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    <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-73266] Deadlock among createIndexes, index build commit, and step down</title>
                <link>https://jira.mongodb.org/browse/SERVER-73266</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to commit, an index build &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8dc2b488b02da893742bd818b8d8c497a9eaec71/src/mongo/db/index_builds_coordinator.cpp#L2831&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;takes an X lock on its on its collection&lt;/a&gt; after &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8dc2b488b02da893742bd818b8d8c497a9eaec71/src/mongo/db/index_builds_coordinator.cpp#L2825-L2827&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explicitly unlocking the RSTL&lt;/a&gt;. Then a &lt;tt&gt;createIndexes&lt;/tt&gt; command &lt;a href=&quot;https://github.com/mongodb/mongo/blob/73288a29338cee5bce896493a440ab968a9c6fb9/src/mongo/db/commands/create_indexes_cmd.cpp#L164&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;enqueues a collection IS lock&lt;/a&gt; (which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8dc2b488b02da893742bd818b8d8c497a9eaec71/src/mongo/db/concurrency/d_concurrency.cpp#L160&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;implicitly takes the RSTL in IX&lt;/a&gt;) in order to check the TTL options on the command object. Now a step down occurs, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8dc2b488b02da893742bd818b8d8c497a9eaec71/src/mongo/db/repl/replication_coordinator_impl_heartbeat.cpp#L551-L552&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;enqueuing the RSTL in mode X&lt;/a&gt;. Now the index build &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8dc2b488b02da893742bd818b8d8c497a9eaec71/src/mongo/db/index_builds_coordinator.cpp#L2832-L2833&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;attempts to take a collection IX lock on the &lt;tt&gt;config.system.indexBuilds&lt;/tt&gt; collection&lt;/a&gt;, which first enqueues the RSTL in IX since it was previously unlocked. Thus a three-way deadlock has been reached. It seems the issue is that we should be waiting to re-acquire the RSTL until the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8dc2b488b02da893742bd818b8d8c497a9eaec71/src/mongo/db/index_builds_coordinator.cpp#L2835-L2853&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;subsequent timeout-retry logic&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2242366">SERVER-73266</key>
            <summary>Deadlock among createIndexes, index build commit, and step down</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="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Jan 2023 20:33:09 +0000</created>
                <updated>Sun, 29 Oct 2023 21:27:29 +0000</updated>
                            <resolved>Tue, 31 Jan 2023 20:00:37 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                    <fixVersion>6.0.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5160108" author="xgen-internal-githook" created="Wed, 1 Feb 2023 19:59:11 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73266&quot; title=&quot;Deadlock among createIndexes, index build commit, and step down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73266&quot;&gt;&lt;del&gt;SERVER-73266&lt;/del&gt;&lt;/a&gt; Avoid retaking RSTL without timeout at index build commit&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 35370b26c155a89a540137fe168da98175a431bf)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e0fd004387a3ec6668f0a3dfba9c5cdbbf1be71f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e0fd004387a3ec6668f0a3dfba9c5cdbbf1be71f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5156114" author="xgen-internal-githook" created="Tue, 31 Jan 2023 19:59:53 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73266&quot; title=&quot;Deadlock among createIndexes, index build commit, and step down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73266&quot;&gt;&lt;del&gt;SERVER-73266&lt;/del&gt;&lt;/a&gt; Avoid retaking RSTL without timeout at index build commit&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/35370b26c155a89a540137fe168da98175a431bf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/35370b26c155a89a540137fe168da98175a431bf&lt;/a&gt;&lt;/p&gt;</comment>
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