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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-76546] _migrateClone can deadlock with prepared transactions on secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-76546</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The _migrateClone command &lt;a href=&quot;https://github.com/mongodb/mongo/blob/788248b98798044e325f30402ec3812a80dfbaf1/src/mongo/db/s/migration_chunk_cloner_source_legacy_commands.cpp#L140&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;isn&apos;t supposed to run on secondaries&lt;/a&gt;, but we perform no &lt;br/&gt;
checks for whether the node is currently primary after first admitting the command. If this command is still running while in the secondary state, it is possible for this deadlock to occur:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The command blocks on a prepared transaction while holding the PBWM lock&lt;/li&gt;
	&lt;li&gt;Oplog batch application blocks because the PBWM lock is held&lt;/li&gt;
	&lt;li&gt;Any attempt to end the prepared transaction would never be processed because oplog application is stuck.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Note that this deadlock requires the _migrateClone to start on a primary and then block on a prepared transaction after the node steps down to secondary.&lt;/p&gt;

&lt;p&gt;The issue can most easily be solved in one of two ways:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Fail the _migrateClone command after taking the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/537030bc588c260280a83fdda6e3c55f9acca9ff/src/mongo/db/s/migration_chunk_cloner_source_legacy_commands.cpp#L173&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AutoGetActiveCloner&lt;/a&gt;  and checking that the node is still primary. This helper takes the AutoGetCollection, which in turn takes the RSTL so that we can guarantee the node stays primary while it is in scope.&lt;/li&gt;
	&lt;li&gt;If for some reason we want this command to proceed while secondary, we could use AutoGetCollectionForRead or AutoGetCollectionForReadLockFree, which both &lt;a href=&quot;https://github.com/mongodb/mongo/blob/537030bc588c260280a83fdda6e3c55f9acca9ff/src/mongo/db/db_raii.cpp#L453&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;skip taking the PBWM lock&lt;/a&gt;.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2324621">SERVER-76546</key>
            <summary>_migrateClone can deadlock with prepared transactions on secondaries</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>sharding-nyc-subteam1</label>
                    </labels>
                <created>Wed, 26 Apr 2023 13:13:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:28 +0000</updated>
                            <resolved>Wed, 17 May 2023 19:44:50 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>5.0.19</fixVersion>
                    <fixVersion>7.0.0-rc6</fixVersion>
                    <fixVersion>6.0.8</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5522394" author="xgen-internal-githook" created="Fri, 23 Jun 2023 21:02:48 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76546&quot; title=&quot;_migrateClone can deadlock with prepared transactions on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76546&quot;&gt;&lt;del&gt;SERVER-76546&lt;/del&gt;&lt;/a&gt; _migrateClone can deadlock with prepared transactions on secondaries&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e90dcb18de438b6b6ab02b2c921463fd35b866cb)&lt;br/&gt;
(cherry picked from commit 623c3ea57d5222d79c2e3d68ec94485f183fe35d)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1297e894f5323d28e6236f67a7d9a9e40bdc8c6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1297e894f5323d28e6236f67a7d9a9e40bdc8c6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5516528" author="xgen-internal-githook" created="Wed, 21 Jun 2023 19:46:09 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76546&quot; title=&quot;_migrateClone can deadlock with prepared transactions on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76546&quot;&gt;&lt;del&gt;SERVER-76546&lt;/del&gt;&lt;/a&gt; _migrateClone can deadlock with prepared transactions on secondaries&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e90dcb18de438b6b6ab02b2c921463fd35b866cb)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/623c3ea57d5222d79c2e3d68ec94485f183fe35d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/623c3ea57d5222d79c2e3d68ec94485f183fe35d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5515778" author="xgen-internal-githook" created="Wed, 21 Jun 2023 16:17:01 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76546&quot; title=&quot;_migrateClone can deadlock with prepared transactions on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76546&quot;&gt;&lt;del&gt;SERVER-76546&lt;/del&gt;&lt;/a&gt; _migrateClone can deadlock with prepared transactions on secondaries&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e90dcb18de438b6b6ab02b2c921463fd35b866cb)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f568805ae0329f0d4be6a320cde750bc15b9701d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f568805ae0329f0d4be6a320cde750bc15b9701d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5433001" author="xgen-internal-githook" created="Wed, 17 May 2023 19:38:43 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76546&quot; title=&quot;_migrateClone can deadlock with prepared transactions on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76546&quot;&gt;&lt;del&gt;SERVER-76546&lt;/del&gt;&lt;/a&gt; _migrateClone can deadlock with prepared transactions on secondaries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e90dcb18de438b6b6ab02b2c921463fd35b866cb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e90dcb18de438b6b6ab02b2c921463fd35b866cb&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="2343781">SERVER-77242</issuekey>
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            <issuekey id="2173451">SERVER-71028</issuekey>
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