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    <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-37398] Concurrent aggregations with $out on a shard server can deadlock with each other</title>
                <link>https://jira.mongodb.org/browse/SERVER-37398</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A single aggregation request with $out takes:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;the global lock in IS for a collection lock on the input collection from the&#160;&lt;b&gt;client&apos;s OperationContext&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;the global lock in IS for a collection lock on config.collections and config.chunks from the ShardServerCatalogCacheLoader from one of the&#160;&lt;b&gt;loader&apos;s OperationContexts&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;the global lock in X for&#160;renameIfOptionsAndIndexesHaveNotChanged() from the&#160;&lt;b&gt;client&apos;s OperationContext&lt;/b&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;b&gt;Enqueuing&lt;/b&gt;&#160;a global X lock request blocks all later global lock requests.&lt;/p&gt;

&lt;p&gt;So, if one agg request&apos;s global X lock request is enqueued in between a second agg request&apos;s two global IS lock requests, the three threads can deadlock.&lt;/p&gt;

&lt;p&gt;I think it also may be possible for &lt;b&gt;any&lt;/b&gt; operation that takes a global X lock to deadlock with a single agg with $out? I am not totally sure though, which is why I titled the ticket as I did for now.&lt;/p&gt;

&lt;p&gt;I am not sure whether this affects versions before master, so have just marked it as affecting 4.1.3 for now.&lt;/p&gt;</description>
                <environment></environment>
        <key id="611763">SERVER-37398</key>
            <summary>Concurrent aggregations with $out on a shard server can deadlock with each other</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 28 Sep 2018 22:04:54 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:46 +0000</updated>
                            <resolved>Wed, 14 Nov 2018 22:35:36 +0000</resolved>
                                    <version>4.1.3</version>
                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2062469" author="xgen-internal-githook" created="Wed, 14 Nov 2018 22:29:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37398&quot; title=&quot;Concurrent aggregations with $out on a shard server can deadlock with each other&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37398&quot;&gt;&lt;del&gt;SERVER-37398&lt;/del&gt;&lt;/a&gt; Prove $out can no longer deadlock&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd2b307956c44340d46fe05eabf5bbd08f96186c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd2b307956c44340d46fe05eabf5bbd08f96186c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2054544" author="charlie.swanson" created="Wed, 7 Nov 2018 15:28:42 +0000"  >&lt;p&gt; I&apos;m going to remove the &apos;is depended on by&apos; links and move them to &apos;related to links&apos;. BF-10750 and BF-10722 should have been resolved by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36813&quot; title=&quot;Test the defaulting of uniqueKey when the catalog cache is stale&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36813&quot;&gt;&lt;del&gt;SERVER-36813&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2054543" author="charlie.swanson" created="Wed, 7 Nov 2018 15:27:53 +0000"  >&lt;p&gt;Update: looks like &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36813&quot; title=&quot;Test the defaulting of uniqueKey when the catalog cache is stale&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36813&quot;&gt;&lt;del&gt;SERVER-36813&lt;/del&gt;&lt;/a&gt; removed the deadlock scenario (mostly by accident).&lt;/p&gt;</comment>
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