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    <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-62379] Fix deadlock between ReplicationCoordinator and BackgroundSync on stepUp</title>
                <link>https://jira.mongodb.org/browse/SERVER-62379</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;ins&gt;&lt;b&gt;Bug:&lt;/b&gt;&lt;/ins&gt;&lt;br/&gt;
there&apos;s a deadlock in mongod between:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9ec1e6e58e94d52d2f6a9bc167ff939118aa5134/src/mongo/db/repl/replication_coordinator_impl_elect_v1.cpp#L402&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ReplicationCoordinatorImpl::ElectionState::_onVoteRequestComplete() holding the ReplicationCoordinatorImpl::_mutex&lt;/a&gt;&#160;and attempting to acquire the BackgroundSync::_mutex&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9ec1e6e58e94d52d2f6a9bc167ff939118aa5134/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L983&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when calling BackgroundSync::clearSyncTarget()&lt;/a&gt;, and&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9ec1e6e58e94d52d2f6a9bc167ff939118aa5134/src/mongo/db/repl/bgsync.cpp#L492-L502&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BackgroundSync::_produce() holding the BackgroundSync::_mutex and attempting to acquire the ReplicationCoordinatorImpl::_mutex when calling ReplicationCoordinatorImpl::getMyLastAppliedOpTime()&lt;/a&gt;.&lt;/li&gt;
&lt;/ul&gt;


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

&lt;p&gt;&lt;ins&gt;&lt;b&gt;Proposed fix:&lt;/b&gt;&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;We need to move&#160; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9ec1e6e58e94d52d2f6a9bc167ff939118aa5134/src/mongo/db/repl/bgsync.cpp#L502&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_replCoord-&amp;gt;getMyLastAppliedOpTime()&lt;/a&gt; before we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9ec1e6e58e94d52d2f6a9bc167ff939118aa5134/src/mongo/db/repl/bgsync.cpp#L492&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquire the mutex&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1959081">SERVER-62379</key>
            <summary>Fix deadlock between ReplicationCoordinator and BackgroundSync on stepUp</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="m.maher@mongodb.com">Moustafa Maher</assignee>
                                    <reporter username="m.maher@mongodb.com">Moustafa Maher</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Jan 2022 19:48:23 +0000</created>
                <updated>Sun, 29 Oct 2023 21:44:29 +0000</updated>
                            <resolved>Wed, 12 Jan 2022 17:22:48 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>5.0.7</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4365376" author="xgen-internal-githook" created="Sat, 19 Feb 2022 01:28:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Moustafa Maher Khalil&apos;, &apos;email&apos;: &apos;m.maher@mongodb.com&apos;, &apos;username&apos;: &apos;moustafamaher&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62379&quot; title=&quot;Fix deadlock between ReplicationCoordinator and BackgroundSync on stepUp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62379&quot;&gt;&lt;del&gt;SERVER-62379&lt;/del&gt;&lt;/a&gt; Fix deadlock between ReplicationCoordinator and BackgroundSync on stepUp&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/45d84929f04b99b882195c3b6c0333c91438e108&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/45d84929f04b99b882195c3b6c0333c91438e108&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4330959" author="JIRAUSER1257896" created="Wed, 2 Feb 2022 17:46:58 +0000"  >&lt;p&gt;Backport justification:&lt;br/&gt;
----------------------&lt;/p&gt;

&lt;p&gt;The bug is not too rare not to do it, it seems like it could happen when a node is stepping up and starting a new oplog fetcher at the same time.&lt;br/&gt;
The&#160;change itself is very non-invasive because we are not changing an old behavior we are just fixing the way (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50869&quot; title=&quot;Background sync may erroneously set applied-through during step-up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50869&quot;&gt;&lt;del&gt;SERVER-50869&lt;/del&gt;&lt;/a&gt;) works.&lt;/p&gt;</comment>
                            <comment id="4307224" author="JIRAUSER1257896" created="Fri, 21 Jan 2022 22:49:46 +0000"  >&lt;p&gt;This needs to batched to all versions containing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50869&quot; title=&quot;Background sync may erroneously set applied-through during step-up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50869&quot;&gt;&lt;del&gt;SERVER-50869&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4287022" author="xgen-internal-githook" created="Tue, 11 Jan 2022 22:16:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Moustafa Maher Khalil&apos;, &apos;email&apos;: &apos;m.maher@mongodb.com&apos;, &apos;username&apos;: &apos;moustafamaher&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62379&quot; title=&quot;Fix deadlock between ReplicationCoordinator and BackgroundSync on stepUp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62379&quot;&gt;&lt;del&gt;SERVER-62379&lt;/del&gt;&lt;/a&gt; Fix deadlock between ReplicationCoordinator and BackgroundSync on stepUp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/45188cb0dbf11e9559af07a910bedb8786372bc3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/45188cb0dbf11e9559af07a910bedb8786372bc3&lt;/a&gt;&lt;/p&gt;</comment>
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