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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-70502] Prevent data race in `NetworkInterfaceMock::NetworkOperation`</title>
                <link>https://jira.mongodb.org/browse/SERVER-70502</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;NetworkInterfaceMock&lt;/tt&gt; can receive multiple responses for a particular request, though only the first to &lt;a href=&quot;https://github.com/10gen/mongo/blob/c48dfb6dc05fa1c381b4b0b913ce57c47d2932c3/src/mongo/executor/network_interface_mock.cpp#L624&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;be processed&lt;/a&gt; is used while any others are disregarded. This is handled by checking whether a&#160;&lt;tt&gt;NetworkOperation&lt;/tt&gt; has been marked as finished, and &lt;a href=&quot;https://github.com/10gen/mongo/blob/c48dfb6dc05fa1c381b4b0b913ce57c47d2932c3/src/mongo/executor/network_interface_mock.cpp#L723&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;doing so&lt;/a&gt; if not. Response processing can only be done by a thread simulating the network.&lt;/p&gt;

&lt;p&gt;It is possible for another thread to &lt;a href=&quot;https://github.com/10gen/mongo/blob/c48dfb6dc05fa1c381b4b0b913ce57c47d2932c3/src/mongo/executor/network_interface_mock.cpp#L145-L152&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;issue a cancellation response&lt;/a&gt; for a particular request and cause a data race when checking whether the operation the response is for has already finished, while the network thread is processing the first response received for the same request.&lt;/p&gt;

&lt;p&gt;Since any responses processed for a request besides the first are disregarded, the &lt;a href=&quot;https://github.com/10gen/mongo/blob/c48dfb6dc05fa1c381b4b0b913ce57c47d2932c3/src/mongo/executor/network_interface_mock.cpp#L160&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;problematic read that checks if an operation has finished&lt;/a&gt; in order to determine whether or not to send a cancellation response is superfluous, and should be removed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2157884">SERVER-70502</key>
            <summary>Prevent data race in `NetworkInterfaceMock::NetworkOperation`</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="reo.kimura@mongodb.com">Reo Kimura</assignee>
                                    <reporter username="reo.kimura@mongodb.com">Reo Kimura</reporter>
                        <labels>
                            <label>tsan</label>
                    </labels>
                <created>Wed, 12 Oct 2022 19:00:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:31:59 +0000</updated>
                            <resolved>Fri, 14 Oct 2022 00:57:07 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4902438" author="xgen-internal-githook" created="Thu, 13 Oct 2022 22:23:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Reo Kimura&apos;, &apos;email&apos;: &apos;reo.kimura@mongodb.com&apos;, &apos;username&apos;: &apos;rkimura21&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70502&quot; title=&quot;Prevent data race in `NetworkInterfaceMock::NetworkOperation`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70502&quot;&gt;&lt;del&gt;SERVER-70502&lt;/del&gt;&lt;/a&gt; Prevent data race in `NetworkInterfaceMock::NetworkOperation`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f4eaf82b3fe424e771596ec2b4638fe50a434bb7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f4eaf82b3fe424e771596ec2b4638fe50a434bb7&lt;/a&gt;&lt;/p&gt;</comment>
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