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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-67382] Race condition in the UUID &lt;-&gt; NSS resolution in the multi-collection locking path</title>
                <link>https://jira.mongodb.org/browse/SERVER-67382</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since our lock manager works based on namespaces and not UUIDs, there is an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b06eb97f6f440a52010eef40f1da7af5fa3a2a0f/src/mongo/db/concurrency/d_concurrency.cpp#L309&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;optimistic&quot; protocol&lt;/a&gt; which ensures that a UUID is locked exactly as the namespace that it maps to. The protocol is:&lt;/p&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;do {&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;  NSSBeforeLock = optimistically resolve NSS to UUID;&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;  Lock the NSS();&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;  NSSAfterLock = optimistically resolve NSS to UUID;&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;while (NSSBeforeLock == NSSAfterLock);&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;The above protocol guarantees that when one holds an &lt;tt&gt;AutoGetCollection&lt;/tt&gt; object, the NSS &amp;lt;-&amp;gt; UUID mapping reflects the truth and is stable for the duration of the RAII object.&lt;/p&gt;

&lt;p&gt;The multi-collection locking path performs the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b06eb97f6f440a52010eef40f1da7af5fa3a2a0f/src/mongo/db/catalog_raii.cpp#L145&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;UUID -&amp;gt; NSS resolution&lt;/a&gt; before it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b06eb97f6f440a52010eef40f1da7af5fa3a2a0f/src/mongo/db/catalog_raii.cpp#L151&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invokes the &lt;tt&gt;CollectionLock&lt;/tt&gt; constructor&lt;/a&gt; (which is what implements the protocol above) and as a result it is possible that the guarantee above is not met. This is easily reproducible if the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b06eb97f6f440a52010eef40f1da7af5fa3a2a0f/src/mongo/db/catalog_raii.cpp#L251&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;fast&quot; path here&lt;/a&gt; is skipped.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2072491">SERVER-67382</key>
            <summary>Race condition in the UUID &lt;-&gt; NSS resolution in the multi-collection locking path</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 20 Jun 2022 11:28:57 +0000</created>
                <updated>Sun, 29 Oct 2023 21:36:41 +0000</updated>
                            <resolved>Mon, 11 Jul 2022 19:53:01 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4671673" author="xgen-internal-githook" created="Mon, 11 Jul 2022 19:35:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67382&quot; title=&quot;Race condition in the UUID &amp;lt;-&amp;gt; NSS resolution in the multi-collection locking path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67382&quot;&gt;&lt;del&gt;SERVER-67382&lt;/del&gt;&lt;/a&gt; Refresh the catalog before re-checking UUID &amp;lt;-&amp;gt; NSS resolution in the multi-collection locking path&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e222ff7a8f10197d3e4977405216cfd2b852475d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e222ff7a8f10197d3e4977405216cfd2b852475d&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2072493">SERVER-67383</issuekey>
        </issuelink>
                            </inwardlinks>
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