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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-57602] Deadlock between signalDrainComplete and operations acquiring the FCV lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-57602</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;ReplicationCoordinatorImpl::signalDrainComplete&lt;/tt&gt;&#160;takes the&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9c3588341bde307f0e65effd50ea6a7558044ae1/src/mongo/db/repl/replication_coordinator_impl.cpp#L1144-L1145&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;RSTL lock in X mode&lt;/a&gt;&#160;first before&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9c3588341bde307f0e65effd50ea6a7558044ae1/src/mongo/db/repl/replication_coordinator_impl.cpp#L3428&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquiring the FCV lock for reconfig&lt;/a&gt;. Based on&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33043&quot; title=&quot;Only setFCV should take the fcvLock (ResourceMutex) in exclusive mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33043&quot;&gt;&lt;del&gt;SERVER-33043&lt;/del&gt;&lt;/a&gt;, the FCV lock should be acquired before the global lock. I think this implies that the FCV lock should also be acquired before the RSTL lock. Because operation like&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9c3588341bde307f0e65effd50ea6a7558044ae1/src/mongo/db/s/shardsvr_rename_collection_command.cpp#L129&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt;&#160;would take the FCV lock first before getting the global / RSTL locks.&#160;&lt;tt&gt;FixedFCVRegion&lt;/tt&gt;&#160;has an&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9c3588341bde307f0e65effd50ea6a7558044ae1/src/mongo/db/commands/feature_compatibility_version.cpp#L579&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt;&#160;to check for that the global lock is not being held first. I think we should extend the invariant to check for RSTL lock as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1775001">SERVER-57602</key>
            <summary>Deadlock between signalDrainComplete and operations acquiring the FCV lock</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="jason.chan@mongodb.com">Jason Chan</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
                            <label>post-rc0</label>
                    </labels>
                <created>Thu, 10 Jun 2021 01:18:03 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:22 +0000</updated>
                            <resolved>Tue, 15 Jun 2021 20:02:13 +0000</resolved>
                                                    <fixVersion>5.0.0-rc2</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4107806" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:36:50 +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="3881269" author="xgen-internal-githook" created="Wed, 16 Jun 2021 14:41:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Chan&apos;, &apos;email&apos;: &apos;jason.chan@mongodb.com&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57602&quot; title=&quot;Deadlock between signalDrainComplete and operations acquiring the FCV lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57602&quot;&gt;&lt;del&gt;SERVER-57602&lt;/del&gt;&lt;/a&gt; Don&apos;t acquire FCV lock on reconfig triggered by signalDrainComplete()&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4d53dbd076f5d63197c88fe9509038a4b3c90055)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ace1746cc2640d5c862d9c7a4db7acd0c25eb75a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ace1746cc2640d5c862d9c7a4db7acd0c25eb75a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3880417" author="xgen-internal-githook" created="Wed, 16 Jun 2021 08:30:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Chan&apos;, &apos;email&apos;: &apos;jason.chan@mongodb.com&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57602&quot; title=&quot;Deadlock between signalDrainComplete and operations acquiring the FCV lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57602&quot;&gt;&lt;del&gt;SERVER-57602&lt;/del&gt;&lt;/a&gt; Don&apos;t acquire FCV lock on reconfig triggered by signalDrainComplete()&lt;br/&gt;
Branch: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34632&quot; title=&quot;config.chunks change to config.cache.chunks creates a collection long name after upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34632&quot;&gt;SERVER-34632&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4d53dbd076f5d63197c88fe9509038a4b3c90055&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4d53dbd076f5d63197c88fe9509038a4b3c90055&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3879488" author="xgen-internal-githook" created="Tue, 15 Jun 2021 19:58:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Chan&apos;, &apos;email&apos;: &apos;jason.chan@mongodb.com&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57602&quot; title=&quot;Deadlock between signalDrainComplete and operations acquiring the FCV lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57602&quot;&gt;&lt;del&gt;SERVER-57602&lt;/del&gt;&lt;/a&gt; Don&apos;t acquire FCV lock on reconfig triggered by signalDrainComplete()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4d53dbd076f5d63197c88fe9509038a4b3c90055&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4d53dbd076f5d63197c88fe9509038a4b3c90055&lt;/a&gt;&lt;/p&gt;</comment>
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