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    <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-39347] Race in catalog cache loader</title>
                <link>https://jira.mongodb.org/browse/SERVER-39347</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8387824b3ac937b0489fcb94c590cc663b47348c/src/mongo/s/catalog_cache.cpp#L387-L391&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CatalogCache::checkEpochOrThrow()&lt;/a&gt; we check if there pointer to &lt;tt&gt;routingInfo&lt;/tt&gt; associated with a collection is non-null. &lt;/p&gt;

&lt;p&gt;In &lt;tt&gt;_scheduleCollectionRefresh()&lt;/tt&gt; (which may run at the same time as a call to &lt;tt&gt;checkEpochOrThrow()&lt;/tt&gt;), we std::move() from &lt;tt&gt;collEntry-&amp;gt;routingInfo&lt;/tt&gt;. See &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8387824b3ac937b0489fcb94c590cc663b47348c/src/mongo/s/catalog_cache.cpp#L546&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. (Keep in mind that std::move()ing from a shared pointer will &quot;transfer&quot; the reference count to the left hand side, and set the right hand side to nullptr).&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;routingInfo&lt;/tt&gt; is reset once the refresh has completed &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8387824b3ac937b0489fcb94c590cc663b47348c/src/mongo/s/catalog_cache.cpp#L643&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. This means that  in the period during which the refresh is happening (after we&apos;ve scheduled the refresh, dropped the mutex, and are waiting for the background thread &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8387824b3ac937b0489fcb94c590cc663b47348c/src/mongo/s/catalog_cache.cpp#L245&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;), the collection&apos;s &lt;tt&gt;routingInfo&lt;/tt&gt; will be nullptr, so it will appear to be unsharded.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="682268">SERVER-39347</key>
            <summary>Race in catalog cache loader</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="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Feb 2019 20:49:36 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:29 +0000</updated>
                            <resolved>Wed, 6 Feb 2019 19:22:10 +0000</resolved>
                                                    <fixVersion>4.1.8</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2140197" author="xgen-internal-githook" created="Wed, 6 Feb 2019 19:21:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ian Boros&apos;, &apos;email&apos;: &apos;puppyofkosh@gmail.com&apos;, &apos;username&apos;: &apos;puppyofkosh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39347&quot; title=&quot;Race in catalog cache loader&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39347&quot;&gt;&lt;del&gt;SERVER-39347&lt;/del&gt;&lt;/a&gt; fix race in CatalogCache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f1b64f7fa6b071cde41498961c147b533893ad33&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f1b64f7fa6b071cde41498961c147b533893ad33&lt;/a&gt;&lt;/p&gt;</comment>
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