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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-66211] setFCV downgrade can overwrite the state for the latest txnNumber during internal transactions config.transactions entries removal</title>
                <link>https://jira.mongodb.org/browse/SERVER-66211</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58761&quot; title=&quot;[Upgrade/downgrade] Make setFCV delete the config.transactions entries for all child sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58761&quot;&gt;&lt;del&gt;SERVER-58761&lt;/del&gt;&lt;/a&gt;&#160;made setFVC do the following:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;For each session that has an internal session that executed retryable internal transactions for a command with txnNumber (i.e. as indicated by its lsid.txnNumber) greater or equal to the latest txnNumber in the parent session, update the config.transactions entry for the parent session to have txnNumber equal to that lsid.txnNumber and lastWriteOpTime equal to {t: 1, ts: Timestamp(1, 0)}.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;However, it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/32ea347de86eb649b5b1d196bbc4cb5411d1d26b/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L954&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;doesn&apos;t specify the &quot;txnNum&quot; field&lt;/a&gt; in the update query so if there is a new transaction or retryable write that starts and commits on the parent session between the write is issued by setFCV and when the write is applied, that write would end up overwriting the state for the latest txnNumber. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2039372">SERVER-66211</key>
            <summary>setFCV downgrade can overwrite the state for the latest txnNumber during internal transactions config.transactions entries removal</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 May 2022 14:15:26 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:37 +0000</updated>
                            <resolved>Wed, 4 May 2022 21:01:56 +0000</resolved>
                                                    <fixVersion>6.0.0-rc5</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4527030" author="xgen-internal-githook" created="Wed, 4 May 2022 21:00:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66211&quot; title=&quot;setFCV downgrade can overwrite the state for the latest txnNumber during internal transactions config.transactions entries removal&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66211&quot;&gt;&lt;del&gt;SERVER-66211&lt;/del&gt;&lt;/a&gt; setFCV downgrade can overwrite the state for the latest txnNumber during internal transactions config.transactions entries removal&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/248fa79fd395f335724cabd706428ef2cc1e2b84&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/248fa79fd395f335724cabd706428ef2cc1e2b84&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4526769" author="xgen-internal-githook" created="Wed, 4 May 2022 19:41:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66211&quot; title=&quot;setFCV downgrade can overwrite the state for the latest txnNumber during internal transactions config.transactions entries removal&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66211&quot;&gt;&lt;del&gt;SERVER-66211&lt;/del&gt;&lt;/a&gt; setFCV downgrade can overwrite the state for the latest txnNumber during internal transactions config.transactions entries removal&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/387a30c6a387ea31a114fa4a0140ad12fdfee85a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/387a30c6a387ea31a114fa4a0140ad12fdfee85a&lt;/a&gt;&lt;/p&gt;</comment>
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