
                            <resolved>Thu, 13 Oct 2022 10:06:49 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4896237" author="xgen-internal-githook" created="Tue, 11 Oct 2022 21:52:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70256&quot; title=&quot;Fix the race condition in ClusterCursorManager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70256&quot;&gt;&lt;del&gt;SERVER-70256&lt;/del&gt;&lt;/a&gt; Protect ClusterCursorManager::_cursorsTimeOut from data race&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2e21f0a40bdce56be9d96059356f8c79a1dbc105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2e21f0a40bdce56be9d96059356f8c79a1dbc105&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2157109">SERVER-70486</issuekey>
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