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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-70873] Stepdown during drop collection can lead to a deadlock</title>
                <link>https://jira.mongodb.org/browse/SERVER-70873</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65016&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-65016&lt;/a&gt; a new code to remove the range deletion document was added as an optimization &lt;a href=&quot;https://github.com/mongodb/mongo/commit/774c0ba3616556db2d034675e5979c05611d43d9#diff-e6be1c2d6961e512ffeafbd083c375cf81fd6c95b58bdf5ed42534a30d6cf64e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;into the existing drop collection code&lt;/a&gt;, however, this code is using &lt;a href=&quot;https://github.com/10gen/mongo/blob/b129eab8cef833f56c29b3043e43773a4e080b51/src/mongo/db/s/drop_collection_coordinator.cpp#L79-L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an alternative client region&lt;/a&gt; in order to remove multiple documents, this is done because the shardsvr_drop_collection_participant &lt;a href=&quot;https://github.com/10gen/mongo/blob/b129eab8cef833f56c29b3043e43773a4e080b51/src/mongo/db/s/shardsvr_drop_collection_participant_command.cpp#L67-L69&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;uses the retryable write machinery&lt;/a&gt; to guard against replay protection. &lt;/p&gt;

&lt;p&gt;The unintended effect of this is that a thread that is dropping a collection will first checkout a session, and then, as part of taking the collection lock it will try to grab the RSTL lock when executing the DBClient command to remove the range deletion documents. If a stepdown sneaks in after the session is checked out, then the stepdown thread will grab the RSTL lock and then try to checkout and kill all running sessions, causing a deadlock.&lt;/p&gt;

&lt;p&gt;In the attached stacktrace log this situation can be seen between the Thread 2 and Thread 99. One way to solve this is to do create the operation context the same way the &lt;a href=&quot;https://github.com/10gen/mongo/blob/b129eab8cef833f56c29b3043e43773a4e080b51/src/mongo/db/s/config/configsvr_rename_collection_metadata_command.cpp#L108-L118&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;rename collection metadata command does&lt;/a&gt;, which is, linking the new operation context created in the alternative region to the parent cancellation token, this way, during the stepdown, &lt;a href=&quot;https://github.com/10gen/mongo/blob/ea546da6814f8f07e158c62447ce094c4b5b865e/src/mongo/db/repl/replication_coordinator_impl.cpp#L2721&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when the parent operation context is interrupted&lt;/a&gt;, the thread waiting for the lock will finish, liberating the session, allowing the shutdown thread to effectively checking it out.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2167675">SERVER-70873</key>
            <summary>Stepdown during drop collection can lead to 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="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Oct 2022 17:24:13 +0000</created>
                <updated>Sun, 29 Oct 2023 21:31:26 +0000</updated>
                            <resolved>Fri, 4 Nov 2022 12:36:12 +0000</resolved>
                                    <version>6.2.0-rc0</version>
                                    <fixVersion>6.2.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4954808" author="xgen-internal-githook" created="Fri, 4 Nov 2022 12:27:35 +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-70873&quot; title=&quot;Stepdown during drop collection can lead to a deadlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70873&quot;&gt;&lt;del&gt;SERVER-70873&lt;/del&gt;&lt;/a&gt; Use cancelable OperationContext in ACR to prevent deadlock with stepdowns&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f06a898557f951bf48569012c4372e770d1c0267&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f06a898557f951bf48569012c4372e770d1c0267&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2011065">SERVER-65016</issuekey>
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            <issuekey id="1881402">SERVER-60161</issuekey>
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