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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-50018] lock order is reversed when updating config.transactions</title>
                <link>https://jira.mongodb.org/browse/SERVER-50018</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Operations that work on the config database would take the config db lock first and then the local db lock to write to the oplog. However, when updating config.transactions for retryable writes or transactions, the local lock is taken first and then followed by config. At first glance it may look like the logOp is taking the local lock &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.18/src/mongo/db/repl/oplog.cpp#L520&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;in this scope&lt;/a&gt;, but there are &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.18/src/mongo/db/concurrency/lock_state.cpp#L460&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;certain cases&lt;/a&gt;&#160;where unlock can be deferred until WUOW is finished. And the oplog write during retryable write or transactions falls into this case. In summary, what appeared to be a sequence of&#160;&lt;span class=&quot;error&quot;&gt;&amp;#91;lock local, unlock local, lock config, unlock config&amp;#93;&lt;/span&gt;&#160;is in fact,&#160;&lt;span class=&quot;error&quot;&gt;&amp;#91;lock local, (defer unlock local), lock config, unlock config, (unlock local for real)&amp;#93;&lt;/span&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1424734">SERVER-50018</key>
            <summary>lock order is reversed when updating config.transactions</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Jul 2020 13:53:47 +0000</created>
                <updated>Tue, 6 Dec 2022 02:13:43 +0000</updated>
                            <resolved>Thu, 6 Aug 2020 16:02:38 +0000</resolved>
                                    <version>3.6.18</version>
                                                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="3314255" author="renctan" created="Thu, 30 Jul 2020 17:24:37 +0000"  >&lt;p&gt;Mongo &amp;gt;&#160; v4.0.3 is not affected by this &lt;a href=&quot;#L476]&quot; target=&quot;_blank&quot; rel=&quot;noopener&quot;&gt;when using storage engine with doc level locking&lt;/a&gt; like WT.&lt;/p&gt;</comment>
                            <comment id="3314105" author="james.kovacs" created="Thu, 30 Jul 2020 16:23:01 +0000"  >&lt;p&gt;Since &lt;tt&gt;logOp&lt;/tt&gt; no longer takes a lock on &lt;tt&gt;local&lt;/tt&gt; in 4.0, is MongoDB 4.0+ affected by this deadlock?&lt;/p&gt;</comment>
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            <issuekey id="595229">SERVER-36883</issuekey>
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