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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>
    </build-info>


<item>
            <title>[SERVER-42494] Deadlock between aggregation pipeline and IndexBuildsCoordinator in storage engines that do not support document level locking</title>
                <link>https://jira.mongodb.org/browse/SERVER-42494</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The IndexBuildsCoordinator can get into a deadlock scenario the following way:&lt;br/&gt;
Thread 1:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Begin an index build on &lt;tt&gt;test.one&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Grab an intent lock on &lt;tt&gt;test&lt;/tt&gt; and an exclusive lock on &lt;tt&gt;test.one&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Grab the &lt;tt&gt;IndexBuildsCoordinator&lt;/tt&gt; mutex.&lt;/li&gt;
	&lt;li&gt;Initialize the &lt;tt&gt;MultiIndexBlock&lt;/tt&gt; calling &lt;tt&gt;init()&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Log the operation to the oplog (Grabs intent lock on &lt;tt&gt;local&lt;/tt&gt; and wait to grab intent lock on &lt;tt&gt;local.oplog.rs&lt;/tt&gt;. See logic in logOp() below.&lt;/li&gt;
&lt;/ul&gt;


&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; (!opCtx-&amp;gt;getServiceContext()-&amp;gt;getStorageEngine()-&amp;gt;supportsDocLocking()) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    dbWriteLock.emplace(opCtx, NamespaceString::kLocalDb, MODE_IX);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    collWriteLock.emplace(opCtx, oplogInfo-&amp;gt;getOplogCollectionName(), MODE_IX);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Thread 2:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;During the aggregation pipeline, run a rename command to rename a temporary collection.&lt;/li&gt;
	&lt;li&gt;Rename with source &lt;tt&gt;test.tmp.two&lt;/tt&gt; and target &lt;tt&gt;test.two&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Grab the intent lock on &lt;tt&gt;test&lt;/tt&gt; and exclusive locks on both &lt;tt&gt;tmp.two&lt;/tt&gt; and &lt;tt&gt;two&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Check if there are any ongoing index builds by calling &lt;tt&gt;IndexBuildsCoordinator:: assertNoIndexBuildInProgForCollection()&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Waits to grab the &lt;tt&gt;IndexBuildsCoordinator&lt;/tt&gt; mutex.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Since thread 1 is stuck waiting for an intent lock on &lt;tt&gt;local.oplog.rs&lt;/tt&gt; it must mean that thread 2 is holding an exclusive lock on &lt;tt&gt;local.oplog.rs&lt;/tt&gt; before running the rename command as I could not find any lock acquisitions for it during the rename call.&lt;/p&gt;</description>
                <environment></environment>
        <key id="879775">SERVER-42494</key>
            <summary>Deadlock between aggregation pipeline and IndexBuildsCoordinator in storage engines that do not support document level locking</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Jul 2019 13:33:25 +0000</created>
                <updated>Tue, 6 Dec 2022 02:52:14 +0000</updated>
                            <resolved>Mon, 5 Aug 2019 15:12:36 +0000</resolved>
                                                                    <component>Concurrency</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2357790" author="gregory.wlodarek" created="Mon, 5 Aug 2019 15:12:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dan.solnik&quot; class=&quot;user-hover&quot; rel=&quot;dan.solnik&quot;&gt;dan.solnik&lt;/a&gt;&apos;s work in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37720&quot; title=&quot;Allow active index builds during renameCollection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37720&quot;&gt;SERVER-37720&lt;/a&gt; will fix this deadlock as that code path that asserts no index builds are in progress will go away with his work.&lt;/p&gt;</comment>
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            <issuekey id="623348">SERVER-37720</issuekey>
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