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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-73755] Potential reference to freed stack variables in AutoGetCollection::getWritableCollection</title>
                <link>https://jira.mongodb.org/browse/SERVER-73755</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The AutoGetCollection utility has a very tightly coupled interdependency with CollectionWriter, in an attempt to make the committed catalog changes get reflected on an already instantiated stack object (introduced under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52877&quot; title=&quot;Use WUOW in write ops under global write lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52877&quot;&gt;&lt;del&gt;SERVER-52877&lt;/del&gt;&lt;/a&gt;). Specifically, it stores a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d9057c75bca0e1b25181742d9170fe53e34be85b/src/mongo/db/catalog_raii.cpp#L420&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;reference to the &lt;tt&gt;_coll&lt;/tt&gt; member&lt;/a&gt;&#160;into a commit/rollback handler.&lt;/p&gt;

&lt;p&gt;This requires that the WUOW&apos;s lifetime must always be subordinate to the AutoGetCollection&apos;s, which is not guaranteed to be the case with transactions. Therefore this pattern is very error-prone and can only possibly work in a very limited set of use cases.&lt;/p&gt;

&lt;p&gt;There is a large number of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d9057c75bca0e1b25181742d9170fe53e34be85b/src/mongo/db/repl/collection_bulk_loader_impl.cpp#L92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;users&lt;/a&gt; of the following pattern in order to work around the constness of some methods on &lt;tt&gt;Collection&lt;/tt&gt;:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;AutoGetCollection coll(...);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;WUOW();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;CollectionPtr writableCollection = CollectionWriter(..., coll);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;writableCollection-&amp;gt;invokeSomeDDLMethod();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;WUOW::commit();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="2257043">SERVER-73755</key>
            <summary>Potential reference to freed stack variables in AutoGetCollection::getWritableCollection</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>PM-2144-StorEx-Cleanup</label>
                    </labels>
                <created>Wed, 8 Feb 2023 13:34:14 +0000</created>
                <updated>Tue, 4 Jul 2023 14:12:27 +0000</updated>
                            <resolved>Tue, 4 Jul 2023 14:12:27 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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            <issuekey id="2295204">SERVER-75157</issuekey>
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