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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-59516] Create opCtx outside of lock in oplog fetcher</title>
                <link>https://jira.mongodb.org/browse/SERVER-59516</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the &lt;tt&gt;OplogFetcher&lt;/tt&gt;, we should create the opCtx before we obtain the lock &lt;a href=&quot;https://github.com/10gen/mongo/blob/5b7a53f6b59820fc66c24cd53a747ec7d6a3b3e7/src/mongo/db/repl/oplog_fetcher.cpp#L433-L434&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Since destructors are called in reverse order, the current code tries to destruct the opCtx when it goes out of scope before releasing the lock. This leads to a potential deadlock situation with tenant migrations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1858481">SERVER-59516</key>
            <summary>Create opCtx outside of lock in oplog fetcher</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="xuerui.fa@mongodb.com">Xuerui Fa</assignee>
                                    <reporter username="xuerui.fa@mongodb.com">Xuerui Fa</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Aug 2021 21:55:23 +0000</created>
                <updated>Sun, 29 Oct 2023 21:49:16 +0000</updated>
                            <resolved>Tue, 24 Aug 2021 19:16:23 +0000</resolved>
                                                    <fixVersion>5.0.3</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4106601" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 17:29:18 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4027392" author="xgen-internal-githook" created="Fri, 27 Aug 2021 19:46:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;XueruiFa&apos;, &apos;email&apos;: &apos;xuerui.fa@mongodb.com&apos;, &apos;username&apos;: &apos;XueruiFa&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59516&quot; title=&quot;Create opCtx outside of lock in oplog fetcher&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59516&quot;&gt;&lt;del&gt;SERVER-59516&lt;/del&gt;&lt;/a&gt;: Create opCtx outside of lock in oplog fetcher&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8c345c6693b6b60947f5134cb76efdf4500258dd)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3b0aa61b3e9737ba37a69e3e156722e3ea088e12&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3b0aa61b3e9737ba37a69e3e156722e3ea088e12&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4021860" author="daniel.gottlieb@10gen.com" created="Wed, 25 Aug 2021 14:43:19 +0000"  >&lt;blockquote&gt;
&lt;p&gt;the current code tries to destruct the opCtx when it goes out of scope before releasing the lock. This leads to a potential deadlock situation with tenant migrations.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xuerui.fa&quot; class=&quot;user-hover&quot; rel=&quot;xuerui.fa&quot;&gt;xuerui.fa&lt;/a&gt; Can you expand some on this? I imagine this means that destructing an OperationContext can acquire* resources? If that&apos;s so, can you point me to the code that does that?&lt;/p&gt;</comment>
                            <comment id="4020130" author="xgen-internal-githook" created="Tue, 24 Aug 2021 19:04:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;XueruiFa&apos;, &apos;email&apos;: &apos;xuerui.fa@mongodb.com&apos;, &apos;username&apos;: &apos;XueruiFa&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59516&quot; title=&quot;Create opCtx outside of lock in oplog fetcher&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59516&quot;&gt;&lt;del&gt;SERVER-59516&lt;/del&gt;&lt;/a&gt;: Create opCtx outside of lock in oplog fetcher&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8c345c6693b6b60947f5134cb76efdf4500258dd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8c345c6693b6b60947f5134cb76efdf4500258dd&lt;/a&gt;&lt;/p&gt;</comment>
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