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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47162] aggregate() namespace resolution and collMod are not synchronized (anymore)</title>
                <link>https://jira.mongodb.org/browse/SERVER-47162</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since we no longer take a DB MODE_X lock for collMod (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46865&quot; title=&quot;collMod should not take database MODE_X lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46865&quot;&gt;&lt;del&gt;SERVER-46865&lt;/del&gt;&lt;/a&gt;), the code for resolving namespaces in aggregate(), which takes a DB MODE_IS lock, does not necessarily see a consistent &quot;view&quot; of the view catalog. See &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f73a9645f68107d856bc882ad9e3fcdb0ee2f2ed/src/mongo/db/commands/run_aggregate.cpp#L259&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;link&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This means that aggregate() can execute a pipeline on a set of view definitions that are not valid/nonsensical and possibly even contain a cycle.&lt;/p&gt;

&lt;p&gt;One potential fix would be to have the view resolution in run_aggregate be performed while holding a collection IS lock on system.views. I believe this will fix the issue as long as collMod continues taking a collection X lock (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37a559ade62d693b2b85d75ecb9cdc2411a7d69f/src/mongo/db/catalog/coll_mod.cpp#L276-L277&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1294471">SERVER-47162</key>
            <summary>aggregate() namespace resolution and collMod are not synchronized (anymore)</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="13203">Gone away</resolution>
                                        <assignee username="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Fri, 27 Mar 2020 20:36:54 +0000</created>
                <updated>Fri, 27 Oct 2023 20:42:17 +0000</updated>
                            <resolved>Wed, 1 Apr 2020 17:17:17 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3021426" author="gregory.noma" created="Wed, 1 Apr 2020 17:17:55 +0000"  >&lt;p&gt;This will be fixed as a part of an updated version of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46865&quot; title=&quot;collMod should not take database MODE_X lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46865&quot;&gt;&lt;del&gt;SERVER-46865&lt;/del&gt;&lt;/a&gt;, so closing as Gone Away.&lt;/p&gt;</comment>
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