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    <title>MongoDB Jira</title>
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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-78021] Retrying setAllowMigrations command may end up in a deadlock</title>
                <link>https://jira.mongodb.org/browse/SERVER-78021</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Retrying the setAllowMigrations command with a session and a txnNum (retryableWrite:true) may end up with a deadlock, competing for a session checkout and the _kChunkOpLock acquisition, as it&apos;s shown below:&lt;/p&gt;

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

&lt;p&gt;First cmd: &lt;b&gt;&lt;font color=&quot;#008000&quot;&gt;session checkout&lt;/font&gt;&lt;/b&gt;&#160;&amp;gt;&#160;&lt;b&gt;&lt;font color=&quot;#008000&quot;&gt;lock _kChunkOpLock&lt;/font&gt;&lt;/b&gt;&#160;&amp;gt;&#160;&lt;b&gt;&lt;font color=&quot;#008000&quot;&gt;session check-in&lt;/font&gt;&lt;/b&gt;&#160;&amp;gt;&#160;&lt;b&gt;&lt;font color=&quot;#008000&quot;&gt;transaction happens&lt;/font&gt;&lt;/b&gt; &amp;gt;&#160;&lt;b&gt;&lt;font color=&quot;#ff0000&quot;&gt;session checkout&lt;/font&gt;&lt;/b&gt;&#160;&amp;gt; unlock _kChunkOpLock&lt;br/&gt;
Second cmd: &lt;b&gt;&lt;font color=&quot;#008000&quot;&gt;session checkout&lt;/font&gt;&lt;/b&gt;&#160;&amp;gt;&#160;&lt;b&gt;&lt;font color=&quot;#ff0000&quot;&gt;lock _kChunkOpLock&lt;/font&gt;&lt;/b&gt; &amp;gt; session check-in &amp;gt; transaction happens &amp;gt; session checkout &amp;gt; unlock _kChunkOpLock&lt;/p&gt;</description>
                <environment></environment>
        <key id="2366458">SERVER-78021</key>
            <summary>Retrying setAllowMigrations command may end up in a deadlock</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="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</assignee>
                                    <reporter username="silvia.surroca@mongodb.com">Silvia Surroca</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Jun 2023 09:50:02 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:08 +0000</updated>
                            <resolved>Thu, 6 Jul 2023 13:52:52 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5547085" author="xgen-internal-githook" created="Thu, 6 Jul 2023 13:08:56 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78021&quot; title=&quot;Retrying setAllowMigrations command may end up in a deadlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78021&quot;&gt;&lt;del&gt;SERVER-78021&lt;/del&gt;&lt;/a&gt; Prevent deadlock caused by session checkout and _chunkOpLock locking ordering&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5489c851ef1be132decab35f0545ecd977468b68&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5489c851ef1be132decab35f0545ecd977468b68&lt;/a&gt;&lt;/p&gt;</comment>
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