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    <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-30852] Force reconfig that makes current primary unelectable can result in stepdown without taking the global lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-30852</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a primary learns of a new config via a heartbeat that came in via a force reconfig where it is no longer electable, it will transition itself to SECONDARY, but it does so without holding the global exclusive lock, which is illegal.&lt;/p&gt;</description>
                <environment></environment>
        <key id="420525">SERVER-30852</key>
            <summary>Force reconfig that makes current primary unelectable can result in stepdown without taking the global lock</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>todo_in_code</label>
                    </labels>
                <created>Fri, 25 Aug 2017 22:04:15 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:55 +0000</updated>
                            <resolved>Thu, 5 Oct 2017 22:51:43 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1690979" author="spencer" created="Thu, 5 Oct 2017 22:51:33 +0000"  >&lt;p&gt;Reading the code again it looks like we actually already handle this properly.  There are two possible reconfig paths, the reconfig command and learning of a new config via heartbeats.  The reconfig command takes the global X lock for every force reconfig &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ed31e32a74d942ef337ef507ad4628d224d65953/src/mongo/db/repl/replication_coordinator_impl.cpp#L2333&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.  Heartbeat reconfigs take the global X lock any time they are currently primary &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ed31e32a74d942ef337ef507ad4628d224d65953/src/mongo/db/repl/replication_coordinator_impl_heartbeat.cpp#L543&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.  So I actually don&apos;t think there&apos;s anything to do here.&lt;/p&gt;</comment>
                            <comment id="1657699" author="spencer" created="Fri, 25 Aug 2017 22:12:21 +0000"  >&lt;p&gt;When we fix this we should update the invariants in TopologyCoordinatorImpl::_setLeaderMode to prevent transitions from LeaderMode::kMaster to kNotLeader without first going through kSteppingDown or kAttemptingStepDown.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="369166">SERVER-28544</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="441420">SERVER-31431</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="881101">SERVER-42553</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="351022">SERVER-27892</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="935559">SERVER-43452</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="978497">SERVER-44205</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="981813">SERVER-44291</issuekey>
        </issuelink>
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