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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-66439] Concurrent `checkIfOptionsConflict` running while state doc is being updated</title>
                <link>https://jira.mongodb.org/browse/SERVER-66439</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When we create a DDL coordinator we may run &lt;a href=&quot;https://github.com/10gen/mongo/blob/c6c851e12e1a590b9a974e7da7c1cd2869ce470d/src/mongo/db/s/sharding_ddl_coordinator_service.cpp#L308-L310&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checkIfOptionsConflict&lt;/a&gt; on the existing coordinator while it&apos;s running, which might be in the point of updating the state document, for example &lt;a href=&quot;https://github.com/10gen/mongo/blob/c6c851e12e1a590b9a974e7da7c1cd2869ce470d/src/mongo/db/s/collmod_coordinator.cpp#L288&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. This update may result in part of the original state doc&apos;s memory freed. However, the concurrent `checkIfOptionsConflict` may be still accessing this freed memory, hence causing a crash.&lt;/p&gt;

&lt;p&gt;This problem might not be exposed to other DDL coordinators yet because `collModRequest` has more complicated internal structure like `std::vector&amp;lt;...&amp;gt;`, which we believe is being freed during the update, since the serialization code uses the reference of the vector instead of making a copy. That said, this seems to be generic sharding DDL coordinator problem that probably should be handled in a general way.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2045881">SERVER-66439</key>
            <summary>Concurrent `checkIfOptionsConflict` running while state doc is being updated</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="rui.liu@mongodb.com">Rui Liu</reporter>
                        <labels>
                    </labels>
                <created>Thu, 12 May 2022 16:18:46 +0000</created>
                <updated>Tue, 6 Dec 2022 00:07:09 +0000</updated>
                            <resolved>Fri, 13 May 2022 12:52:45 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4547276" author="JIRAUSER1261330" created="Fri, 13 May 2022 12:53:58 +0000"  >&lt;p&gt;Sorry, seems this ticket is a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62432&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-62432&lt;/a&gt;, closing it.&lt;/p&gt;</comment>
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