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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-70438] AutoGetCollection can return a valid collection and null database  </title>
                <link>https://jira.mongodb.org/browse/SERVER-70438</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;AutoGetCollection first takes AutoGetDb, and later performs a collection lookup in the catalog.&#160;&lt;/p&gt;

&lt;p&gt;These opens the possibility for two operations that run concurrently, such that one of them creates the database and the collection, and another takes an AutoGetCollection, to cause an AutoGetCollection to return a valid collection pointer, but a null database pointer. This is something unexpected, as the assumption is that if the collection exists, the database exists.&lt;/p&gt;

&lt;p&gt;Do we want to do something about this?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Create&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Other&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&#160;&lt;/li&gt;
&lt;/ul&gt;
&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;AutoGetCollection&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&#160;&lt;/li&gt;
&lt;/ul&gt;
&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;gt; AutoGetDb (_db = 0x0)&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;AutoGetCollection&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;gt; AutoGetDb&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;gt; acquire collection locks&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;gt; _coll = lookupCollection&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;create database&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;create collection&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;commit&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
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	&lt;li&gt;&#160;&lt;/li&gt;
&lt;/ul&gt;
&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;gt; acquire collection locks&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&#160;&lt;/li&gt;
&lt;/ul&gt;
&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;gt; _coll = lookupCollection&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&#160;&lt;/li&gt;
&lt;/ul&gt;
&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;if(autoColl) succeeds&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&#160;&lt;/li&gt;
&lt;/ul&gt;
&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;autoColl.getDb() null&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2156314">SERVER-70438</key>
            <summary>AutoGetCollection can return a valid collection and null database  </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="yujin.kang@mongodb.com">Yujin Kang Park</assignee>
                                    <reporter username="yujin.kang@mongodb.com">Yujin Kang Park</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Oct 2022 09:53:34 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:04 +0000</updated>
                            <resolved>Mon, 19 Dec 2022 10:40:42 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5058125" author="xgen-internal-githook" created="Thu, 15 Dec 2022 17:50:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yu Jin Kang Park&apos;, &apos;email&apos;: &apos;yujin.kang@mongodb.com&apos;, &apos;username&apos;: &apos;ykangpark&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70438&quot; title=&quot;AutoGetCollection can return a valid collection and null database  &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70438&quot;&gt;&lt;del&gt;SERVER-70438&lt;/del&gt;&lt;/a&gt; Fix AutoGetCollection containing a valid coll reference and an invalid db reference&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5a3eb14ded9ae4c5c85a03fc538a7dbc0533f9b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5a3eb14ded9ae4c5c85a03fc538a7dbc0533f9b&lt;/a&gt;&lt;/p&gt;</comment>
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