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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-25681] ViewDefinitions obtained from ViewCatalog are freed on reload</title>
                <link>https://jira.mongodb.org/browse/SERVER-25681</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ol&gt;
	&lt;li&gt;Thread A calls ViewCatalog::lookup() and obtains a raw ViewDefinition*.&lt;/li&gt;
	&lt;li&gt;Thread B inserts a valid view directly into system.views. ViewCatalog::_valid is marked as false. (Note that this insert is possible because Thread A locks the database in MODE_IS, which does not conflict with a MODE_IX lock obtained by Thread B. Other commands that modify the view definitions require a MODE_X lock; i.e. create, collMod, drop.)&lt;/li&gt;
	&lt;li&gt;Thread C calls a method of ViewCatalog, which implicitly reloads the catalog, clearing the old ViewMap, freeing all of the old ViewDefinitions.&lt;/li&gt;
	&lt;li&gt;All iterators to the old ViewMap are now invalidated and all the ViewDefinition pointers have been freed, but Thread A might still be holding onto the ViewDefinition and may try to use it, resulting in undefined behavior.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="310001">SERVER-25681</key>
            <summary>ViewDefinitions obtained from ViewCatalog are freed on reload</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="9">Done</resolution>
                                        <assignee username="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>read-only-views</label>
                    </labels>
                <created>Thu, 18 Aug 2016 02:38:02 +0000</created>
                <updated>Fri, 2 Sep 2016 00:29:28 +0000</updated>
                            <resolved>Fri, 19 Aug 2016 17:17:09 +0000</resolved>
                                                    <fixVersion>3.3.12</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1362287" author="xgen-internal-githook" created="Fri, 19 Aug 2016 17:16:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25681&quot; title=&quot;ViewDefinitions obtained from ViewCatalog are freed on reload&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25681&quot;&gt;&lt;del&gt;SERVER-25681&lt;/del&gt;&lt;/a&gt; fix ViewCatalog reload race&lt;/p&gt;

&lt;p&gt;Changes ViewCatalog::lookup() to return a shared_ptr&amp;lt;ViewDefinition&amp;gt; rather than&lt;br/&gt;
a bare pointer, allowing the view definitions to persist even if the ViewCatalog&lt;br/&gt;
is reloaded.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1343dfdac48d148b0a72fc9aa4af23a7191082cd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1343dfdac48d148b0a72fc9aa4af23a7191082cd&lt;/a&gt;&lt;/p&gt;</comment>
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