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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21527] Race between remove shard and access to database may cause NULL pointer crash</title>
                <link>https://jira.mongodb.org/browse/SERVER-21527</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ShardRegistry::getShard will return nullptr if the shard id is not found. In the steady state, the metadata should never contain a database which references a removed shard, because we drain the shard first and clear the cached metadata. However, in theory, there is a very narrow race condition where a query might be referencing a database entry, which points to a shard, which was just removed.&lt;/p&gt;</description>
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        <key id="240015">SERVER-21527</key>
            <summary>Race between remove shard and access to database may cause NULL pointer crash</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
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                <created>Wed, 18 Nov 2015 16:16:55 +0000</created>
                <updated>Tue, 6 Dec 2022 04:39:40 +0000</updated>
                            <resolved>Thu, 5 May 2016 17:40:51 +0000</resolved>
                                    <version>3.2.0-rc3</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1093871" author="xgen-internal-githook" created="Fri, 20 Nov 2015 01:20:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21527&quot; title=&quot;Race between remove shard and access to database may cause NULL pointer crash&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21527&quot;&gt;&lt;del&gt;SERVER-21527&lt;/del&gt;&lt;/a&gt; Cleanup usages of getShard for resolving host to shard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5b3257d526f8217e303609418da1769275f81d03&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5b3257d526f8217e303609418da1769275f81d03&lt;/a&gt;&lt;/p&gt;</comment>
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