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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-40171] Potential deadlock while migrating sessions</title>
                <link>https://jira.mongodb.org/browse/SERVER-40171</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;SessionCatalogMigrationSource::_fetchNextNewWriteOplog() uses a DBDirectClient to do a query on the oplog. This is called after obtaining a lock as part of the AutoGetActiveCloner. &lt;br/&gt;
Attempting to read the oplog through the query system will end up calling waitForAllEarlierOplogWritesToBeVisible(). This will result in deadlocks sometimes, as there could be oplog writes that cannot become visible because they committed prior to some blocked uncommitted transaction that is blocked by the problematic code (thus completing the circle of deadlocks.)&lt;/p&gt;

&lt;p&gt;The possible change _fetchNextNewWriteOplog() to not use a DBDirectClient.&lt;/p&gt;</description>
                <environment></environment>
        <key id="717530">SERVER-40171</key>
            <summary>Potential deadlock while migrating sessions</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="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 15 Mar 2019 18:25:31 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:54 +0000</updated>
                            <resolved>Thu, 16 May 2019 13:30:52 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2248737" author="xgen-internal-githook" created="Thu, 16 May 2019 13:26:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;golden.janna@gmail.com&apos;, &apos;name&apos;: &apos;jannaerin&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40171&quot; title=&quot;Potential deadlock while migrating sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40171&quot;&gt;&lt;del&gt;SERVER-40171&lt;/del&gt;&lt;/a&gt; Release collection lock when fetching next oplog in _getNextSessionMods&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bd0324546f6ca94d211130264c3774146cc1399b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bd0324546f6ca94d211130264c3774146cc1399b&lt;/a&gt;&lt;/p&gt;</comment>
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