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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-32574] Repairing the local database can cause the WT oplog manager thread to permanently exit.</title>
                <link>https://jira.mongodb.org/browse/SERVER-32574</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;WiredTigerOplogManager&apos;s&lt;/tt&gt; purpose is to advance oplog visibility. Without it, a node can stop responding to requests. The &lt;tt&gt;WiredTigerOplogManager&lt;/tt&gt; will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/025d4f4fe6/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L327&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;only be constructed once&lt;/a&gt;, its lifetime bound by the &lt;tt&gt;WiredTigerKVEngine&lt;/tt&gt;. However the background thread that manages oplog visibility starts and stops as the oplog is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/025d4f4fe6/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L717-L720&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;created&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/025d4f4fe6/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L673-L676&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;destroyed&lt;/a&gt;. I&apos;m not justifying these details, just stating them, &lt;/p&gt;

&lt;p&gt;There was an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/025d4f4fe6/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L1140&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;assumption that the oplog manager would never be restarted in production&lt;/a&gt;. That assumption was not true. Repairing the &lt;tt&gt;local&lt;/tt&gt; database will recreate the oplog record store. When the record store is destroyed, the background thread is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/025d4f4fe6/src/mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.cpp#L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;halted&lt;/a&gt;. When the record store is recreated, the thread is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/025d4f4fe6/src/mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.cpp#L71-L79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;restarted&lt;/a&gt;. However, restarting has a race. The thread may start and read &lt;tt&gt;_shuttingDown&lt;/tt&gt; to be true before the spawning thread resets it back to &lt;tt&gt;false&lt;/tt&gt;. This will cause the newly spawned thread to incorrectly shutdown.&lt;/p&gt;</description>
                <environment></environment>
        <key id="479704">SERVER-32574</key>
            <summary>Repairing the local database can cause the WT oplog manager thread to permanently exit.</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Sun, 7 Jan 2018 02:29:51 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:31 +0000</updated>
                            <resolved>Tue, 23 Jan 2018 16:30:58 +0000</resolved>
                                                    <fixVersion>3.6.4</fixVersion>
                    <fixVersion>3.7.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1817932" author="xgen-internal-githook" created="Wed, 28 Feb 2018 00:05:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;geert@mongodb.com&apos;, &apos;name&apos;: &apos;Geert Bosch&apos;, &apos;username&apos;: &apos;GeertBosch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32574&quot; title=&quot;Repairing the local database can cause the WT oplog manager thread to permanently exit.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32574&quot;&gt;&lt;del&gt;SERVER-32574&lt;/del&gt;&lt;/a&gt; Fix oplog thread restart race in local DB repair&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 7a800bc2edf646ff0df3fa2bb4975fd05bd41298)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/47a2ab3643cc9b3b1f00decfd3e8f3745283affc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/47a2ab3643cc9b3b1f00decfd3e8f3745283affc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1782288" author="xgen-internal-githook" created="Tue, 23 Jan 2018 16:30:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Geert Bosch&apos;, &apos;email&apos;: &apos;geert@mongodb.com&apos;, &apos;username&apos;: &apos;GeertBosch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32574&quot; title=&quot;Repairing the local database can cause the WT oplog manager thread to permanently exit.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32574&quot;&gt;&lt;del&gt;SERVER-32574&lt;/del&gt;&lt;/a&gt; Fix oplog thread restart race in local DB repair&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7a800bc2edf646ff0df3fa2bb4975fd05bd41298&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7a800bc2edf646ff0df3fa2bb4975fd05bd41298&lt;/a&gt;&lt;/p&gt;</comment>
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