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    <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-42922] failCommand + closeConnection can dereference a null session pointer</title>
                <link>https://jira.mongodb.org/browse/SERVER-42922</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The conditions evaluated to reach &lt;a href=&quot;https://github.com/mongodb/mongo/blob/abb1b353648260175c3dfe02ac8ae54c083956f7/src/mongo/db/service_entry_point_common.cpp#L569&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line&lt;/a&gt; are not sufficient to guarantee the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/abb1b353648260175c3dfe02ac8ae54c083956f7/src/mongo/db/client.h#L225&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;session object&lt;/a&gt; exists on the client (note the type definition: &lt;tt&gt;using SessionHandle = std::shared_ptr&amp;lt;Session&amp;gt;;&lt;/tt&gt;).&lt;/p&gt;

&lt;p&gt;Notably, the session may be null when using DBDirectClient such as inside the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/abb1b353648260175c3dfe02ac8ae54c083956f7/src/mongo/db/keys_collection_client_direct.cpp#L119-L120&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;KeysCollectionClientDirect&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="901351">SERVER-42922</key>
            <summary>failCommand + closeConnection can dereference a null session pointer</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Aug 2019 17:39:28 +0000</created>
                <updated>Wed, 9 Oct 2019 22:05:47 +0000</updated>
                            <resolved>Wed, 9 Oct 2019 22:05:47 +0000</resolved>
                                                                    <component>Internal Client</component>
                    <component>Internal Code</component>
                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2474782" author="jason.carey" created="Wed, 9 Oct 2019 22:05:47 +0000"  >&lt;p&gt;The fix in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43079&quot; title=&quot;failpoint triggered by LogicalSessionCacheRefresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43079&quot;&gt;&lt;del&gt;SERVER-43079&lt;/del&gt;&lt;/a&gt; also covers this use case.  As it avoids triggering the fail point for clients without transport sessions&lt;/p&gt;</comment>
                            <comment id="2379376" author="daniel.gottlieb@10gen.com" created="Tue, 20 Aug 2019 17:50:06 +0000"  >&lt;p&gt;Note that drivers use this failpoint extensively for testing. Their testing hits this on 4.0, though the reproducer will fire on master.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="887938">PYTHON-1948</issuekey>
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	&lt;li&gt;Initialize a replica set with test commands enabled&lt;/li&gt;
	&lt;li&gt;db.adminCommand({configureFailPoint: &quot;failCommand&quot;, mode: &quot;alwaysOn&quot;, data: {failCommands: &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;find&amp;quot;&amp;#93;&lt;/span&gt;, closeConnection: true}})&lt;/li&gt;
	&lt;li&gt;Wait for the HMAC monitoring periodic runner to execute (or issue a shutdown, which has the same effect)&lt;/li&gt;
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