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    <title>MongoDB Jira</title>
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    <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-76829] Calling `setAllowMigrations` with a session while the balancer is enabled may result in deadlock</title>
                <link>https://jira.mongodb.org/browse/SERVER-76829</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73539&quot; title=&quot;stopMigrations/resumeMigrations don&amp;#39;t have replay protection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73539&quot;&gt;&lt;del&gt;SERVER-73539&lt;/del&gt;&lt;/a&gt; introduced replay protection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3f9a346c19b65d8e110080bd8109cdf7be103cc1/src/mongo/db/s/rename_collection_coordinator.cpp#L337-L344&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when calling stopMigrations&lt;/a&gt; from the rename coordinator.&lt;/p&gt;

&lt;p&gt;The flow of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3f9a346c19b65d8e110080bd8109cdf7be103cc1/src/mongo/db/s/sharding_ddl_util.cpp#L274-L287&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setAllowMigrations&lt;/a&gt; is the following:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Shard (DDL coordinator) asks the CSRS to stop migrations&lt;/li&gt;
	&lt;li&gt;CSRS updates the collection&apos;s metadata and then asks every shard to:
	&lt;ol&gt;
		&lt;li&gt;Abort current migrations&lt;/li&gt;
		&lt;li&gt;Refresh the routing table&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Step (1) is performed with a session checked out and may get executed while a migration for one of the collections involved in the rename is happening on the same node the DDL coordinator runs on. In that case, the lsid will get propagated down until step (2.1) that will get stuck trying to checkout the same session.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2331742">SERVER-76829</key>
            <summary>Calling `setAllowMigrations` with a session while the balancer is enabled may result in deadlock</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Thu, 4 May 2023 08:19:04 +0000</created>
                <updated>Thu, 4 May 2023 12:57:51 +0000</updated>
                            <resolved>Thu, 4 May 2023 11:39:31 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5400221" author="pierlauro.sciarelli" created="Thu, 4 May 2023 11:38:53 +0000"  >&lt;p&gt;It actually turns out that the underlying issue is &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76720&quot; title=&quot;Chunk Migration migrates the session history for the migrating session leading to a deadlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76720&quot;&gt;&lt;del&gt;SERVER-76720&lt;/del&gt;&lt;/a&gt; , so closing as &quot;incorrect&quot;&lt;/p&gt;</comment>
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