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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-75435] Investigate scope of _oplogPinnedByBackupMutex in WiredTigerKVEngine::beginNonBlockingBackupCursor() </title>
                <link>https://jira.mongodb.org/browse/SERVER-75435</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The _oplogPinnedByBackupMutex is locked and held for the majority of WiredTigerKVEngine::&lt;a href=&quot;https://github.com/10gen/mongo/blob/c4ff531484d888bc2b1eebb02a28df63e41a0437/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L1238-L1296&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;beginNonBlockingBackup&lt;/a&gt;()&lt;/p&gt;

&lt;p&gt;The mutex is locked before the &lt;a href=&quot;https://github.com/10gen/mongo/blob/c4ff531484d888bc2b1eebb02a28df63e41a0437/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L1271&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;trying to acquire the PBWM lock&lt;/a&gt;. We&apos;ve seen scenarios where minor changes to the oplog applier code path can introduce a deadlock where the oplog applier holds the PBWM lock while trying to check the &lt;a href=&quot;https://github.com/10gen/mongo/blob/c4ff531484d888bc2b1eebb02a28df63e41a0437/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L2457&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;oldest pinned timestamp&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In general, we should try to limit the scope of this mutex, and evaluate if the scope can be reduced to improve code safety.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2300740">SERVER-75435</key>
            <summary>Investigate scope of _oplogPinnedByBackupMutex in WiredTigerKVEngine::beginNonBlockingBackupCursor() </summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13203">Gone away</resolution>
                                        <assignee username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="haley.connelly@mongodb.com">Haley Connelly</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Mar 2023 12:29:01 +0000</created>
                <updated>Fri, 27 Oct 2023 20:44:49 +0000</updated>
                            <resolved>Fri, 5 May 2023 13:58:29 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5403808" author="JIRAUSER1264163" created="Fri, 5 May 2023 13:58:21 +0000"  >&lt;p&gt;It seems &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65974&quot; title=&quot;Replace HistoricalIdentTracker with checkpoint cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65974&quot;&gt;&lt;del&gt;SERVER-65974&lt;/del&gt;&lt;/a&gt; has removed the code that takes the GlobalLock. As a result it is now only trivially used to perform non-deadlockable actions. Closing as Gone Away&lt;/p&gt;</comment>
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            <issuekey id="2293820">SERVER-75107</issuekey>
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