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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-66930] Improve handling of performing operations on a collection after dropping it in the same WUOW</title>
                <link>https://jira.mongodb.org/browse/SERVER-66930</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you drop a collection and then insert into that collection (or potentially perform some other operation) in the same WUOW, when the &lt;tt&gt;onCommit&lt;/tt&gt; handlers run there will be a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0dae18bfa7ecba8820f032a0a53efa6cc02e4b0c/src/mongo/db/catalog/collection_impl.cpp#L857-L858&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;heap-use-after-free&lt;/a&gt; because the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0dae18bfa7ecba8820f032a0a53efa6cc02e4b0c/src/mongo/db/catalog/collection_impl.h#L597&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;CollectionImpl::_shared&lt;/tt&gt;&lt;/a&gt; was already destructed by the &lt;tt&gt;onCommit&lt;/tt&gt; of the drop.&lt;/p&gt;

&lt;p&gt;The heap-use-after-free could be fixed easily by capturing &lt;tt&gt;CollectionImpl::_shared&lt;/tt&gt; by value in the &lt;tt&gt;onCommit&lt;/tt&gt; handlers, but I think conceptually this order of operations shouldn&apos;t have this behavior; since the insert came after the drop, it doesn&apos;t make sense to &quot;insert&quot; into the dropped collection.&lt;/p&gt;

&lt;p&gt;Another option could be to make an implicit collection creation occur in this case, however I think this could result in some subtle confusing behavior. The caller may be trying to drop a collection that it had previously created with some special settings, but then after the drop seemingly succeeded it would be recreated with default settings.&lt;/p&gt;

&lt;p&gt;A third option is to make this a more obvious failure so that callers know to not do this. Currently this misbehavior is only consistently observed on ASAN builds. If we explicitly disallow operating on a collection in the same WUOW after dropping it, these misuses can be caught earlier.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2059758">SERVER-66930</key>
            <summary>Improve handling of performing operations on a collection after dropping it in the same WUOW</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Jun 2022 16:11:32 +0000</created>
                <updated>Wed, 26 Apr 2023 20:53:14 +0000</updated>
                                                                                                <votes>0</votes>
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