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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-63978] Killing a child session should prevent checking out its parent</title>
                <link>https://jira.mongodb.org/browse/SERVER-63978</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a session is killed in the SessionCatalog, an internal counter is incremented to prevent the session from being checked out for a normal operation until the killer has checked it out. To check out a &quot;child&quot; session (a new concept introduced in PM-2210), the child&apos;s &quot;parent&quot; session must also be checked out, which is a separate session in the SessionCatalog. Killing the child only increments the child&apos;s counter, so nothing prevents the parent from getting checked out and blocking the killer from checking out the child, which can lead to a deadlock if the parent gets blocked like in the case of a replication state change, where all sessions are killed while the RSTL is held.&lt;/p&gt;

&lt;p&gt;Instead, killing a child should also prevent its parent from getting checked out until the killer has checked out the child.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1989911">SERVER-63978</key>
            <summary>Killing a child session should prevent checking out its parent</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Feb 2022 20:40:00 +0000</created>
                <updated>Sun, 29 Oct 2023 21:41:59 +0000</updated>
                            <resolved>Fri, 25 Feb 2022 22:16:54 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4378389" author="xgen-internal-githook" created="Fri, 25 Feb 2022 22:07:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63978&quot; title=&quot;Killing a child session should prevent checking out its parent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63978&quot;&gt;&lt;del&gt;SERVER-63978&lt;/del&gt;&lt;/a&gt; Killing a child session should prevent checking out its parent&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2a08e923539db20d79af032a27344a5990cee4a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2a08e923539db20d79af032a27344a5990cee4a4&lt;/a&gt;&lt;/p&gt;</comment>
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